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Old   August 5, 2007, 12:56
Default golf bal simulation
  #1
jan
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i have problems to simulate a turning golfball , altough i can simulate one in fixed position i want to simulate that it in 3 directions and find out what the best is in certain direction and speed so left turning or the other way right turning

i only can find to simulate moption of a whole domain with a inlet , so guess this is not right for this kind of simulation or is it?
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Old   August 6, 2007, 15:47
Default Re: golf bal simulation
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jan
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any one??????
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Old   August 6, 2007, 18:32
Default Re: golf bal simulation
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Glenn Horrocks
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Hi,

I am assuming you are modelling the golf ball dimples spinning. I would use a rotating frame of reference to do this. You can change the rotation axis and direction to generate different ball spins.

Correctly modelling the effect of the dimples on the boundary layer would be difficult and will require careful validation. Good luck.

Glenn Horrocks
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Old   August 6, 2007, 18:54
Default Re: golf bal simulation
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jan
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hi glenn thanks i have used rotating frame,but how do i see in simulation how the ball is spinning altough the boundery layers is second order first i want to see the ball spinning and its effect then the change in mesh but now i just cannot see any movement is it me or...........
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Old   August 8, 2007, 07:03
Default Re: golf bal simulation
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Glenn Horrocks
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Hi,

To see the spin fire up CFX-Post and look at the mesh. You will see it spin (If you have set it up right!). You should also see the effect of the spin in variables such as "Velocity" (measured relative to the local frame of reference, in this case rotating) and "Velocity in Stn Frame" (measured relative to a stationary or absolute frame of reference).

Glenn Horrocks
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Old   August 8, 2007, 07:46
Default Re: golf bal simulation
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jan
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well thats the problem i see the velocity in stn frame but not any movement of mesh so i do something wrong but what?

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Old   August 8, 2007, 11:38
Default Re: golf bal simulation
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brunoc
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Hi there,

If your simulation is steady state then your final solution won't have "mesh motion". To see it "moving" you will have to set it manually, I guess by using keyframes on CFX-Post.

If, on the other hand, your did a transient simulation (and thus used Transient Rotor-Stator interface) all your transient results will already have "mesh motion" embedded.
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Old   August 8, 2007, 12:22
Default Re: golf bal simulation
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jan
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you say ." to see it moving you have to set it manually "

but what do i set manuallt then

key frame in animation does not show me moving mesh

......

i am really stuck with this one

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Old   August 8, 2007, 13:52
Default Re: golf bal simulation
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brunoc
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If you did a steady state simulation your results file holds only the variable values of an average in time. Your mesh is actually still. You motion would just be post-processing.

Keyframe won't show you the mesh moving unless you tell it to do so. I've never done this, but my guess is that you'd have to manually rotate your the golf ball by small angles and create keyframes according to these changes.

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