[oda]

Hello,

I'm beginner in OpenFOAM and want to create new Reynolds Stress Model (RSM).
That's Hanjalic and Launder model.(1998, CONTRIBUTION TOWARDS THE SECOND-MOEMNT CLOSURE MODELLING OF SEPARETING TURBULENT FLOWS)

https://www.researchgate.net/publica...port_Modelling

So, I tried method that modified Launder-Gibson-RSTM turbulence model to Hanjalic model.
I did the following two things.

1) make a character definition (aij, A eij, E etc..) in Hanjalic.C.
ex)

            volSymmTensorField aij = ((R_/k_)-(2/3)*I);
            volScalarField A2 = (aij && aij);

2) modified each term (Dij, Y etc) in Hanjalic.C.
ex)

Y = - C2_*Fe*epsilon_*(epsilon_-D)/k_

Other than that I did not do anything.So, compile of Hanjalic model is OK.
But, that model diverge soon.

So, I have a question.
1) Is that way to create new RSM corrected ?
2) Is that way to make a character definition corrected ?

I don't know whether to tell it well, please give me advice.

Please forgive me my lousy English.
Your help is highly appreciated

Thanks!

oda

[oda]

anyone, help me

[Ash Kot]

Originally Posted by oda

Hello,

I'm beginner in OpenFOAM and want to create new Reynolds Stress Model (RSM).
That's Hanjalic and Launder model.(1998, CONTRIBUTION TOWARDS THE SECOND-MOEMNT CLOSURE MODELLING OF SEPARETING TURBULENT FLOWS)

https://www.researchgate.net/publica...port_Modelling

So, I tried method that modified Launder-Gibson-RSTM turbulence model to Hanjalic model.
I did the following two things.

1) make a character definition (aij, A eij, E etc..) in Hanjalic.C.
ex)

            volSymmTensorField aij = ((R_/k_)-(2/3)*I);
            volScalarField A2 = (aij && aij);

2) modified each term (Dij, Y etc) in Hanjalic.C.
ex)

Y = - C2_*Fe*epsilon_*(epsilon_-D)/k_

Other than that I did not do anything.So, compile of Hanjalic model is OK.
But, that model diverge soon.

So, I have a question.
1) Is that way to create new RSM corrected ?
2) Is that way to make a character definition corrected ?

I don't know whether to tell it well, please give me advice.

Please forgive me my lousy English.
Your help is highly appreciated

Thanks!

oda

My suggestion would be first to try generating this same model using anyother propritory software.

OpenFOAM is easy to modify and develop, the issue occure when the bugs start causing divergence although the physics behind the modeling is correct.

[oda]

Hi Ash!

Thanks you for your reply.
Sorry for lack of words.
I could use other software for Hanjalic and Jalirlic model.

So, I want to use that model in OpenFOAM.
Though compilation is successful, diverge quickly.

I don't know whether corrected file and how to modify is right or not.
Please give me advice.

Thanks!

oda