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RPM (+/-) thumb rule

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Old   November 6, 2007, 00:36
Default RPM (+/-) thumb rule
  #1
studentCFD
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hello guys!

While defining angular velocity to any mesh,what is the thumb rule?

Suppose im looking from the negative z and i want the geometry to revolve around z,say in negative y direction(as can be seen in gui),then while defining rpm,it will be positive or negative?

help required.thanks.
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Old   November 6, 2007, 06:19
Default Re: RPM (+/-) thumb rule
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Glenn Horrocks
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Hi,

The thumb rule is if you want the rotation to be in the direction your fingers point then your thumb points in the vector which represents that rotation. In a right hand coordinate system (CFX and most of the world uses a right hand coordinate system) you use your right hand for this.

This is high school level mathematics. I hope this is not new to you - if it is then I fear CFD will be beyond you for a little while yet.

Glenn Horrocks
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