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-   -   Calculate and display eddy viscosity (http://www.cfd-online.com/Forums/openfoam-solving/57913-calculate-display-eddy-viscosity.html)

 ceyrows May 2, 2008 04:49

Hello everybody, I have bee

Hello everybody,

I have been doing some URANS-calculations using different turbulence models and would now like to display the eddy viscosity. This is not possible directly because the nut-field data has not been written. Using paraview's calculator is also not an adequate option...

Is there a utility for calculating the eddy viscosity field afterwards?

Thanks a lot,

Thomas

 olesen May 2, 2008 05:52

Attached is one that I have ki

Attached is one that I have kicking around for calculating mu_t for k/eps (we only have compressible flow). You should be able to adapt it to nu_t without too much effort.

http://www.cfd-online.com/OpenFOAM_D...s/mime_txt.gif turbvisc.C

 ceyrows May 2, 2008 06:10

Hey Mark, thank you very mu

Hey Mark,

thank you very much! Unforunatelly I'm a newby to C++ and so there's still a question:
Is Cmu a constant in your utility or is it calculated (for non-linear turbulence modells like realizable-k-epsilon)?

Thanks anyway,

Thomas

 ariorus May 2, 2008 06:41

The function nuEff calculates

The function nuEff calculates automatically viscous + turbulent viscosity according to the employed turbulence model.

For example in simpleFoam you can compute it via

turbulence->nuEff()()

Are you updating nut at each t

Are you updating nut at each timestep? Somewhere in your solver you should have a nut = turbulence->nuEff()

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