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July 8, 2010, 19:45 |
Flow past 2 smooth circular cylinder
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Join Date: Jul 2010
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Hi,
I am trying to simulate the flow past 2 smooth circular cylinder at Re=5.10^5. The diameter of the cylinder is 0.2 m. I'm using the k-e turbulent model and a transient formulation. For the specification method I put the turbulent length scale at 0.0225 and the turbulence intensity at 0.8 as recommended in a publication for the flow past one smooth cylinder. (length scale/D=0.0045) Nevertheless when I look at the results for the Y-velocity, for the vorticity magnitude or the static pressure I don' t see any eddies. It looks like the flow just started to pass over the 2 cylinders. But I launched the simulation up to 200 seconds. My time step is ok, my mesh is ok, my Y+ are comprised between 30 and 300. For the solution method I put 2nd order for the momentum, turbulent kinetic energy and turbulent dissipation rate. That's why I guess there was a problem in the input parameters. I'm going to launch some simulation with a turbulent length scale smaller and see whether it is the problem or not. I precise that those parameters work with a single circular cylinder. Could you please give me some advices to help me to understand my mistake ? Best regards, Slip |
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