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canopus February 17, 2011 11:40

turbulence generator @ Inlet for LES
 
Hello
I have mean velocity and turbulent kinetic energy profiles
from experimental data. I want to use this as an input to
my FORTRAN LES code.

Can you please suggest(hints/literature) what are the simple methods to generate a fluctuating field at inlet using the data above?

I have tried random fluctuations based on random number generator
but they do not seem satisfactory.

Best regards
SM

farahnak.mehdi April 28, 2011 16:54

hi
 
hello every one.
i want to model a isotropic turbulent flow with openfoam.
my case is a turbulence generator in a wind tunnel.
i just know the velocity of air at entrance of the tunnel
i want to model it with simplefoam.
what boundary condition must i choose for P and U and ....?
please help me

AndreaF December 7, 2016 10:53

Hi Canopus,

Did you find any solution to your problem? I'm facing the same issue for a DNS simulation.

Thanks in advance,
Andrea

sbaffini December 7, 2016 11:29

It's been a while since the last time I went trough LES/DNS literature, but the following are good starting points:

http://www.sciencedirect.com/science...45793009001601

http://www.annualreviews.org/doi/abs...rnalCode=fluid

http://www.sciencedirect.com/science...21999112006389

Edit: the last link points to the method that, in my opinion, is the most simple, and yet powerful, to use. Even if i didn't implement it myself, the unique issue I can see for the implementation is to have a coherent (i.e., shared) pool of random numbers among the different processors fixing the inlet.

AndreaF December 7, 2016 13:19

Thanks a lot Paolo!

I will have a look to the articles and try to find a solution suitable for a Fortran90 implementation.

Regards,
Andrea


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