rotating reference frame
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? Thanks! phsieh2005 
Re: rotating reference frame
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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