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Use of k omega turbulence model

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Old   September 20, 2009, 19:11
Default Use of k omega turbulence model
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John Weaver
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Hi folks,

Just wondering if anyone has encountered any difficulties using the k omega turbulence model within OF 1.6? I have been running a few simple simulations with the incompressible PisoFOAM solver that work very well with the k epsilon and k omega SST turbulence models. However, my solution diverges after a few time steps when I use the k omega turbulence model, even when I use exactly the same initial values (including k and omega) as with the k omega SST turbulence model. The simulation is simply an internal flow through a duct.

Thanks, John
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Old   September 21, 2009, 09:29
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Paulo Alexandre Costa Rocha
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Hi,

If you are running a transient simulation, try decreasing the time step. If it is steady state, decrease the relaxation factor.

Which formula are you using to calculate omega at the boundaries?

Best Regards,

Paulo Rocha
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Old   September 22, 2009, 05:15
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Daniel WEI (老魏)
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My advise is to check CFL condition, fvSolutions, fvSchemes, and esp. the boundary conditions.
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