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Forum: CFX

July 4, 2011, 09:59

Replies: 7

Turbulence modeling

Views: 1,921

Posted By omidiut

Thanks all I find something about grid...

Thanks all
I find something about grid resolution and surface grid spacing in ANSYS CFX- solver theory guide p.81 : DES simulation.

is this problem because of grid induced separation?

Forum: CFX

July 4, 2011, 09:53

Replies: 7

Turbulence modeling

Views: 1,921

Posted By omidiut

Hi Thanks but its very small! i use timestep...

Hi
Thanks
but its very small! i use timestep value equal 0.008 but the Drag be constant, i think with smaller timestep this problem repeat, whats your idea?

Forum: CFX

July 2, 2011, 03:27

Replies: 7

Turbulence modeling

Views: 1,921

Posted By omidiut

Turbulence modeling

Hi all
I'm simulating flow around sphere at Re=1E05 with DES(Detached Eddy Simulation) turbulence model. the Y plus=0.2 and time step size=0.008.
The mean drag coefficient is 0.27 and there is...

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