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Drift in Sinusoidal Rigid Body Motion with Two Domains

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Old   September 22, 2012, 03:17
Question Rigid Body Solver Input
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Josh Yen
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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.






Last edited by dae4god; September 23, 2012 at 22:20.
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Old   September 24, 2012, 21:59
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Glenn Horrocks
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This sounds very strange. Can you give more details - what torque numbers are you trying to enter? What are you modelling?
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Old   September 24, 2012, 22:45
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Hi ghorrocks,

I actually started a new thread with a title that was more appropriate to the problem - sorry. The new thread is at Problems with Small Values in the Rigid Body Solver.

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?
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