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flow over a sphere at Re=10,000

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Old   April 13, 2009, 23:52
Default flow over a sphere at Re=10,000
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Raheel Rasool
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Good Day,

I am trying to simulate flow over a sphere(using water 998.2 kg/cubic m) at Re=10,000 (V=0.01005 m/s) using Fluent. The following is my simulational setup:
  • unsteady LES with dynamic smagorinsky model
  • PISO (pressure velocity coupling)
  • standard pressure discretization and second order upwind for momentum and energy
  • time step size is 19.9005 sec (based upon assumed St=0.2, giving 25 steps in one cycle)
The problem is that my drag convergence history is a bit offset from those calculated by other people. Its a bit high, varying between 0.5~0.4 whereas it should be in the range of 0.42~0.37
I would be greatful if somebody can guide me in this regard.
Best Regards,
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