Use of k omega turbulence model

john_w · September 20, 2009, 20:11

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

paulo · September 21, 2009, 10:29

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

lakeat · September 22, 2009, 06:15

My advise is to check CFL condition, fvSolutions, fvSchemes, and esp. the boundary conditions.

September 20, 2009, 20:11	Use of k omega turbulence model	#1
john_w New Member John Weaver Join Date: Mar 2009 Posts: 6 Rep Power: 17	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

September 22, 2009, 06:15		#3
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	My advise is to check CFL condition, fvSolutions, fvSchemes, and esp. the boundary conditions. __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

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September 21, 2009, 10:29		#2
paulo Member Paulo Alexandre Costa Rocha Join Date: Mar 2009 Posts: 71 Rep Power: 17	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