FluidX3D - A New Era of Computational Fluid Dynamics

[@ChrisDaGamer]

I just tested this on my 4 year old midrange pc ( GTX 1660 Super GPU, using the river demo shown here ) and it ran in near real time! ( like 15fps, I wasn't keeping track ) I cant even begin to imagine how much effort it takes to have a entire fluid simulation run at a interactive speed, well done man! Also your documentation is excellent, I got it up and running in less than 5 minutes. ( ps: If I can figure out how to make my own fluid sims, I'm almost certainly going to use this more than just this one time. )

[@GuagoFruit]

Here we see excellent visualisations murdered by youtube bitrate.

[@willies545]

watch it in 2160p

[@GuagoFruit]

@@willies545 Didn't help. eg at the start you can see the colour on the nose is super blocky. Only the water simulation parts were decent, so much quality is lost in the other flow visualisations.

[@ProjectPhysX]

@@GuagoFruit on LinkedIn/Twitter it just looks like a smeared mess. Their video compression is even worse.

[@a2e5]

@@GuagoFruit saturated colormaps are not exactly friendly to video compressors designed with more "natural" stuff in mind. the chroma subsampling and other ways to differently weigh luma vs chroma absolutely hate these stuff. the high amount of particle motion isn't great either, but considering it worked okay-ish on less colored water bits it's probably mostly due to the color.

[@brunoaraujoespin]

relatable

[@LinkyTea]

I cant imagine how long and tedious it took to write your own program for these visualizations! I know almost nothing about physics or science, but I know from experience coding is a very complicated process and this is absolutely impressive!

[@wariacix750]

probably like 10 minutes if by minutes you mean years ofc

[@krimouAAA]

it exists all sorts of softwares ready to get the job done. you need to know how to enter your data into these softwares. a software to draw the geometry of the case to study, a software to mesh the geometry, a software to enter physical data like temperature, pressure, viscosity of the fluid ..., a software to do computations to get results and a software to visualize the results. what you are seeing how a software displays the results in a finite number of cells at a certain amount of timesteps or a successive groups of results that are displayed continuously.

[@LinkyTea]

wow, sounds cool but very intricate!@@krimouAAA

[@ahmadfebriansyah]

The majority of computer students do not understand 100% coding

[@ProjectPhysX]

@@LinkyTea I've been working on FluidX3D for 6 years and 7 months - but only on my weekends and evenings. Got a working prototype in the first 3 months, and since then optimizations, extension modules, bug fixes, refactoring, exploration of faster algorithms, using the software a tool for my PhD. In early 2022 I did a complete rewrite, starting from the ground up once more, but with all the knowledge from previous failed attempts, and fully refactored code. 6 months later I put it on GitHub. And for the last 2 years: multi-GPU support, doubling down on my zero-bug policy by fixing literally all remaining bugs, improving usability based on feedback, ensuring compatibility on new hardware, adding full interactive graphics support on Linux, improved visualization kernels, future-proofing for hardware with multi-TeraByte memory capacity. Good software doesn't pop up over night. It's assembling a puzzle one piece at a time, building on top of what you did yesterday, solving ever new problems. Sometimes you find 3 old algorithms that others had invented long time ago, and put them together and out comes what feels like black magic. It's also thinking through what users are gonna do with it and making that as easy as possible, and making sure it's robust and works even in the weirdest edge cases.

[@ProjectPhysX]

Updated the channel trailer! Yes yes tutorials are coming soon™, be patient! UPDATE: I have added the documentation / user manual on GitHub: github.com/ProjectPhysX/FluidX3D/blob/master/DOCUMENTATION.md

[@_John_P]

Is it possible to simulate fire?

[@NUCLEARARMAMENT]

thanks again for the amazing content!

[@ProjectPhysX]

@@_John_P no chemical reactions unfortunately. But thermal convection is possible.

[@_John_P]

@@ProjectPhysX And what about the emissivity of the flame?

[@TheDarkrider551]

Very excited for when they do come out!

[@lucamagni99]

Fantastic! One of the projects that I follow with more interest!

[@bartekburmistrz8679]

Thank you, it's the work of people like you that inspire and helps with young passionate people that later become field leaders, often times pushing science to it's very limits and thank you, from me as a person as I will now attempt to run a CFD simulation of a crab because no one can stop me now

[@zipped1214]

As an aerospace engineering student this is absolutely incredible, thank you for making this

[@davidebic]

Can't wait to take my partial differential equations course next semester when looking at this.

[@monkeeseemonkeedoo3745]

Thank you for making your work available like this! I'm sure it will inspire a lot of people

[@thomasgoodwin2648]

Don't know about anyone else.... but I'm Navier-STOKED!

[@getsideways7257]

Same. Now let's see ourselves out :)

[@TheArchCoder]

Nice pun lol

[@justenergy1724]

That is insane! Very relaxing :D

[@ChipboardDev]

Great work!

[@claude7473]

YEsss looks very nice, will try it ASAP.

[@wilhelmwimmer942]

Thx for the wonderful toolkit!

[@leonard9636]

This is insane ! Insane !!

[@Unique-Concepts]

😮😮, master piece

[@annraven749]

And this, ladies and gentlemen, is how real scientists flex!

[@MatthewHelms-q4l]

Bummer to see such a high quality product demo RUINED by KZbin compression! Great work can't wait to try myself

[@pawelczubinski6413]

that looks awesome

[@quillmaurer6563]

Awesome! I've been looking for accessible CFD for a long time. Have a lot of CAD experience but not much CFD - how easy is this to learn? Does it only output flow visualization, or can it also provide useful numbers for an engineering context like drag and lift forces? For many years I've wanted to evaluate configurations of spoilers or air deflectors on my classic Volkswagen Beetle to try to improve fuel economy, CFD probably wouldn't be the end-all answer but could be a really useful and interesting tool alongside real-world testing (yarn tufts, pressure sensors, and coast-down). Basically combine this with all of Julian Edgar's videos on car aerodynamics.

[@MonsterJuiced]

Wow you are very generous to do this. When you started GPU programming, how long did it take you to reach this moment of release?

[@ProjectPhysX]

I started programming in 2014, and OpenCL GPU programming in 2016. It's been 7 years already!

[@MonsterJuiced]

@ProjectPhysX my god, wow. I'm astonished at your accomplishment here. It's a shame the industry didn't have the tools there for you already. A lot of these things, like FLIP fluid sims all tend to be CPU focused for some reason. It would surely be a good thing if this tool could be implemented into blender3d for example and game engines since it's GPU and efficiency focused.

[@dejgo351]

0:37 Starship!

[@herrkunde6941]

This is really cool! It almost looks like DNS. Are there any plans to incorporate an energy distribution to model heat transfer problems, for example?

[@ProjectPhysX]

It is almost DNS (DNS-LES). Pure DNS for super large Reynolds number is still out of reach even for the largest supercomputers. Thermal convection flows are already possible with one of the extensions. See here for an example: kzbin.info/www/bejne/onXWq2WjlsaNe9E

[@herrkunde6941]

@@ProjectPhysX In real time even! Incorporating volume forces like gravity seems pretty daunting... I would be really grateful for some tips: I am trying to implement a 2D thermal LBM in Python using the JAX library, with the hope of later getting sensitivities that i can use to optimize a simple 2D heat exchanger geometry. Do you think it is possible to mask a solid part of the domain so that only heat conduction is modeled via LBM there, without resorting to a second model?

[@ProjectPhysX]

@@herrkunde6941 I'm not sure how well thermal LBM is suitable für solids, or if a second model is required. There has to be a solution for this in literature already, especially for heat exchanger simulations. Let me know if you find something!

[@herrkunde6941]

@@ProjectPhysX I found something! You basically just define the relaxation time locally for the fluid and the solid, and set the velocity in the solid to 0, nothing else necessary. It gives pretty accurate results too.

[@bryangohmppac6417]

@@ProjectPhysXregarding the thermal convection simulation, how do you calculate the Nusselt number? Do you calculate it directly by the normal derivative or is there any specific formula in general such as the momentum exchange algorithm to calculate lift and drag force

[@MarieAmeliaFreyaAster]

Holy shit, congratz

[@boatingcow]

Amazing work! I wonder if you (or anyone else) already made a precompiled version, (preferably for Windows) for those of us not so comfortable with C++?

[@ProjectPhysX]

The simulations setups are written directly in C++, which gives the full C++ feature set for automation of simulation rows and data evaluation, without cumbersome interpretation of a separate script language and having to write huge raw data files to the hard drive. The flipside of this is that the code has to be re-compiled for each new setup, so a pre-compiled version does not make sense apart from benchmarks. I've thought about a precompiled version many times, but always concluded it's not worth the large effort of adding script translation, for in the end much worse options to design complicated setups with embedded data evaluation. Since I didn't use any large external libraries, compiling is very quick - about 5 seconds for the entire code - and I've doubled down on the C++ option. I made compiling as simple as possible: github.com/ProjectPhysX/FluidX3D/blob/master/DOCUMENTATION.md#2-compiling-the-source-code So unfortualately there is no way around learning some C++. The basics are enough though, you don't need fancy stuff like inheritance, standard library, templates or whatever. I can only recommend learning C++, it's a very fast language and might even be beneficial to your future career!

[@boatingcow]

Thanks for the explanation. I’m familiar with C myself, so reading up on C++ shouldn’t be too much of a stretch. It would be great to see this one day with a precompiled UI and an embedded JIT compiler for the user code, then it might be possible to deliver as a plugin perhaps like the Grasshopper/Rhino3D workflow. Again, great work!

[@Blingchachink]

Thank you

[@bexiexz]

so cool!

[@Cullol]

Brul you done a lot of things forreal. I don't understand much,i only know a little bit of GLSL. But nice to see what could be done with the most powerful GPU's in the world.

[@MenkoDany]

Beautiful intro!

[@matteopiccioni196]

Very very interesting. But from what I know about LBM scheme is that is not suitable for unstructured grid, how did you manage to apply LBM to this model? What kind of mesh did you use here

[@ProjectPhysX]

I'm using a Cartesian grid too, only with super high resolution, billions of cells. The conversion from triangle meshes (.stl files) to cubic grid cells works with a fast solid voxelization algorithm on GPU.

[@matteopiccioni196]

@@ProjectPhysX absurd and wonderful, I know the voxelization algorithm, I think it is used in blender too for immages rendering purposes.

[@qianxinxu]

It's amazing! l want to do what you have done one day.

[@Muzzino]

Crazy!

[@wiserdivisor]

Please share a megalink (or any other storage solution) of the original uncompressed video!

[@ProjectPhysX]

Is there a free platform for such large files? Playing back the uncompressed videos crashes my gaming PC; 4K60 bitrate is about 750 Mbit/s.

[@wiserdivisor]

@@ProjectPhysX Sounds like it'll need to be torrented, but then again if it's a 100 GB for each second of video, it'll be too big to download ! And if your gaming PC falls into a coma just trying to run it, I can't imagine how my little Dell laptop will survive such an ordeal. Anyway, cool video Dr. Lehmann. You make me want to study CFD :)

[@GatewaySpace]

Do you think we could all start using this in the near future? Could it be ported as a water simulation add-on for Blender? That would be INSANE, you'd get a ton of attention!

[@ProjectPhysX]

You can use the software right now, it's on GitHub: github.com/ProjectPhysX/FluidX3D No Blender addon unfortunately; it's a standalone software with rendering embedded in OpenCL. Data export for Blender rendering would slow it down *a lot*.

[@GatewaySpace]

@@ProjectPhysX does it work on MacOS if I compile it?

[@ProjectPhysX]

@@GatewaySpace yes! Change the compile script here for macOS: github.com/ProjectPhysX/FluidX3D/blob/master/make.sh#L9

[@GatewaySpace]

@@ProjectPhysX thanks! Last question, how do you go about actually rendering the simulations? Can the cache be exported and imported into, say, Blender?

[@ProjectPhysX]

@@GatewaySpace I use my own rendering engine, written in OpenCL. This way I can pause the simulation, render a frame directly from VRAM and store it on the hard drive, and continue the simulation. No data movement happens except rendered frames.

[@MrZwulch]

I miss the aerodynamics of a cow simulation in this trailer:(

[@InternetListener]

In fact the cow it's mathematically speaking like an sphere and phisicists should know that real fluid drops tend to be spherical because of the surface tension is stronger force than air drag resistance, so in 0:45 you're just seeing a falling cow taking a bath.

[@CornisPopped]

This is amazing! What would you recommend to a new hobbyist on making a simple 2D CFD program?

[@ProjectPhysX]

In terms of writing such a program yourself? I can recommend C++, it's difficult to learn but the payoff is huge! And for numerical methods, Lattice Boltzmann is actually quite simple, you can implement it in 100 lines.

[@laziokhadka7377]

Awesome can you do tutorial about loading Stl file ,setting boundary conditions and post process result

[@ProjectPhysX]

Loading stl files: github.com/ProjectPhysX/FluidX3D/blob/master/DOCUMENTATION.md#loading-stl-files Boundary conditions: github.com/ProjectPhysX/FluidX3D/blob/master/DOCUMENTATION.md#initial-and-boundary-conditions Video rendering: github.com/ProjectPhysX/FluidX3D/blob/master/DOCUMENTATION.md#video-rendering

[@deutchecheems7678]

I know that as soon as I open such an image on the PC it explodes... Imagine doing something like that

[@ashamefulgamer1578]

Borno is gon look craaaaazy now

[@JJose-22]

Hi im working on some voxelised models or voxel based models that i would like to run fluid flow and heat exchange simulations on, does Fluidx3d work with openvdb?

[@ProjectPhysX]

OpenVDB is not supported, but you can load triangle meshes from binary .stl files, and FluidX3D will voxelize them. If you're experienced in coding, you can add a load function for OpenVDB format into the code yourself!

[@bakersbread104]

That's insane. Your able to do this so quickly because its running on a gpu? Why are gpu's so much better than cpus? Or is the LBM just much cheaper to solve compared to Navier-stokes stuff?

[@ProjectPhysX]

The key is the combination of the LBM algorithm/solver running on GPUs. LBM is an alternative equivalent formulation of Navier-Stokes that allows to explicitly compute the next time step for each grid cell independently. No matrix equation has to be inverted and solved, like with more traditional FVM Navier-Stokes solvers. LBM just loads some numbers from VRAM, does very little computation (BGK collision operator), and writes the numbers back to memory in swapped locations (streaming). GPUs can do this so much faster because their memory bandwidth is ~10x faster than that of CPUs, and on top they only have a shallower [registers, L1 cache, L2, VRAM] memory hierarchy instead of [registers, L1, L2, L3, RAM]. This makes it even faster as LBM plows over all of memory in every time step and caches are only an obstacle in this case. In the past LBM has not been popular though, because it's memory footprint of ~344 Bytes/cell meant you could only do 3 Million cells per GB of VRAM - and GPUs maxed out at 2-4GB. Such small simulations were insufficient for real world use cases. In my PhD I found two optimizations to reduce memory footprint to 55 Bytes/cell without reduction of overall accuracy, allowing 19 Million cells per GB. And today GPUs typically have 8-24GB, going up to 192GB on data-center. That's 150M cells already on cheap 8GB cards and 3.6 Billion cells on 192GB MI300X/B100. Details here: github.com/ProjectPhysX/FluidX3D#vram-footprint The last trick is that I implemented multi-GPU, allowing to pool VRAM of as many GPUs together as are installed in a PC/server. That allows for cheap builds like 4x P40, for 96GB VRAM for $700, or super large simulations on big expensive GPU servers. It's even possible to "SLI" different AMD/Intel/Nvidia GPUs together, as long as they have similar VRAM capacity and bandwidth. Details: github.com/ProjectPhysX/FluidX3D#multi-GPU

[@bakersbread104]

@@ProjectPhysXso follow-up question. A guy in my lab was just showing us stuff on how he’s trying to reduce writing time by doing this or that with probes and such. Can you tell me about the details of writing all this data to memory? I assume that is included in the time you mention because no way you’re saving all these billions point snapshots on vram right? Do you just use ssd’s or something or how do you have some special writing considerations?

[@Blue-op6qv]

Yoo, the software is amazing, how do you manage to record/save the fluids results tho?

[@ProjectPhysX]

Either as rendered video frames (managable amount of data, in the order of 10GB of image files for a video), or by storing the volumetric data as binary .vtk files to the hard drive (but then a single frame can be 120GB, which becomes difficult to handle).

[@Blue-op6qv]

@@ProjectPhysX thank you!! legend

[@Givan-]

How did I see the X-Wing coming

[@gilofe5500]

Do you put some rotating type boundary condition for the wheels of the f1 car?

[@ProjectPhysX]

@@gilofe5500 yes

[@holthuizenoemoet591]

Amazing to see how cross platform this is, how did you get your hands on those AMD MI200 GPUs?

[@ProjectPhysX]

I asked at Jülich Supercomputing Centre and they granted me access :)

[@jmd1743]

I've been kicking the can of the concept of mine that involves a server case that's mean to water cooling. The kicker would be a narrow air intake "slot" that goes from the left to the right side of the front panel of the case. The idea is that air would be pulled into the case with the air making a 90 degree turn to be pulled through PC liquid cooling radiators before making another 90 degree turn to be ejected out of the rear of the case. I want compare the airflow of my concept to say simply bolting the radiator & it's fans onto the front panel of the case. I'll be sure to look into your software.

[@nutzeeer]

this is open source?? awesome!

[@ProjectPhysX]

No, it's source-available for no-cost non-commercial use. Like open-source, the source code is available and it's free of charge to use/modify/redistribute, but commercial and military use are not allowed. This restriction in usage (forbidding commercial/military applications) is not conform with the "open-source" definition, and "source-available" is the correct technical term.

[@dorianvincent2101]

@@ProjectPhysX it makes me think about something, does it mean that we can use it to build a racing car to show on youtube ? (Not for racing in categories, just racing for fun!)

[@ProjectPhysX]

@@dorianvincent2101 yes, use for such hobby projects is ok!

[@dorianvincent2101]

@@ProjectPhysX awesome! :)

[@MackeswellAnimates]

Now we’ll finally be able to calculate the aerodynamics of a cow

[@jorbedo]

Dr. Lehman, it is possible to change the Q-criterion isosurface opacity to different transparency levels?, I would like to superimpose or to compose everything with different levels of transparency in premiere. For future updates it is possible to slice the Q-criterion isosurface (To add a Boolean box inside the volume?). I tried @SLGY helicopter STL animation but I got many errors (The github discussion: Moving objects and interaction with airflow #42, any revisions to that?) TIA.

[@ProjectPhysX]

With a small code modification, you can make the background of exported images transparent for later overlay in video editing software: github.com/ProjectPhysX/FluidX3D/issues/24 I'm currently also experimenting with semi-transparent rendering. This is difficult, because the order in which grid cells are drawn is moreless random. But I think I have figured out order independent transparency today...

[@jorbedo]

@@ProjectPhysX Got it, thanks, I will try it.

[@supergreatsuper]

Do you have any recommendations for where to learn GPU programming? Ideally for scripts I can run on my personal computer (more general answers also appreciated).

[@ProjectPhysX]

Start here: github.com/ProjectPhysX/OpenCL-Wrapper

[@supergreatsuper]

@@ProjectPhysX Thanks!

[@keanamrazek3745]

How do you guys do these renderings of the results? Looks incredible!

[@ProjectPhysX]

With my own rendering engine implemented in OpenCL. Source code is in the GitHub repository: github.com/ProjectPhysX/FluidX3D/blob/master/src/kernel.cpp PS: It's just me, I wrote this software solo ;)

[@keanamrazek3745]

@@ProjectPhysX you legend🥳thank you!!

[@jorbedo]

@@ProjectPhysX Thank you CFD Sensei

[@jorbedo]

@@ProjectPhysX Dr. how to render the object as a solid instead of wireframe, possible to change object color? Any option to add vertex shading to the object to capture the pressures around it? Thanks a lot for your time!

[@ProjectPhysX]

@@jorbedo block-comment from here with /* github.com/ProjectPhysX/FluidX3D/blob/master/src/kernel.cpp#L2263 and uncomment the block here by removing /* github.com/ProjectPhysX/FluidX3D/blob/master/src/kernel.cpp#L2332

[@compassft]

I have read this is a cfd solver based on the lattice boltzmann method...I am not very expert....can it be used to simulate free surfaces, multiphase, etc..or is it valid only for 1 medium flows? Thank you

[@ProjectPhysX]

It can only do single-phase, with optionally free-surface. Free-surface simulations only simulate the liquid phase, not the gas phase.

[@SB3_01]

How accurate is this CFD code to real life experiments ?

[@ProjectPhysX]

As accurate as it gets with CFD. See some validation setups here: www.researchgate.net/publication/362275548_Accuracy_and_performance_of_the_lattice_Boltzmann_method_with_64-bit_32-bit_and_customized_16-bit_number_formats

[@JustinKoenigSilica]

can it do MRF and multiple liquid phases (i.e. oil and water)?

[@ProjectPhysX]

@@JustinKoenigSilica no, it's single-phase only, but with optional free surface extension (where only the liquid phase + surface tension are modeled and gas phase is ignored).

[@ericshin121]

Nature: Look what they (computers) need just to mimic a fraction of my power

[@emeneensj445]

What exactly is this? Is it better, similar or different then sims like ember gen and Houdini? And how come in the water sim the water dips unnaturally? Also can this work for film? Like can you make it look realistic and implement in blender or something? And if so, is this free or paid for? Either way, I think many would pay for this software

[@ProjectPhysX]

It's a physically accurate computational fluid dynamics software for science/engineering applications, with integrated real-time rendering capabilities. The solver is >100x faster than commercial CFD software, and even significantly faster than all of the inaccurate VFX solvers like EmberGen/Houdini. It's a standalone software, so there is no blender integration. And it's free for non-commercial use in science/education/hobby, with the source code published on GitHub ("source-available no-cost non-commercial" license). Not "open-source" though, as commercial/military use isn't allowed by the license. I will eventually also open it up to (paid) commercial use with a 2nd commercial license, targeted towards companies.

[@jorbedo]

He bypass the creation of Terabytes of data and IO transfers to render on external applications, to be able to share it with 3d apps he could loose the realtime ability. Maybe this not the solution that you are looking for.

[@emeneensj445]

@@ProjectPhysX I don’t expect you to have an answer, but is there any physically accurate vfx water sim? Maybe real flow? Or any program able to achieve it? (that you know of)

[@Sridhar-k8b]

Is there any way to run openFoam likewise

[@ProjectPhysX]

@@Sridhar-k8b OpenFOAM is great in it's own way, but it is not a tool that can handle such very fine grid resolutions. Runtime and memory footprint will just blow up.

[@Sridhar-k8b]

@@ProjectPhysX But i can see many of the official sim softwares using them i guess under the hood even though running fine meshes. Are you saying openfoam is only good for small-mid scale sim ?

[@Loogys]

What kind of computer do you use? Laptop or a PC or Mac?

[@ProjectPhysX]

I started this project with a Windows 10 laptop (Lenovo Y50-70, i7-4720HQ, 16GB RAM, GTX 960M 4GB). Since 2018 I'm mostly using a Windows 10 PC (i7-8700K, 16GB RAM, Titan Xp 12GB). Still plenty fast, so I won't upgrade hardware anytime soon. But I'm planning to switch to Linux; can't have the OS take up >3GB RAM on idle and bombard me with ads.

[@ThalassicOddity]

omg this is crazy.

[@sunoncream1118]

tutorial to instal somewhere?

[@ProjectPhysX]

Here you go! github.com/ProjectPhysX/FluidX3D/blob/master/DOCUMENTATION.md

[@stavrospantopoulos2620]

Hello, is it possible with FluidX3D to simulate in molecular scale or is it focused only on macro-scale?

[@ProjectPhysX]

Lattice Boltzmann is meso-scale, in between molecular and continuum. Instead of individual molecules, populations/groups of molecules are modeled as the "density distribution function". In practice, the length scale is not really important, as long as it's larger than molecular scale. All that matters is the Reynolds number, and there LBM offers the full range from about Re=0.001-100M. The simulation provides about 3 orders of magnitude in legts scale, so if you simulate 1m³ of air you can resolve down to 1mm³, if the box is 1km³ then the smallest cell size is 1m³.

[@최준영-b8w]

how much bitrate is required to display this video.. maybe 200mbps?

[@ProjectPhysX]

The original in 4K is about 750 MBit/s, enough to choke my computer :)

[@alphaindustries5775]

imagine this solver with and simple easy to use GUI, i would spend every day playing around with it. sadly I have no clue how to use cfd software and I dont want to be spending a couple of hours modeling and meshing something for just fun

[@dannya1854]

Did you make this with a profit motive?

[@ProjectPhysX]

No, I'm not doing it for the money. I have 3 main motives: 1. I originally wrote this software as a tool to get the impossible simulation task for my physics PhD done. I was very successful, and after my PhD figured this powerful tool would be beneficial to many other researchers as well, especially since it reduces hardware cost by about 100x due to the lower memory footprint, and electricity cost by about 2000x due to the much better efficiency. My main motive is to make super fast CFD simulations accessible to everyone. Free of charge, super fast, compatible with any hardware and operating system. That's why I decided to publish the source code with a no-cost non-commercial source-available license. I made this software free of charge to everyone, only excluding commercial and military use. 2. I just love programming and making computers do useful things. And working on this software taught me a lot. 3. My University didn't have the money for the super expensive licenses for all of the dog-slow commercial CFD software. These companies are greedy, and since they also sell their software as a service with hourly billing, they have no motivation to make it any faster. I have no regrets to make them lose customers to a better and free alternative. That said, I eventually want to open up the tool for commercial use too, in exchange for a license fee. Companies who make huge revenue with such software can also pay for it. For non-commercial use though, it will always remain free of charge and unlimited.

[@hlufty]

you can make aerodynamics of cow with this one

[@warguy6474]

how would i go about learning more about simulations? Im currently a 2nd year computer engineering major

[@denysrohachuk6338]

The new era keeps coming and coming, but we still don't know how to finally start it😂❤

[@simpilot001]

Just curious, I’d there a gui for this?

[@ProjectPhysX]

Setup scripts are written as C++ functions, but once compiled (~5 seconds) there is an interactive graphics mode to fly the camera around while the simulation is running. See the documentation for details: github.com/ProjectPhysX/FluidX3D/blob/master/DOCUMENTATION.md

[@ezdeezytube]

Has anyone computed the flow around a cow yet?

[@ProjectPhysX]

Of course, it's the most aerodynamic shape in the universe. kzbin.info/www/bejne/jKrbfo1oq7hmmqs

[@rendermanpro]

Low input bitrate and high compression, and youtube compression on top - killing whole idea. I would reupload in better quality. It's like get a Ferrari and put wheels from bicycle on it :) I would remake video at 200mbit bitrate and re-upload.

[@ProjectPhysX]

Even if I upload at 200MBit/s, KZbin internally compresses it and the detail is lost anyways.

[@nutzeeer]

can shapes be vector or math based so they are smooth?

[@ProjectPhysX]

Geometries can be loaded from vector format (.stl files) but they are voxelized for the simulation. For smooth surfaces, a very fine grid is needed.

[@SHOHOB2000]

This is astonishing! you sir are unleashing the full potential of GPUs in CFD simulations Can this software calculate lift - drag - visualize velocity / pressure - streamlines etc.? Also I wanted to know your opinion on something. I am a student responsible for CFD simulations in my graduation project, and my pc struggles with 1-2 million cells simulations I can easily get my hands on 4 GTX 1070 GPUs with risers. Do you think this can work? or it has to be A100 / H100 💸💸💸😂 Thanks in advance :)) and also thanks for this amazing software!

[@ProjectPhysX]

It can compute lift/drag, but so far the forces are not very accurate in the turbulent regime (too large by about a factor 2). I'm still working on more accurate boundary treatment. It can visualize streamlines and velocity, and also pressure on surfaces. FluidX3D works multi-GPU, and it does not care about what model of GPU as long as it's a lot of (combined) VRAM capacity and fast VRAM. 4x GTX 1070 8GB is fine, that will do ~600 million cells. Have fun!

[@SHOHOB2000]

@@ProjectPhysX WOWW over 500 million cells that is HUGE I definitely will use it even if forces are not 100% accurate, the visualizations can help see flow separation, swirls, wake behind parts, see where I can improve I PROMISE if I managed to do it I WILL inform you so you can watch it on my channel although I might take time to learn FluidX3D / university consumes most my time thanks so much for the nice response. Sincerely ❤❤

[@Juraj-z1e]

pls can you make RB17 animation ? THanks

[@byroneggimann8123]

I say next you put a cow in a formula 1 car to see the effects

[@danniboi7490]

@BeamNG figure out a way to implement this or something similar

[@nickg00]

Is this good with internal flows?

[@ProjectPhysX]

Yes, as long as the setup fits well in a cuboid domain.

[@crownvictoryfive6374]

Just need a $4,000,000 graphics card and a copy of this program.

[@ProjectPhysX]

Any gaming GPU is fine! FluidX3D works on all GeForce, Radeon and Arc cards, and also on Apple silicon. If you want to go big, snag 4 Tesla P40 24GB off eBay and you have a giant 96GB simulation rig for under $1k. Get a copy of FluidX3D here: github.com/ProjectPhysX/FluidX3D (it's free, yes the full version of the program)

[@ak-gi3eu]

Is it in Vimeo?

[@mustaphaben2921]

Can I make a simulation to build drag less eFoil board

[@igamewhenimbored7696]

Didnt someone use this software to show the aerodynamics of a cow?

[@vassilisbakalas3423]

are all these DNS?

[@ProjectPhysX]

Very close, DNS-LES, super high resolution LBM + Smagorinsky-Lilly subgrid model. Only the raindrop splashing is fully DNS.

[@akshdesai04]

I want to recreate these. Can someone please provide the files for these tests?

[@Nimmm03]

Nice, I watched the entire thing in 144p

[@justforbusiness9753]

we all are also going through this

[@zolazar6928]

Wow! I don't understand anything that's going on and all these big words are confusing. I'm just here because this sh*t looks cool.

[@carloszepeda1963]

POV: you are Adrian Newey

[@baL88537]

😳👍🏻

[@Peteboi64932]

Me after I stub my toe:

[@강냉이-y2m]

Bro has nasa computer

[@delch016]

Sooo…. A cow isn‘t a sphere?

[@petterlarsson7257]

youtube compression tutorial

[@looooool3145]

how did you become so smart? what do you eat? any tips? i am similar age to you, but dumb.

[@ProjectPhysX]

@@looooool3145 Through a lot of learning and hard work. Through not taking the easy path in life. Through trying, struggling, faliling, and trying again. I'll spare you the painful details. As for what I eat? Potatoes of course, I'm a German. And I'm vegetarian. No animals have to die for me, it's healthy, there is huge environmental benefits, and it's sooo much cheaper. Win-win-win-win. My tip: Find something that fascinates you. Understand how things work. Learn it. Solve problems. Become good at it. Be patient, learning is hard. Get back up when you fall down. The best investment you can make today is to educate yourself, so that your future self will take better decisions. That is what brings wealth.

[@frankdelahue9761]

​@@ProjectPhysXDo you use smart drugs, nootropics?

[@frankdelahue9761]

​@@ProjectPhysXLike Modafinil?

[@jorbedo]

4x RX 7900 XTX 24Gb (x4=96Gb Vram - 240 FP32 TFLOPs for $4k? better than 1x Instinct MI250 64Gb with 1 GCD $15,000? If only AMD could release a RX7900 with 32GB....

[@ProjectPhysX]

A better option would be 4x Instinct MI60 32GB ($600 each on ebay), they are both faster and cheaper than the 7900 XTX.

[@jorbedo]

@@ProjectPhysXPlanning to get a Asus MB with 7 pci slots.... Q. Why is faster when you get 14 FP32 tflops vs 60 tflops on the RX? Only because the memory?. Thanks

[@ProjectPhysX]

@@jorbedo the TFlops are completely irrelevant for CFD. The algorithm operates in the bandwidth-limit. Performance is directly proportional to VRAM bandwidth!

[@jorbedo]

​@@ProjectPhysX That means is better to configure (4) Mi60 with the 4 slot Infinity Fabric than letting communicate via the PCIe, in case a 16x/1x/1x/1x motherboards? Those cards are way ahead of their time, o 200 GB/s GPU peer-to-peer bandwidth (That's what you were talking about), PCIe 4.0, 32GB, Infinity Fabric... Wow!, Those (4) Mi60's are comparable to a Mi250 with 2 units and 128Gb (Maybe more like 75% performance)? Now we need a tutorial on how to deploy it on Ubuntu. thanks for taking the time to respond.

[@ProjectPhysX]

@@jorbedo InfinityFabric is useless unfortunately, AMD's driver for it is broken and segfaults. Communication happens over PCIe, so ideally you want a mainboard with 4x PCIe x16 4.0 slots. Performance will be very similar to Radeon VII, which is already 75-80% of MI200 performance. I'll cover Linux deployment in my tutorial.

[@zergidrom4572]

Now make an addon for blender and simply become a millionaire

[@panillion]

FUUUUUTUUUUUUREEEEEEEEEEEE

[@ProjectPhysX]

Everything is chrome^^

[@fabiofanf3e813]

how to turn your pc into a atomic bomb:

[@Cogsworth2234]

Aerodynamics of cow

[@Touchgrassplz]

I came here from the cow.

[@DanFrederiksen]

Have you compared it to reality? or things like surface drag and laminar wing profiles? like early computer graphics rendering algorithms there were many nuances of reality they didn't catch. If the result sharply differs from reality it's just for show with no real value

[@sayochikun3288]

When will you create a Minecraft mod? ✊😔

[@ProjectPhysX]

Never :) But lattice Boltzmann would be quite funny in Minecraft, each water block being one grid cell...