Calculation of k for turbulence modelling

Using SimScale Fluid Flow / CFD
1

Hi,
I am trying to run a AMI Simulation. I like to run this with k-Omega-SST. But I still don’t know how to calculate k and Omega. I tried to understand many literature but it is still not clear. Maybe somebody can explaint this in a easy way?

Thanks. :slight_smile:

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Hy @vivien

you can fine a detailed documentation about turbulence modeling here

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@ Anware: I already studied this page, but I don’t know how I can calculate the turbulence intensity with the formula on the page? I don’t have u’.

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ok @vivien

here is the formulas

Turbulent Kinetic Energy (TKE), k

Capture

Evaluation of turbulent dissipation

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Capture11168×365 49.8 KB

for more info @1318980 will get back to you

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So, for an impeller I=0,1, or?

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Hi @vivien. Very much depends upon your setup. For an impeller you are probably drawing fluid in through a pipe, in this case you could calculate turbulent Intensity from the formula highlighted in this article:
Defining Turbulent Boundary Conditions

equation 4.

Cheers,
Darren

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This was really helpful. Thanks a lot for the informations.

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