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Old   April 4, 2006, 17:36
Default rotating reference frame
Pei-Ying Hsieh
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Hi, dear cfd experts:

To compute flow in rotating reference frame, centrifugal force and coriolis force are added into the mementum equation.

For constant rotational speed, omega,

centrifugal force = omega X (omega X r) (where r is postion vector). coriolis force = -2m(omega X U)

What if omega varies with time? Is there any extra force term needed to be added into mementum eq?


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Old   April 5, 2006, 08:54
Default Re: rotating reference frame
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You will also have a term composed of the time derivative of omega crossed with the position vector. It has the same sign as all the other noninertial terms.
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