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reverse flow at the outlet

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Old   October 15, 2014, 10:54
Default reverse flow at the outlet
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Khalid Ansari
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hello,

i m working on flow past a rotationally oscillating cylinder.

and i m using udf and dynamic mesh for it. so when i m using udf file and running the calculation. it is constantly giving me reverse flow at the outlet.
and the solution doesnt converge. pls help me experts.

plsss.

i extended the outlet far from the cylinder. used 2nd order upwind momentum equation.
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Old   October 18, 2014, 00:53
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Which boundary condition did you use. My guess is you have used Pressure outlet BC (given your problem is at low RE, if its a compressible flow problem, then its a different game altogether). Try using outflow instead.
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