Why moments around center of pressure calculated in ansys fluent is not zero?

babri · September 15, 2016, 17:31

hello , I compute location of center of pressure of my geometry in ansys fluent , as you know the moments around this point should be zero because drag and lift forces are acting at this point , but when I compute the moments around center of pressure it is not zero or near zero! so how to find center of pressure ?
some contour of my geometry attached

sbaffini · October 20, 2016, 06:47

This is a quite common engineering misconception.

https://en.wikipedia.org/wiki/Resultant_force

As explained in the "Torque-free resultant" section, not all system of forces have a so called "center of pressure".

The fact that Fluent computes it "in any case" is just marketing.

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October 20, 2016, 06:47		#2
sbaffini Senior Member Paolo Lampitella Join Date: Mar 2009 Location: Italy Posts: 2,195 Blog Entries: 29 Rep Power: 39	This is a quite common engineering misconception. https://en.wikipedia.org/wiki/Resultant_force As explained in the "Torque-free resultant" section, not all system of forces have a so called "center of pressure". The fact that Fluent computes it "in any case" is just marketing.