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diverges with RSM, converges with k-e

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Old   May 27, 2012, 13:57
Default diverges with RSM, converges with k-e
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Hi,

I am simulating the flow around a cube in a turbulent channel at Re = 40000. I use enhanced wall treatment and my y+ values are around 2. First I solved with realizable k-epsilon, and I had good results, in accordance with articles. Now, I switched to RSM and it explodes. I have x velocity of 1e6 in the channel. I decreased relaxation parameters yet it always diverges. It says turbulent viscosity is limited to 1e5 and after a few iterations backflow at the outlet.

May anyone have an idea about it?

Thanks
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Old   May 27, 2012, 16:43
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Now, I also changed the mesh and the domain. I increased the length of the channel behind the cube. But there is still no difference. Always, turbulent viscosity limited to 1e5.
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