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Modelling Boundary Layer Separation from A Sphere

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Old   October 7, 2006, 05:27
Default Modelling Boundary Layer Separation from A Sphere
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I am trying to model flow over a sphere, where the boundary layer on one side remains laminar and separates early, while on the other side of the sphere the boundary layer is tripped into turbulent, and separates later, creating a pressure differential on the ball.

However, I am having trouble modelling this, for free stream velocities ranging from 20 to 40 m/s, and I have been told that CFD cannot model boundary layer separation very well. Is this true, and why? Any advice? Thanks
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