Introduction to stationary turbulence modeling (RAS) - Part 1

"Introduction to stationary turbulence modeling (RAS)" - Part 1

This material is published under the creative commons license CC BY-NC-SA (Attribution-NonCommercial-ShareAlike). If you plan to use it, please acknowledge it.

Download the blockMeshDict file here:

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This video contains auxiliary material for students at the Johannes Kepler University in Linz, Austria. Students from other universities are welcome to use it for their learning purposes.

Thanks to Gavin Tabor from the University of Exeter for his input.

This series is based upon CFD tutorials created at the Vienna University of Technology in a cooparation with Bahram Haddadi, Christian Jordan and Michael Harasek and further improved at the Johannes Kepler University in Linz, Austria.

The used OpenFOAM version was precompiled by Andras Horvath from Rheologic GmbH, you can download it here:

[akashcast]

just finished your basic and intermediate tutorials. Your videos are clear, have perfect pace and helped me begin to understand OpenFOAM. Looking forward to seeing more :)

[TongShaLexie]

Thank you so much! This is so helpful for a new OpenFOAMer🤣

[mathiassnderskov]

Love how you show theory and dig directly down to code to highlight where stuff happens! Thanks.

[obione]

this video make too much sense :DDD. I have been trying to understand k-epsilon and omega models and what nut means and you solved my problems. Thanks a million

[Ballba]

Thank you Jozsef, I am finding your tutorials a great help, I look forward to watching your future videos. 

[JZ]

The code walk through part is too fast for me, but since my experience with C++ is close to zero and this is just a "skim through" of the code, I still think it is valuable to have it here. Thank you for taking the time to do these videos!

[VinnieDreher]

Boss, you're amazing.. Maybe some motorbike tutorial? Cheers

[thear]

Thank you very much for your nice video.

[kendalmalone]

Hey Joszef, i got a small question. I'm working on a case right now and i have given a "free stream turbulence level" of x, x%. Is this equal to the turbulent intensity you are talking about at min 11:00 ?

[pingchang]

Hi József Nagy, thanks for your viedo. It is really helpful, I am a new to OpenFOAM. I have a small question, what do the nut and nuTilda mean in this case? Thank you very much.

[andrestapia]

thanks for the video! it is very clear and usefull!

[stevenforrester]

Jozsef, the tutorials are very helpful and hope you keep posting more videos.  Could you add a link to the notes you refer to you in the video.

Thanks

[stormpeanut]

Really really really helpful. If you have time, can you make tutorials about the unstatic mesh??

[raulgrunewald]

Hi! Thank you very much for the video!
I have a question, I understand that this is a 2D case, but if you want to solve now the same case in 3D, for example using 0.15m depth, how would the characteristic length be calculated?

[TheHarishkg]

HI Jozef, can u do a video on OvrPimpleDymFoam ? Thanks

[vanduyenvimaru]

Dear Sir,
Thank you for your tutorial, actually it is so helpful.
In your video, you calculated epsilon coefficient with considering of value of L.
In my problem, I want to simulate a flow around a cylinder with diameter is d and length is L.
So I have a question: When I calculate epsilon, will I use diameter or length of the cylinder?
Best and regards.

[ashutoshsingh-etvm]

Hello sir if you have any codes for jet impingement cooling pls share me it would be great help

[shiqiwang]

Hello, I have done this example after your tutorial step by step and it works very well. I've learned a lot. However, I want to modify the boundary condition from velocity inlet to pressure inlet because in most cases, we only know the inlet pressure conditions rather than the inlet velocity. I changed the initial conditions to : p inlet : total pressure, fixed, uniform 200(relative pressure), outlet: inletOutlet, inletValue uniform 0;   U, inlet, pressureInletVelocity, outlet, pressureInletOutletVelocity. Sadly, it didn't work. Could you please show me a method to make it work?  Sorry to disturb you again.  

[christianalvarez]

Hi! I have two questions, first: Do you have any reference for the kinetic energy equation? k=3/2(Uref*Ti)**2

Second: What do you mean with " L=characteristic length scale"?

Thank you!

[fitnessmythwalakaka]

Hi Jozsef!

Thank you for your videos, I find them really useful! Could you please clarify if the l = 0.07L is acccurate? for K-epsilon?
Because I found this one the openfoam documentation for the k-epsilon solver and it says that l = L. The link to the documentation is given below:


Thank you for contributing :). Really appreciate your work.

Regards
Shafik