[OpenFOAM] Signal of the Torque in Paraview

SSSERB13 · August 3, 2021, 20:22

Hello everyone,

I ran an unsteady rotationary CFD case using OF to evaluate the torque and I am using paraview for post-processing. The model is running according to the -Z axis and I am using an equation in Paraview to calculate the torque: cross(F_drag,0iHat+0jHat+0*kHat-coords). The results show three components and the magnitude of the torque. Also, the signal of the Z component is negative. Is this signal aligned with the right-hand rule for the torque? In my case, the orientation (-Z) is clockwise. If the minus signal (-) is related to the right-hand rule, which considers the negative signal regarding the clockwise direction, the results should be right. Do you know if this consideration is valid? Or the minus signal is indicating an incorrect output?

Really appreciate your help.

Regards!

John_P · October 29, 2021, 01:05

From what you describe, yes it sounds like your results are valid.
A pic would make it easier to visualise.
Torque is generally positive in the RHR sense, yes.

August 3, 2021, 20:22	Signal of the Torque in Paraview	#1
SSSERB13 New Member Joel S J Join Date: Aug 2013 Posts: 13 Rep Power: 12	Hello everyone, I ran an unsteady rotationary CFD case using OF to evaluate the torque and I am using paraview for post-processing. The model is running according to the -Z axis and I am using an equation in Paraview to calculate the torque: cross(F_drag,0iHat+0jHat+0*kHat-coords). The results show three components and the magnitude of the torque. Also, the signal of the Z component is negative. Is this signal aligned with the right-hand rule for the torque? In my case, the orientation (-Z) is clockwise. If the minus signal (-) is related to the right-hand rule, which considers the negative signal regarding the clockwise direction, the results should be right. Do you know if this consideration is valid? Or the minus signal is indicating an incorrect output? Really appreciate your help. Regards!

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October 29, 2021, 01:05		#2
John_P New Member John Pitman Join Date: Jan 2020 Posts: 6 Rep Power: 6	From what you describe, yes it sounds like your results are valid. A pic would make it easier to visualise. Torque is generally positive in the RHR sense, yes.