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Forum: OpenFOAM Running, Solving & CFD January 3, 2013, 15:17
Replies: 11
Views: 2,576
Posted By Matt1986
Hi, The problem with the high cd values is...

Hi,

The problem with the high cd values is solved.
There were problems with the boundary conditions.

Thanks,
Matthias
Forum: OpenFOAM Running, Solving & CFD December 26, 2012, 17:08
Replies: 11
Views: 2,576
Posted By Matt1986
Here are 2 pics of the case Regards Matthias

Here are 2 pics of the case

Regards Matthias
Forum: OpenFOAM Running, Solving & CFD December 26, 2012, 17:03
Replies: 11
Views: 2,576
Posted By Matt1986
Hi, I had a few problems with the 3D-case...

Hi,

I had a few problems with the 3D-case and the calculation time was very high.
So I set up a 2D case (extrudeMesh) of a long cylinder to get rid of the problems.
I chose a low Reynold number...
Forum: OpenFOAM Running, Solving & CFD November 27, 2012, 16:04
Replies: 11
Views: 2,576
Posted By Matt1986
Hi, Thank you very much for your help. I...

Hi,

Thank you very much for your help.
I hadn't known, that nut is called nuSgs in this case.


Regards Matthias
Forum: OpenFOAM Running, Solving & CFD November 27, 2012, 05:51
Replies: 11
Views: 2,576
Posted By Matt1986
Hi, Thank you for your help. I have read...

Hi,

Thank you for your help.
I have read the post of your link.
The following formula is given for fv1
x^3/(x^3 + cv1^3)
with x=nut/nu
cv1=7.1

According to
Forum: OpenFOAM Running, Solving & CFD November 23, 2012, 09:28
Replies: 11
Views: 2,576
Posted By Matt1986
Hi, My Simulation runs without B. Now then...

Hi,

My Simulation runs without B.
Now then I only need the definitions for the nuSGS and the nuTilda.
If the nuTilda is calculated as in the RAS Spalard Allmaras case, I only need the definition...
Forum: OpenFOAM Running, Solving & CFD November 13, 2012, 09:18
Replies: 11
Views: 2,576
Posted By Matt1986
I have only found the following formulas for B...

I have only found the following formulas for B and nuSgs in the forum.

B = 2/3 rho*k*I-2*mu_t*D

nuSgs_ = ck_*delta()*sqrt(k(gradU));

But I am not sure if these are applicable and what...
Forum: OpenFOAM Running, Solving & CFD November 13, 2012, 08:13
Replies: 11
Views: 2,576
Posted By Matt1986
LES SpalartAllmaras Simulation questions

Hi,

I am doing a LES simulation of a ball, which is flowed by air. I am calculating the draft coefficients of the ball with different Reynolds' numbers.
My SpalartAllmaras LES model is running,...
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