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Immersed Solid no flow!

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Old   May 12, 2010, 02:57
Default Immersed Solid no flow!
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Carl vance
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Hi folks,
I am a design engineer currently learning the ropes of CFX, I have a problem to solve of a moving gate valve, we are looking for cavitation issues behind the gate during high speed movement.

I have set up the transient simulation using an immersed solid domain for the moving gate and specifying a linear motion of the gate as a function of time for the duration of the test.
The fluid domain where the gate moves is of a fine mesh (finer than the solid) and contains interfaces with the other fluid domains.

When I run the simulation I can see the solid moving but do not get any fluid movement or pressure changes.

I have also run the tutorials without issue.

Any suggestions would be great.

cheers
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Old   May 17, 2010, 00:54
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Carl vance
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Its been a few days and I thought I would bump this thread just in case anyone missed it over the weekend.

All help appreciated.
Thanks
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Old   May 17, 2010, 07:54
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Glenn Horrocks
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Some comments:
* You should use units in your CEL expressions. "rotrpm" should be entered in units of rpm and then the conversion to rad/s is done internally.
* I think your problem may be in using "atstep" is Disp. It should be written in terms of simulations time "t"
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Old   May 25, 2010, 02:57
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Carl vance
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Excellent advise my good man. I will pay closer attention to units from now on.
Getting some useful results now.
Many thanks
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