Calculation of Pressure and viscous moments separately

zeenia · January 19, 2014, 15:27

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

ghorrocks · January 19, 2014, 17:54

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.

hmasenger · January 20, 2014, 02:55

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?

ghorrocks · January 20, 2014, 04:38

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.

January 20, 2014, 04:38		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	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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January 19, 2014, 17:54		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	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.