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Convergence - Mixed Convection - Circular Cylinder

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Old   May 30, 2016, 04:51
Post Convergence - Mixed Convection - Circular Cylinder
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Hello Everyone,

I am trying to model, mixed convection heat transfer around a circular cylinder using FLUENT.

Following are the details of my setup:
1) Polar co-ordinate system.
2) The Cylinder of diameter 1m is placed at the origin and the boundaries are placed 150m away form the cylinder surface.
3) The Reynolds number is 40 and Richardson number is 4.
4) Corresponding inlet velocity is 0.000584293 m/s and the gravity is -8.1935e-05 m/s2.
5)Boussinesq approximation.

Problem
The solution is not at all converging. (Reversed flow at x faces at pressure-outlet).

I have already tried
1) Changing the outlet boundary to outflow.
2) Moving the boundary far away from cylinder (I tried even upto 1000m).
3) Using PISO, PRESTO methods.
4) Gradually increasing the Ri value.
5) Unsteady solution.
6) Reducing URF values

Kindly please help me solve this. THANK YOU.
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Old   August 16, 2016, 12:31
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circular cylinder, convergence., fluent, mixed convection, natural convection

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