CFD Online Discussion Forums - Drift in Sinusoidal Rigid Body Motion with Two Domains

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Rigid Body Solver Input

Does anyone know why the CFX Rigid Body solver only accepts Torque values above a certain threshold number? This threshold number also seems to depend on the timestep size.

This sounds very strange. Can you give more details - what torque numbers are you trying to enter? What are you modelling?

Hi ghorrocks,

I actually started a new thread with a title that was more appropriate to the problem - sorry. The new thread is at http://www.cfd-online.com/Forums/cfx...tml#post383433.

My simulation involves rotating a rigid body at very small angular accelerations of the order of $\alpha = 4.18\times 10^{-3} rad s^{-2}$ . However, when I look at the Angular Acceleration Z in one of the CFD-Solver monitors, it shows $\alpha = 0 rad s^{-2}$ .

Do you know why this happens, or how I can rotate my rigid body at small angular accelerations?