Can a Tesla Valve stop a MEGA TSUNAMI in Cities Skylines?

[@YouTube]

gaming but make it ✨ educational ✨

[@NukaCole7]

A youtube comment with no reply’s and 4 likes? Time to claim my spot. Hi youtube! Hello future repliers!

[@kaz2499]

Hmmm, the overlords.

[@Mistermat2HD]

Hello KZbin. Greetings from 2022.

[@dragameryt7221]

Yo wassup yt

[@AstronomerKSP]

Oh hi youtube! 3===========D~

[@AdamSmith-kq6ys]

A couple of points to note: Tesla valves aren't straight, they kink as they go along to force flow into one of the traps - you could model this by making one of the arms twice the length of the other and then alternating them; Also, Tesla valves are _one-way_ - should be perfectly feasible for the river to drain through the Tesla valve even while it stops the tsunami.

[@JoSSeSSRMBlues]

thought the same :D

[@England91]

@@JoSSeSSRMBlues also they need to be offset from each other

[@Th3BlackLotus]

Tesla valves are 2 way valves. One way allows for "free flow", when the flow is reversed, the pressure is reduced due to the design. It doesn't stop it completely, it just REALLY reduces it.

[@juanc1919]

i skipped through the entire vid because he did it wrong, we will wait until he does an actual tesla valve

[@meadj2]

I'd also be curious to know how much of the reduction in the current design is solely due to the first set of walls blocking/reflecting 2/3 of the initial wave. it's not really in the spirit of a "Tesla Valve" since it's not redirecting the water. merely blocking it like any other wall.

[@SamiO-w2j]

i love how nicola tesla created this amazing thing and here we are, making toasters that can imprint an image of whatever you want on your toast

[@amythistxue1]

yeah selfie toasters seem more like an Edison thing than a Tesla one

[@jonathan100yearsago]

Well....i love my toast with strongest shape imprinted on it...so it's a win

[@Aervial]

@@amythistxue1 edison stole his inventions

[@SamiO-w2j]

@@jonathan100yearsago ah ys, a fellow strongest shape supporter

[@Cyberdragunz]

Honestly, if it wasn't for Edison making Tesla's life a living hell, a lot more of Tesla's work would probably have come to fruition. A lot of it would have remained theoretical still I'm sure, but the man had a brilliant mind, and it's a shame much of his work was lost.

[@patconner2638]

Some minor pedantry: this design is a baffled suppressor, not a tesla valve. A tesla valve doesn't have any single straight line through the valve. Then again... I doubt this game's fluid sim could tell the difference. Excellent video either way

[@knobgobler2639]

its fluid through a canal rather than a tube anyway so the compressed fluid would mostly just make water level higher rather than a faster flow.

[@danielchan1668]

Maybe if we comment enough he'll redo this with a real Tesla valve.

[@mohammedalnayar]

Ikr?? I only pressed on the vid to see if anyone noticed xD

[@rrastetter]

My thoughts exactly

[@r0bz0rly]

don't care didn't ask

[@Bozemanjustin]

19:43 Tesla valves are offset so the water constantly fights. Why did you make yours completely symmetrical

[@XXX-XX-X-X]

Good in theory but it wouldn’t be a strong engineered structure, though. Needs to be shaped like a 🍆

[@lukitensen]

because that isn't a tesla valve, it's just cock and balls with "tesla valve" name on it

[@storminmormin14]

I think the way this game simulates this has much more in common with the wave dynamics of light. You should make a diffraction grating or double slit or some other optical thing to see what that does.

[@J4J0]

YESSSSS!!!

[@WouterVerbruggen]

Yeah the game doesnt seem to have any sort of viscosity or proper conservation of mass and momentum in it. Though maybe that doesn't matter at this scale, fluid physics is not my field

[@kerbodynamicx472]

Using the destructive interference of waves to stop a tsunami!

[@knobgobler2639]

The tesla valve involves fluids in a tube, a compressed space filled with water. In this trench the water can still be displaced upward so you should never get a significant increase in speed so long as the extra volume of water can be displaced. in other words you compressed horizontal space just to fill vertical space while if it were going through the actual valve, it would have no added area to be displaced to and thus go faster.

[@notsobreadd]

@@Call_Upon_YAH god ain’t real bro

[@OffGriDDD]

5:25 Flawless design. Absolutely flawless.

[@PlagueRichterian2]

FLAWLESS "hotdog" design

[@paulmuindiwilliam2945]

@@PlagueRichterian2 and he called the end the tip :)

[@Atlas-tv9jb]

The way I really thought he was being serious even though he does this every video 😭

[@HeyHeyHarmonicaLuke]

@@paulmuindiwilliam2945 6:50 he calls the passageway 'the shaft'

[@The-Slow-Dude]

Ikr

[@protoborg]

Each "lobe" of the valve should be offset from the next. Thus, the flow is forced to enter one of the lobes. The way you have it it is not forced to enter a lobe. The point at which the lobe feeds back into the main channel is the point at which the next lob branches off on the other side. So you have a series of V's that feed into U's that lead back into the main channel.

[@darrinjones9387]

I was going to suggest that.. offset the lobes

[@Justlookitupplease]

Same, I mean the offset valves are the magic of the whole thing.

[@hectorwillis9703]

Ahh yes lobes

[@Checkered_Everything]

@@hectorwillis9703 fillipian lobes

[@ivanaslan24]

Came to make the same complaint. This is not a Tesla valve lol

[@robertstryjak1973]

When RCE fools you for a moment with engineering talk before revealing he once again drew the strongest shape. I guess I really should have seen that coming.

[@timobensch3904]

yup, took me off guard I admit. I literally face palmed when I saw what he had done once again lmao

[@GummieI]

I mean at least from around 4:00 it was super obvious to me really what he was doing there

[@RealCivilEngineerGaming]

I'm glad some of you are still falling for it 😅

[@obijankenobi3162]

@@RealCivilEngineerGaming should have known better

[@CasperTheV]

The moment he made the tip I knew it was gonna happen

[@romanmorozov6974]

9:45 The formula A1 * v1 = A2 * v2 (for an incompressible fluid like water we can ignore density) works only in one directional motion. When the canal narrowed, if the only direction that the water can go is left, then yes your velocity would have increased. However, the water was able to move upwards, meaning your cross section area of the water flow pretty much didn’t change, which is why you see no change in velocity

[@c_n_b]

Thank you! 😊

[@ImpendingJoker]

Yep. Put a lid on it, to force a pressure increase in the louvers. The resulting compression would then slow the overall velocity of the wave.

[@alexsmith5047]

Exactly what I was thinking

[@cheeesesforsure]

Wouldn't you expect at least some increase of velocity through the open section since going up requires pressure against gravity?

[@Kepler444f]

@@cheeesesforsure Forgot that the game is 3D not 2D

[@blue13rain48]

That moment when he tries to engineer a tesla valve, but instead architects a tall wall.

[@JosejuanBlanco10]

No he accidentally made a suppressor for a gun

[@i.c.y.]

A tall male member at one point

[@bshinn4884]

@@JosejuanBlanco10 lol yeah he made baffles 🤣

[@BosonCollider]

In order to wrok, you need to make each step asymmetric. The one that takes the straight path must expand so that it travels more slowly, while the one that takes the bendy path must contract so it speeds up and makes it to the crossing point at roughly the same time

[@clashtwo5066]

For a not-Tesla-valve valve, it functioned exactly as expected.

[@jaden2790]

lol im not even an engineer and i realize that isn't a tesla valve. in fact its not a valve at all.

[@liamcooper6721]

Yes, I must say it performed as flawed as expected. Left a nice straight "red carpet" for the water to continue unimpeded. This "Engineer" has tarnished the great name of Nichola Tesla

[@yeetabix2752]

@@liamcooper6721 you mean Nikola Tesla? if you're gonna say he's tarnishing the name at least spell it correctly.

[@liamcooper6721]

@@yeetabix2752 Yep, fucked that right up didn't I... Can't believe I missed that when I typed it. Either way, its all a bit redundant now as he has made it properly in the new video

[@lufcwls]

He’s s civil engineer after all, cut him some slack.

[@DanielFSmith]

Regarding water flowing faster in narrower channels: Bernoulli's principle only applies to incompressible fluids. Your tidal wave is not height constrained, so the wavefront is highly compressible. You would have to fill in a rigid roof on the strongest shape and prevent it from expanding when the fluid gets excited.

[@coxmania1]

fina fuckingly someone is telling him this game is fucking 3D so the water just goes higher instead of going faster duh!

[@EmanLannehc]

but is that really the case though? even if this was a tubular system, wouldn't the excess pressure just push more water through the middle instead of accelerating the lateral waterflow? The only way I can see this work out, is because the waterflow in the middle gets slowed down because the diameter of the middle channel actually increases. contrary to that the sidestreams' diameter does not change after the point of entry. Thoughts?

[@NotCubes]

Given a incompressible fluid, which water is for the most part, and a rigid pipe, that's exactly the same. The water has a certain speed at a certain cross section, which means that the same volume flows through it every unit of time. That is called its volume flow (there is also mass flow, but our water here is incompressible, so it's the same in this model). That volume flow stays the same through the whole system, even if the diameter of the pipe gets smaller or bigger. Imagine a cylinder of water travelling through the pipe at its flow speed, the volume of the cylinder is the volume flow, and the height of the cylinder is equal to the speed. So if the cross section of the pipe gets smaller, the cylinder has to get longer to keep the volume the same. The speed of the water has increased. For a wider pipe it's the same principle, but it slows instead. The water is trying to push more water through the system, but the only way it can do this is by speeding up. Daniel here is correct, since the diameter of the water can change, it will just do that, and won't speed up or slow down. What was build here isn't a tesla valve, cause it won't work properly in an open system. It's more like a gun silencer, taking as much energy out of the wave a possible.

[@vincee7389]

Thought the same. Maybe he is an architect after all😳

[@cd14623]

@@NotCubesso fluid mechanics was my weakest class in undergrad, but does the fact that the tidal wave is essentially an impulse instead of a constant flow rate have anything to do with this? Like the water looks like it’s being simulated as a wall of point masses that is slowly losing velocity and getting deflected by the walls of the constriction instead of a liquid being compressed

[@steviousmusic]

I love how dramatic his intros are and how anticlimatic and funny the video afterwards is xD I never regret subbing

[@mito88]

5:24 you got balls

[@Mapping_stuffs]

Naw💀

[@TheTornStone]

Went to comments for a similar comment.

[@YoureBreathtaking]

And then the "tsunami" cums

[@tackytrooper]

I love how eager the cars are to drive into the water. Boss be like: "So you're still coming in, right?"

[@Yora21]

There are countless video collections of people slowly driving cars into water. Totally realistic.

[@Atheist7]

@@Yora21 fact checked: TRUE

[@rustyhowe3907]

True to life in every way imaginable.

[@parasharkchari]

This is very much the reality. I lived in Houston during Katrina, and the day that my area saw the worst flooding, my boss at the time (I was working at a small startup run by a colossal idiot) still called all of us and asked if we were thinking of coming into work.

[@Pierce1987]

Gotta make that money.

[@Mr.GameBoy69420]

5:23 - Yep, totally normal. Nothing suspicious going on here. 😂

[@Rooxon]

around 7:02 it gets even more weird.

[@nuclearkittenaz7513]

It is so sus

[@nuclearkittenaz7513]

Also look at this 7:38

[@sampyman3887]

fr

[@ryonhatcher4561]

I doubt it was intended to look this way. 🤣😂🤣😂

[@ThreeGuysOneBucket]

Skip to 17:53 for the test!

[@hashtagPoundsign]

Your tesla valve is too symmetrical, something an architect would design.

[@UnitSe7en]

It's even full of 60/40 angles. Typical architect.

[@bzipoli]

we got him boys

[@SpamSucker]

Nonsense… it is architects that shun symmetry, making engineers’ lives more miserable!

[@Kira_Laeloria]

@@SpamSucker this design of a "valve" makes everyone miserable, because its not an accurate Tesla Valve.

[@Democracyofficer-sleeper]

>:(

[@werd3426]

This video is enough proof of him being an engineer Is the contraption finished? Yes! Does it do everything as we intended? No.. Does it get the job done? Yes! Amazing!

[@josedan98]

I think the physics are actually correct, what you expect applies for sealed pipes, where a reduction in area increases the speed and reduces the pressure. In this case most of the water is at atmospheric pressure-ish, so we won't see the effect of dynamic forces. What we saw in the area reduction example was an increase in the head (height) of the wave, which can occur as there are no volume constraints.

[@MurdocK-BR]

That and also, he's expecting steady-state flow behavior in an unsteady flow simulation.

[@57thorns]

Yes, and we also saw a lot of reflected waves back, just as I suspected there would be. The water that "disappeared" was on its merry way back to the ocean.

[@DJsTeLF]

For what it's worth writing any comment online: what he said is correct according to Navier-Stokes equations for any fluid, any reduction in the area through which there is constant flux will result in an average velocity increase. The gradient of atmospheric pressure caused by gravity leads to a phase-change boundary. That's the top of the theoretical pipe. Conclusion stands; the water **would** speed up in real life. Yours truly, a physicist. Edited for clarity.

[@johonn]

@@DJsTeLF If you allow the height of the wave to increase, then is there really a reduction in the flux though?

[@57thorns]

@@DJsTeLF The problem of course is what situation those equations model. If you have a continuos flow rate, then (trivially) the speed will increase, regardless if we have on "open top" situation (where the fluid will rise before reaching a steady state) or a fully restricted pipe. But what happens when we have a "blob" of fluid moving, and it meets the resistance of the angled walls? The full body of the water will be subject to a net force opposite to the direction of movement (it is probably more relevant to speak of movement as this is not a steady flow). Some will be reflected back, some will continue forwards: It is not immediately obvious what speed the fluid getting through will have, or how much of it will get through, depending on the angle of the walls.

[@stonemeep4202]

I know that you probably won't see this but I've been going through a lot this year and my declining mental health isn't helping. I'm in college right now for engineering and I considered dropping out completely. But your videos have motivated me to keep pursuing to be an engineer and they also cheer me up by showing just how cool engineering can be. I just wanted to thank you.

[@lunaticbz3594]

If your mental health declines too much you could always consider becoming an architect.

[@MrSodetv]

Keep strong mate, every engineer (me too) considered dropping at least once, but is motivation that keeps us afloat. Always focus on what makes you happy, motivated, take your time and put mental health as your priority.

[@DPSVEGAS]

Don’t stress man! Be sure to take time to focus on yourself. Engineering courses are no joke and I fully relate to that stress you are feeling. I started out in ME but switched to ISE, I learned that I didn’t like ME as much as I thought/ the courses were just not interesting enough for me to be mentally engaged and happy. If you really feel like you are drowning in work/ without happiness, maybe consider changing your type of engineering to see what you feel fits best for you! Thankfully, there are tons of different types of engineering majors and pathways. Now that I’m graduated, had time to apply to companies, and get some real work experience; I learned most places/firms don’t really care what engineering major you had, they just wanna see that you can learn, problem solve with a team, and be personable.

[@protoborg]

Too bad RCE is not much of an engineer. If he were, he would know that in an open channel the velocity of the wave front is unaltered by narrowing the channel. Fluid dynamics like he is expecting only occur in a pipe or tube where the total volume must remain constant. Since the open channel allows the water to rise thus the increase in speed is transformed into increased depth.

[@NRosetheman]

@@protoborgIt doesn’t matter if RCE is an engineer or not

[@neamanja]

Imagine how well would a tesla valve work if he actually made it in the game

[@theNimboo]

Seriously pissed me off so much. Dude was just too lazy to make the real freaking valve. Instead he creates some abomination that he keeps calling the tesla valve but is really who the fuck knows what lol

[@Justlookitupplease]

@@theNimboo this man feels my pain

[@michaelallen2971]

@@Justlookitupplease lol

[@visassess8607]

@@theNimboo If this is enough to piss you off then you need to relax.

[@Vagabond820]

I was like, but theirs a clear central channel.

[@thatotherguy3756]

I was watching that thinking "oh yea thats cool, suport for 90° corners with pillers and I guess a round city is something you can do... oohhhh"

[@galactose_fructosemonosacc343]

Funnily enough, the valve shown in the beginning of this video looks exactly like vein valves. The flaps are there to prevent blood from flowing backwards

[@Alkis05]

vein valves have movable parts. Tesla valves are fixed. They are conceptually very different.

[@dhayes5143]

@@Alkis05 No Tesla valves were deployed in the making of this video. Galactose is right, these look pretty similar to vein valve, except for being entirely rigid. Moving 'parts' is a bit of a misnomer when every piece grows fluidly out of every other piece. x)

[@galactose_fructosemonosacc343]

@@Alkis05 well I didn't know that, I'm just sharing the knowledge I have from what I've seen at least

[@wobblyboost]

There is no human invention of use that did not directly copy nature.

[@Alkis05]

@@wobblyboost That is BS, unless you have a really general and vague definition of "copy", like saying a plane is just a 'copy' of a bird, which it is definitely not.

[@philips3825]

5:19 “bracing piers”…. then got me spitting coffee laughing. Ah thank you for that one

[@spazzmalone]

I saw hairy balls on a long schlong with a tsunami moving up the shaft at 6:55 ish.

[@adriankoch964]

Kinetic energy is stored in the bracing piers.

[@weswatson5340]

@@adriankoch964🛫✈️✈️✈️

[@xXxJSCOTTxXx]

I got kicked in the bracing piers once. They definitely absorbed the kinetic energy... 😢

[@BossdBs-o6p]

Bruh the bracing piers look like a penis

[@RealCivilEngineerGaming]

Get 10% off my entire merch store with code "tsunami" now!! www.realcivilengineer.store

[@JohnSmith-gv1fp]

[@TSF71]

Well done on getting into the trending area

[@that_weird_vtuber]

The valve is ment to be offset left and right to create more turbulence

[@dejank9508]

only 4 likes and 3 comments

[@ledorf]

Please read up on Tesla Valve and redo, this is not a Tesla Valve...

[@jpkjnn6733]

Sure doesn't look like a tesla valve.

[@J-storme]

Ur dumb

[@johnmiksa3568]

This dude just trolled us this whole video just to draw a weenier.

[@erumaayuuki]

I'm sorry to say it Matt. Although you're a great engineer, you kinda try to use 2D solutions in a 3D environment. A venturi will speed up the flow, but not if there is still other places for your fluid to go (like up)...

[@juanc1919]

that isnt what went wrong, he built the valve incorrectly.

[@erumaayuuki]

@@juanc1919 also, but I'm mainly talking about why the fluid didn't speed up

[@RealCivilEngineerGaming]

Even with open channels a narrower channel will increase flow velocity! But yes, Tesla Valves aren't meant to be open channels I agree there!

[@erumaayuuki]

@@RealCivilEngineerGaming Ah fair enough. But maybe not so much with tsunamis 😅

[@michaels.3709]

The 3rd dimension here isn't entirely unconstrained because the fluid is in a gravitational field. Because it takes additional work to push the fluid higher (as opposed to sideways, parallel to the surface), you'd see both an increase in height and an increase in velocity.

[@Blackraven6]

I think the main problem of this one is the fact that it's just too cramped. There should be that 180 degree turn. The whole point of Tesla valve is that you redirect waterflow without basically loosing the flow speed (well, as much as you can) and that redirected flow fighting the main flow slowing it down. I guess you understand it now judging by a small preview I see on the right of this commen.t

[@SetllaEdie]

Never regret. If it's good, it's wonderful. If it's bad, it's experience.

[@ChengTeoh]

So this is what happens to a certain part of the human body when it takes on too much water on a massive scale. Glad that you added the meatus.

[@EEEEEEEE]

‎‎‎‎‎‎‎‎‎E‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎

[@datechboi]

@@EEEEEEEE E

[@Herobrinegrn1]

@@EEEEEEEE EEEEEEEEEEEEEEEEEE

[@sperzieb00n]

makes me wonder how that design would do in timberborn, since its water simulation does seem to handle volume as well as velocity

[@cathygrandstaff1957]

Good question, could RCE save the Timberborners from a tsunami?

[@Tachy-yi9re]

This simulation is actually more accurate than his logic. The reason the velocity doesn't change is because it's a canal and not a pipe. Pressure becomes depth instead of velocity.

[@claytontaylor8212]

5:29 bro...

[@KenoattX]

Wow!

[@initiativeplaytherapy88]

😂

[@matthewwurtenberger1400]

I just started giggling

[@syrrix]

South Park level of map drawing!

[@fluxnoble]

That's a massive..... JOHNSON

[@Boredofmostofit]

So basically: Tesla invented the foundation for gun silencers? 😮

[@lostree1981]

Yes.

[@itsdabees]

It's slightly different dealing with expanding gasses versus flowing water, but the principles are essentially the same so I guess he kinda did.

[@Fo4assaultriflefan92]

No thats Milton reeves and Percy maxim

[@au51emu]

It would have been cool if he'd built a tesla valve

[@Retaferyr]

Exactly what I was thinking

[@imperfectclark]

he even shows the patent blueprint -- conspicuously different than his design. he wouldn't have needed such high walls.

[@gaussmanv2]

You can do this with either a maze or you have interlocking "teeth" coming off the wall to the middle. The teeth can be well spaced out and then put a bowl at the end. It'll speed the water up, but it drains a lot of pressure. Also, it would be cool if someone were to actually make a tsunami simulation game. You could probably do some simplified version of a CFD program. It won't be super accurate, but you're also not using it to sign off on a design.

[@llspeedup9930]

i want to do something like that but 2d. basicly you have a village in a river cause an achitect thought it would look good and you place defenses to defend.

[@relei]

7:40 no need to apologize, I was hoping you would do that

[@techoeastveld]

Bro I think my heart skipped a beat silently when you zoomed out of the finished landscaping 💀

[@joelmcloughlin5683]

The bracing piers were a nice touch I think there needs to be little bridges going in weird directions, like a veined network over the canals

[@ivar5021]

Thank you for this. I didn't want to be the only one.

[@atrumluminarium]

For the velocity to increase, your channel needs to have a "lid" to keep the maximum height constrained at a constant value. With varying height, the rate of fluid flow is still changing but it is doing so by a change in mass per unit length rather than by a change in velocity The game is actually simulating correctly I think

[@JiveHundred]

there shouldn't be a single large path down the middle, the valve should alternate channels and allow a single main ess-curved route

[@joshuacottenham9149]

While he's focused on the channel i cant help but notice the main flow is just running straight down the runnway instead of into the runways. I hope he find a better way to express this mechanism and makes a vid about it. Definitely can redeem himself

[@Dreddip]

As an engineer you'd think he'd want to recreate as accurately as possible. I'd say he missed a major design feature of directing the flow into the chute/channel of the next stage as in the Tesla design. I'm starting to think that he's an Architect playing an Engineer on YT 🤣

[@WatchMeWatchStuff]

Dude makes this whole video and then completely botches the actual shape of a tesla valve lol Still fun to watch

[@jarkkopolicarpio2965]

5:14 RCE: *Explaining engineering* Me: *Taking notes for college* RCE: *Reveals the strongest shape* Me: *Facepalms*

[@JoshuaNicoll]

There is a mod for the cities game that lets you use the edit level terrain tool settings in game, it has much more options and lets you change sea level, great water sources et cetera. It's called Extra Landscaping Tools

[@Mudboy44]

I can’t wait to aggressively explain a Tesla valve to my friends and family

[@OminousPinapple]

Well if you take this video as an example you'll be explaining it wrong

[@knobgobler2639]

@@OminousPinapple yes, first of all this is a canal and not a tube like how a tesla valve should be, so any compression of water is just gonna raise water level rather than speed water flow. Engineer needs to restudy his physics a bit.

[@xGolBLiiN]

@@knobgobler2639 The canal bit I’m totally fine with writing off as a limitation to the game, what OminousPineapple is likely pointing out is that design isn’t reminiscent of a Tesla valve at all. It shouldn’t have a straight open line down the center, the terrain should be interlocking to further impede the flow, the whole point is to disrupt the flow with every “section” or “loop” making the majority of the water flow into the loop rather than past it

[@daspec]

Now we need a time machine to take this design back to ATLANTIS

[@danialloganathan2803]

Would have been nice to have a second empty canal with no wall to compare the height of the tsumani

[@ddnava96]

Would have been nice to have a tesla valve

[@FireBeam]

I was gonna suggest a tesla valve! You're awesome! Edit: (watchs video) The symmetry you made is detrimental to the tesla valve. I know it's a natural inclination, but almost everything in nature that "works" is staggered, oscillates or is uneven. Simple example: put your 'symmetrical' feet side by side touching. Now, stagger them. They will fit together like puzzle pieces and take up less space. The tesla valve wasn't Tesla "dabbling" in fluid dynamics. It was him applying the same principles to different fields, and pointing to a possible Unified Field Theory.

[@kullen2042]

I'm not sure if the wavefront would actually slow down IRL, because the wave is not like a 2D-fluid or something. It can get bigger or lower which is not possible for 2D fluids (or confided 3d fluids for that matter). So I think that reducing the height of the wave is actually the more realistic way of reducing the energy of the wave. I wouldn't really expect the group velocity to change that much in this context. Perhaps in other words: As far as I understand, the tesla valve is primarily designed to stop a constant laminal flow. A tsunami however is a singular wave-packet, which is also not really confined to the tesla valve like a 2D fluid would be. So it still makes sense for the valve to reduce the wave packets energy, but for me it doesn't make intuitive sense to change the dispersion of the water waves and thereby change the velocity of the packet. (I would never expect a wave of lower energy to be slower, I would always expect it to have a lower amplitude.)

[@zeyogoat]

That's what I was thinking too: If unconstrained, the colliding transverse waves would merely superimpose (e.g. displace upwards) because they have the dimension to do so. Not having realistic fluid velocity dampened (heh) this simulation, but I was still entertained and learned something.

[@Aniaas1]

@@zeyogoat true but the water here isn't unconstrained - the fluid is subject to gravity, so you would expect some velocity increase because at some point it will be easier to go sideways than lift all the water above

[@DJsTeLF]

I dont have much more time or energy to comment so I'll just say this: you guys have written a lot of words without any references or mention of the pertinent mathematics. What Matt said is correct according to the Navier-Stokes equations. Yours sincerely, a physicist.

[@kullen2042]

@@DJsTeLF navier-stokes is usually for a hardly confined liquid. and i dont have much time either, so i just dumped my thougths instead of writing a thesis about it. sincerly, a fellow physicist.

[@ChristofferFlensburg]

Yep. The "narrow --> faster" principle comes from the fluid not being compressible, which is not true for this system. The wave pushed through a narrow gap just grows taller to carry the same amount of water through the gap at the same speed. It seems it propagates like a 2D wave, with reflections and the spherical waves out from the "point source" after the gap. So rather than modelling the game tsunami as a 2D fluid, it would probably be more accurately modeled as a 2D wave. Which is probably also more similar to how it'd behave in reality. I get a bit "hammer seeks nail" vibes from this: RCE knows a bit hydrodynamics, so he pretends the system follows hydrodynamics principles without really considering if his model actually applies.

[@patriotagainstcpsabuse1296]

Nice simulation but one thing I’d like to point out is that you left a straight channel down the middle while the Tesla valve has the curves offset to each other. That will create the most effective reversal of the flow for you. I would say try offsetting them and rerun the simulation. I can 99.9% guarantee you’ll stop the tsunami entirely and maybe reverse it. It should not make it past 2 or three of those curves. Just an observation hope it helps 👍🏻

[@hydroelectriclyre2775]

i think the water might have been programmed as effectively massless, behaving more like light wave interactions rather than matter interactions

[@knobgobler2639]

Nah, the dork just doesn't understand the difference between a channel and a tube. Compression in a channel will raise water level rather than speed it up. The wave changes are exactly what should happen.

[@MinkSquared]

one more thing, a tesla valve doesnt have a straight line, that would just compromise the effectiveness

[@gbornitz]

I believe, an important feature of the tesla valve is, that the water flows back into the main stream, blocking it. But in this case, the main wave was faster than the waves at the side, neglegting this advantage. So with an extra curve for the main wave in order to match the distance traveled by the second wave, this walve should become even more effective.

[@Ihat31di00ts]

6:54 "we have the tsunami going up the shaft..." Lmaoo bro wtf 😂😂😂

[@jakesnake5501]

This is why we keep civil engineers busy. This is what happens when they have too much time on their hands. But really, great video, Matt and team!

[@hpmc7426]

Now I’m wondering if my neighborhood actually looks like a tip/head.

[@zwren3693]

I’d love to see this again with the Tesla valve off-shoots staggered. I’d be willing to bet you could remove 1-2 of the valves (depending on the water physics).

[@dylanzrim3635]

And a diffuser at the opening to move the first wave to the outside a bit

[@jAfr0Thunder86]

I think if you off set the top and bottom parts of the valve with your flood walls and narrowed the long parts of the wall a bit, so they nearly overlapped, you could prevent the Tsunami from even exiting the second valve.

[@meson183]

A further adaptation would be this: instead of having a big wall all the way across the bay with just one Tesla valve channel, build a set of Tesla channels, all the way across the width of the bay. But closer to the ocean with more space behind for the city. The Tesla valve sea defenses thereby break up and dissipate the energy of the water before it reaches the city. THEN, you only need a very small wall in front of the city itself to ensure that it keeps the city perfectly dry. And that's only really needed due to the deficiencies of the game's water physics. It means the inhabitants get a good view of the ocean too, instead of one down a narrow channel (although it is a strong efficient channel). It also means the river can flow out of one of the channels, relatively unhindered.

[@DJsTeLF]

Nice idea, except when you consider the practicalities (==cost) of all that landscaping involved)

[@AliceErishech]

@@DJsTeLF I'm not sure practicality is a focus of this miniseries, lol.

[@朕是神]

Remidner that all those hydraulic theories (the ones you're thinking of, I think) and tesla valves are for when it's a tube that is filled all the way, without a vertical dimension for the fluid to go when pressure builds up. That's why the velocity isn't changed much; water surface wave group velocity is only roughly dependant on the depth, not wave amplitude or whatnot.

[@liamcooper6721]

something he never had to worry about with his "$1000's" software.

[@dylanladnier]

This is a fairly accurate depiction of a baffled suppressor. The tidal wave acts much the same as the gas expansion being slowed down in the geometries inside the tube. Interesting outcome as that wasn't the goal.

[@kevkev5935]

Was about to say the same thing as that was the first thing I saw as well. Laminar flow vs turbulent flow.

[@ashkebora7262]

Yeah, this is far more of a baffle system than a Tesla valve. It's really not a Tesla valve at all with a straight shot central path, IMO...

[@sleeman4629]

Thanks

[@RealCivilEngineerGaming]

Thank you!! Sorry it took so long to see this!

[@tygates4301]

As soon as he drew that curve I knew it was going to be the longest and strongest shaped valve

[@talinpeacy7222]

Bruh, he had a serious architect moment when making this video, kinda just imitating the rough shape without understanding the underlying concept and basically making something ineffective but nice and symmetrical

[@dimitrimorselli9506]

I think with a little offset in the openings in the valves it would have been even more effective

[@stevecntower]

19:00 Blender has some nice water simulations too

[@christopher2215]

Very similar to the designs of firearm suppressor baffles.

[@See_nn]

Went from water to guns

[@solared]

well, air is a fluid.

[@Jack_Wolfe]

15:33 There is a problem, you are trying to split the wave into three, as you split it, the the smaller path of least resistance, actually loose force so you need to split it into two with each entrance, this also helps water flow the opposite way easier. causing water eddies in the path of half of the water. Each valve is offset for maximum effect.

[@justicevanpool9025]

I thought the bleed off gully at the tip was a great idea for releaving physical stress. This area is particularly prone to building up fatigue so regular release would be necessary.

[@Robespierre-lI]

Very necessary

[@dperreno]

While the speed of water flow will change if it is going through a nozzle or diffuser, the speed of the waveform will not. This is because the water can simply go up, thus increasing the height of the wave. If your channels were contained (had a lid or roof), then the water speed would change according to the cross sectional area of the channel. But since there is no upper bound, the water just changes in depth instead.

[@chiryosaki5682]

I think you build more of a silencer than the Tesla valve 😅

[@SpamSucker]

The first time I saw a description of a Tesla valve, silencer (suppressor) was the very first application I envisioned! Bravo!

[@jans1982]

Physics of the game is right. The speed would be faster in a closed pipe. Some of the energy became kinectic and some became potential.

[@charlieinabox1164]

7:35 When you started the test this was all I could think of. "Come on RCE! how could you overlook that detail.... HE DELIVERS!"

[@ceasar8912]

Your bracing piers definitely deserved my like

[@hasangarmarudi2178]

Great experiment! And great effort as well, ty for the video! Also want to point out maybe tesla valves are more effective against a constant flow of water rather than an impulse ( or vice versa, idk actually) that would be a good addition to this experiment, maybe a short video?

[@cheshire1]

"I'll have to let the channel open so the water can flow out, annoyingly" * proceeds to build a tesla valve, which is literally designed to let water flow in one direction but not the other * * doesn't put it on the channel *

[@CyberKnightX21]

It's really interesting how this turned out, however the offset of the right and left sides of the Tesla valve was missed in the design. I'm curious how that would have affected the water in this. I know in real world physics that adds to the amount of flow reduction, but how would it have gone in the game?

[@liamcooper6721]

it wouldn't work as intended because a Tesla valve is a closed system. As modelled in the game it is open topped thereby not allowing the fluid to change velocities. Not to mention it's also modelled horribly wrong from the blueprint.

[@Webberjo]

18:13 You said the water will be forced to move faster through the narrow gaps compared to the wider gaps, but the water appears to be moving at the same speed through both of them.

[@WelziFC7]

I like to think the creators of cities skylines see these videos and just think “we’ve got to fix that for next time”

[@brianwoodbridge88]

5:19 “bracing piers” saw it coming, still laughed 😂

[@jjtimothy9057]

5:24 he even left an opening at the end of the “valve”😂

[@nolankuffner3573]

I feel like, instead of a third being the gap here, to account for the less realistic wave flow physics, going to a quarter (even 28%) would be sufficient to prevent the water from reaching the city. The larger curves to the valves should also prevent the overspill, which, while not rebounding as fast as in real life, still adds enough reverberation to limit the wave's flow. Definitely an interesting experiment, and a credit to the game designers for this being even remotely quantifiable.

[@jacobcarlson4010]

Stevo: This is going to be another of those “hold my beer and watch this” moments, isn’t it? Me: Oh, you betcha.

[@deltacx1059]

Just imagine how well it would work if you staggered the pockets and narrowed the gap

[@abhishekmohapatra6617]

You could have rounded the base of the shaft, instead of rectangulr edges, that would cause less of a splash and you could have gotten a more powerful tsunami.

[@patrickshaw411]

Imagining the guy on the dev team who’s whole job was water physics watching this video. You probably made his day!

[@Baer1990]

15:45 I think it works better in cities skyline because it behaves as 3 backwards valves you made before, and not as much as the intended way. But still a great video

[@fishrsa9046]

9:30 -technically the game isn't wrong here- ok it's not 100% correct but also not 100% wrong :D - the reason water speeds up when a pipe has a constriction is because it has to to keep the same volume of water per unit of time(litres per minute, or whatever). the game still keeps the same volume per time by piling more water vertically as there is no way to restrict the flow on the vertical axis

[@cosmic5486]

Pro tip:if someone made a Tesla valve with that kind of walls The velocity of the tsunami would be too strong and break through those walls

[@side-fish]

I think the issue here is that the fluid mechanics you mention work when the channel is pressurized, but because this is an open channel, the waves won't speed up as flow rate of the channel is still the same (the waves increased in height). And while the Tesla valve worked, I think it's not because of the principles of mentioned. The water backflowed into the ocean, which wouldn't be if the channel was pressurized. Personally, I think it was just because there was far less water that came out of it. But this was an interesting experiment indeed. Mildly satisfying to watch.

[@laurenceperkins7468]

The ramps leading up to the tunnel are probably a cost calculation. Your walls get thinner toward the top, so it's probably finding the breakover point between the expense of the tunnel distance vs the expense of the height of the ramp.

[@NateJGardner]

RCE: "I don't think you'd ever be able to get a game to run this in real time" Two Minute Papers: "Hold my coffee"

[@hercules1494]

Elon says he loves Edison, so he uses name tesla for marketing. Pretty architect move in my opinion.

[@brianargo4595]

I mean, he is a modern Edison. His only (nominal) skill is marketing, he just exploits other more innovative people and claims credit

[@thatwaffleguy4958]

@@brianargo4595 Very Architect indeed.

[@TeiuAl]

You have my subscription for the simple fact that you chose the Tesla valve as the theme of this video

[@JesusCheeseburger]

5:04 "One thing I wanna do, just because I'm an engineer." Oh, we know what you're "engineering" all right.

[@psi9000]

RCE, ty for the hard work you do in your IRL job, as well as the work you do making videos and maintaining your channel! You’re a real inspiration of dedication!

[@danr6716]

I don't think he still does the job anymore, he always mentioned "I use to"

[@danr6716]

@@Lofi.z34 watch a few videos especially infra ones and he always says "this use to be my job" or "I use to do this for my job"

[@danr6716]

@@Lofi.z34 also, you drive a Nissan so you are already irrelevant

[@Mimi.1001]

I believe since his videos really went off, which was a few weeks after Mini Motorways released, he quit his job to focus on the channel.

[@psi9000]

Ty everyone above that information, that’s great news! He’s so successful at his passion that he is able to make it his new career, that’s the best thing ever!

[@Grey-the-gandalf]

The main reason why the wave isn't high is still that the town is a lot higher than the ocean - so the Tsunami starts alot deeper xD

[@LayneBenofsky]

right -- if the incline weren't also a factor, the valve might have a chance to do more good! :D

[@RennieAsh]

With this setup you need a fork diversion (or single) after the "tesla valve"