# Calculation of Pressure and viscous moments separately

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January 19, 2014, 15:27
Calculation of Pressure and viscous moments separately
#1
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Join Date: Jan 2014
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Dear all;
I want to calculate moments on the ship hull (image attached) along z axis with center (3. 6,0,0). I want to get the viscous moments (due to viscous forces) and pressure moments (due to pressure forces) separately. I have used Fluent to do this, but now I want to use CFX for this purpose.
Is there any way to get the viscous and pressure moments separately along z-axis with center (3.6,0,0).
Waiting for a kind response
Attached Images
 Ship Hull.jpg (8.9 KB, 15 views) Calculation of Moments From Fluent Post Processor.jpg (39.6 KB, 22 views)

 January 19, 2014, 17:54 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,091 Rep Power: 109 Use the CEL expressions force() and torque() to return the forces and torques. Have a look in the documentation on the details of the force and torque functions.

January 20, 2014, 02:55
#3
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hamed
Join Date: Apr 2009
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Quote:
 Originally Posted by ghorrocks Use the CEL expressions force() and torque() to return the forces and torques. Have a look in the documentation on the details of the force and torque functions.
I think his problem is with separating viscous shear stress and pressure dependent stress .he made new question for me too!! Do you think is there a way to separate this two kind of force?

 January 20, 2014, 04:38 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,091 Rep Power: 109 Oh sorry, misread the question. There is a post asking this exact question on the CFX forum. Do a search for it. In short you can use CEL expressions to integrate the wall shear to get the viscous moment and pressure to get the pressure moment. hmasenger likes this.

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