COMPUTATIONAL FLUID DYNAMICS | CFD BASICS

In this week’s video, we talk about one of the most discussed topic in Fluid Mechanics i.e. Computational Fluid Mechanics (CFD). CFD is a branch of fluid mechanics that uses computers to simulate fluid flow problems. We talk about the need for CFD and the various steps involved including discretization(meshing), solution and post processing. We also talk about the fifferent forms of the Navier stokes equation that are used to reduce computational effort from direct numerical simulation(DNS), Large eddy simulation(LES), Reynolds Averaged Navier Stokes (RANS)equations.
The tutorial on ANSYS FLUENT will be uploaded soon.
Hey! If you haven’t come across our channel yet, we are five masters students (Nikhilesh, Kushal,Ankith, Akshar and Sanjeet) pursuing Aerospace Engineering at T U Delft in the Netherlands and make science videos every week. Please do subscribe to our channel and share the videos.
#Science #TUDelft #Masters
Also check out Ankith’s other channel at / ankithjohn

[@jayteehope217]

00:00:00 Introduction 00:00:53 Fluid Dynamics/Mechanics Introduction 00:01:23 Motivation to use CFD 00:02:00 Fundamental Principles of Fluid Dynamics (Conservation of Mass, Momentum and Energy) 00:04:38 Navier-Stokes Equations and Limitation of solving analytically 00:05:49 Solve Navier-Stokes Equations with help of CFD 00:06:30 Discretization 00:07:37 Convert Partial Differential Equations into a System of Linear Algebraic Equations 00:09:24 Solving process 00:09:51 Post-Processing: Visual Inspection, Check on Mass Conservation, Force Inspection etc. 00:10:36 Solving Turbulent Flows: RANS vs LES vs DNS 00:11:38 Reynolds-averaged Navier-Stokes equations (RANS): Time-averaging of Flow Qunatities 00:12:45 Large Eddy Simulation (LES): Modeling of small-scale Eddies, Resolving of large Eddies 00:13:28 Wrap-up

[@nishipal3297]

You people should be acknowledged for your work by great academicians..keep shining

[@bhushan797]

1st video on KZbin who removes doubts about CFD kudos to you guys..

[@EAR.Pakistan]

Great dears. I hope u will reply my question too. 1. In my CFD analysis, Total pressure is not being equal to static pressure plus dynamic pressure. Where I am wrong? 2. Why velocity profile is near walls. 3. How to display maximum / minimum values of results in graphic display.

[@rajasgaikwad883]

Thanks a ton for making this video! The level of attention to details is unparalleled, feels like I've read an entire book in this 15 minute video. Keep up the good work guys! Your efforts are very much appreciated. Cheers!

[@benjaminkohweien6572]

This is very informative for my final year project, thank you.

[@SIRAC.KILINC]

I can't pass this video just by watching. I both liked and commented. Thanks to two of you👍

[@Ameerscholary]

guys u just made huge shortcut for fluid dynamics thnx alot for this video

[@uvaraniaka1920]

Hi guys, this video is really informative to clearly understand the overviews of CFD. Randomly i saw this video and very impressive of you guys.. clearly explained how all the things worked out in CFD... keep going

[@Tamb097]

Compliment, very clear without report confusional or wrong info

[@FazlayElahi]

Love from Bangladesh 🇧🇩❤️

[@aakashsr6404]

Excellent work!!! Not only the fluid flow, your flow of explanation is exceptional...! Cheers both you guys !!!

[@mbinacedric3566]

thank you for your explanation, it is so clear!!!

[@adityanayak3314]

May I request you sir when one person explain that is better to group because student watch your vedio that is very briefly stable in his mind thank you sir

[@venkatabrahmatejaharidasu9656]

This is really a great video.... I still can't understand why there are only 3k subscribers..

[@shilajawani4003]

Great...two gem....But How do I grow up my knowledge in theoretical part ?Any book ? Thanks a lot bhai (for the video )

[@raghukoduri2018]

hope u continue the CFD series....very informative and thnks a lot

[@rameenmeerann4876]

Wow I like the video of CFD with simple explanation, may continue with a real simulation as examples. Great

[@NeptunePictures]

Watching you from France. Very instructive ! Thank you :)

[@AKannadiga]

Found this video very insightful. You guys have explained all the concepts very well. Waiting for the ANSYS video. Please upload it soon guys. Keep up the good work!

[@manikandanr7389]

Kindly give videos that should explain works of journals.

[@adityanayak3314]

Good very nice

[@arnabsaha2330]

please make a video on basics of fluid dynamics it will be helpful for me . By the way this video is very well explained.

[@diegos2184]

Super bueno, muchas gracias, it means, Very good, thanks from colombia

[@harshakorlur1007]

Very Good Brief Introduction for beginner like me. Thank you very much.

[@ubaidmundewadi6368]

Really helpful video...Make more videos to explain the integral terms

[@bharatbhusanrout8726]

Superb bro .. u are make this cfd very easy

[@abhishekmc5483]

please explain this : low pass filter in LES, modelling the reynolds stress means what?

[@ziaurraman3237]

Very accurately explained

[@kottapallibalamuralikrishn4703]

Thank u sir,this vedio helped me a lot

[@natarajanm8051]

Very very nice video..super 😍 But..i expected more animation it's easy to understand... Thankyou

[@Heremyadress]

This is a great video with terrific explanantion of the topic!

[@deepakdivakaran9320]

Very useful content, The curve example which was the simplest example to explain discretisation. Please do more videos :-)

[@kodururaju3230]

Nice explanation all the best

[@ranilorubiano]

Great Summary. I hope you guys have better visual aids in explaining those important equations... But this is worth watching and as if the summary of what i learned about CFD in several months..

[@jhwblender]

I know it's a bit of work. But I would appreciate subtitles

[@2BrokeScientists]

Thanks Jesse for the suggestion, we will try and add it soon!!

[@jhwblender]

Thank you! 😃

[@bhaskarchawdhary6219]

Wow, thanks alot sir. You explained the topic so well.

[@abhishekm1755]

Clear understanding...... thank you so much guys 💐💐💐💐💐💐💐💐💐💐💐💐💐

[@Ameerscholary]

i will write each mote you mention god bless you

[@engineers_hub]

Where is the ansys demonstration link you spoke about in the video?

[@abhishekshingala1212]

Simplest explanation. Thanks

[@laidsalem1554]

Hi,how to find initial conditions and boundary conditions, but I have only Mach number (supersonic velocities), inlet angle and Reynolds number. Thank you.

[@haria5482]

Good job. Very informative.

[@DK-gt9br]

How can i understand that how mathematics is working behind a fluid flow i mean i can't imagine this mathematics? What should i do And thank you for such a wonderful explanation

[@petsatcom]

Great job thanks

[@contentofAI]

Thank You sir

[@debasis8523]

Good video

[@senthils5416]

Whatever the equation and theory it may be it ll b helpful if u explain in detailed form n concepts with practical examples.basics of Ansys is very important to know CFD.so pls try to upload the video lectures accrding to tat.

[@wolah100]

I think convergence should have been included to make it more rounded.

[@shivendrapatel443]

Make a video suggesting which software should we use for CFD like comsol, ansys, abacus etc

[@2BrokeScientists]

Hey, it really depends on the specific case and the prior experience you have with these software's

[@rushabhyeshwante]

Thanks for making this video.

[@yukieperamesti]

Thank you for the video. Would I ask a question about meshing? If I want to simulate the gas explosion in the tunnel (but it is simulate by experimental apparatus). What is the appropriate kind of mesh can I use? Thank you, please let me know the answer. Thank you

[@yukieperamesti]

the shape of experimental apparatus is block with the dimension 25 cm x 19 cm x 164 cm

[@noway2831]

Is there a way to take limits in computer science using the epsilon-delta definition? As in, instead of doing f(x+0.00001) where f(x) is undefined but \lim_{h \to 0} f(x+h) is defined?

[@sudhidm3122]

Excellent job guys.👌👌👍

[@engineeringsimulationstudi1404]

nice

[@gokulsomanathan9540]

Myself 25yr old I want to change my path in this career.. Previously was am piping stress engineer..can u explain scope and various platforms of this and one thing is I don't want to doing any course and also getting knowledge from books and videos those enough for beginning

[@STWNoman]

Awesome

[@STWNoman]

Make a video to explain these integral terms

[@ayanthasilva4094]

Superb guys. 🤟😍

[@benjaminoluwadare6125]

Hi, Please send video on turbulent flow modelling. Tx

[@2BrokeScientists]

You can check out this beaituful channel for all the details: kzbin.info/aero/PLnJ8lIgfDbkrhQTjGZ_22z7NoktJTrTF1

[@devangmistry1172]

Beautifully explained. love it.

[@NB-zj4yv]

Thanks for this video

[@atulverma8736]

loved the video

[@watchwise2231]

Thank you guys, great , looking forward for your next video

[@2BrokeScientists]

Thanks for watching, stay tuned for more!!

[@sherlockk6547]

👍👍

[@vishvanthgunasekaran1316]

where can i learn more about CFD?

[@denonavarra5567]

Спасибо

[@smailhamidatou367]

Sir thanks for your efforts to... but I have a question which is at 12:15 min how I can get their equation RANS?

[@shanuddin6876]

beautiful explanation ty alot

[@coffeegirl8285]

Really enjoyed the video and cleared a lot of my doubts..... but the outro volume gave me a heart attack

[@tuhinpatranabish4450]

How to get Andy's Fluid software

[@mangeshdeshmukh2140]

Brilliant Explanation , you made things easy to understand , great teachers , keep it up & god bless you both !

[@saisharath2496]

Hii.. I need to know more about the CFD stimulation how can I approach you can u please explain to me

[@sakumaran94]

Awesome overview

[@michaelshaughnessy9809]

where is the Ansys Fluent tutorial?

[@albitesdecenonancybetty2775]

very clear, thanks a lot

[@mosta7050]

you're amazing guys

[@RamPrasad-jx5cg]

Its very Nice

[@tuhinpatranabish4450]

How to get ANSYS FLUENT software

[@nikhilmahalingesh7561]

Won't low-pass filtering remove large scales in LES?

[@2BrokeScientists]

In Large Eddy Simulations(LES) the idea is to resolve the large scales and model the small scales. The small scales correspond to higher frequencies, where as large scales correspond to the lower range and hence low pass filtering will allow low frequency(large scales) and attenuate higher frequencies(small scales). Link: sites.google.com/site/smokeisnojoke/lesrans2.jpg

[@Kme-karanAhirwar]

Can we apply ns equation for two different domain at a same time in cfd.

[@AngelLestat2]

it is possible to simulate many different physics aspects in the same simulation? Like the effect of buoyancy, thermal flow, phase change for parameters that variant with height for example?

[@2BrokeScientists]

Yes, I think there are options to implement the specific conditions on some solvers. But we would suggest you to go through the Software manual to see if it can be implemented.

[@AngelLestat2]

​@@2BrokeScientists thanks, glad you answer. one last question, without knowing nothing of CFD and the basic principles and formulas for the physics involve, how many hours of tutorials and practice are needed to start to understand how operate these complex softwares? I imagine around 50 to 150 hours? Or some are quite easy to figure out?

[@2BrokeScientists]

That would depend on what your goal is. If you are just curious to learn what is happening about the flow then you can just follow some online tutorials and implement them but to actually produce results that mean something its better to start from the fundamentals and then build from there. The time for that is highly variable on your pace of learning and how in depth you want to go

[@anandh1967]

Super sir

[@krishnamaurya9761]

🙏🙏

[@erianmuk6091]

Thanks guys!

[@agileshathithya]

interested for the equation

[@joshuaprabhatpallapati5266]

can u suggest some text books for cfd ?

[@mechanicalengineering1528]

J.D Anderson, computational fluid dynamics. Hoffmann, computational fluid dynamics ,with different volumes

[@petsatcom]

What CFD software is affordable for 2 broke scientists? I assume the $20K software packages are out of reach?

[@2BrokeScientists]

Haha, don't think we have the money to afford any CFD software 😅 Hence the broke scientists 🤣

[@rushabhyeshwante]

Use OpenFOAM, it's free,but you need an understanding of C++. In OpenFOAM you will get lots of online support. There's also Salome-CFD. Star CCM+ is GUI based but it is damn expensive.

[@vishvanthgunasekaran1316]

are you tamil

[@Ashatechdotcom]

Hahaha thank you the two broke scientists

[@arjunkk3146]

Bett