Calculate Force at different points in CFX Post

niraj12321 · July 24, 2010, 13:47

Hi,
I am simulating a flow over an aeroplane wing.
I want to find out the Aerodynamic forces at different points on the surface of the wing.

When I use the force calculator Force_X it just gives me the total force on the 2d surface that is my wing.

How do I find force at different points on this surface?

Thanks.

ghorrocks · July 25, 2010, 07:21

There is no force at a point. Only a pressure and shear stress, and resolved over a point it gives zero force.

niraj12321 · July 25, 2010, 12:11

So if I wish to find Aerodynamic forces at different nodes, I basically cant?
Is it possible with FLuent or any other software?

ghorrocks · July 25, 2010, 19:36

If Fluent can do the impossible then maybe fluent can do it.

But seriously, you do not seem to understand what I am saying. Getting the force at a node is not physically meaningful. Only pressure and shear stress is meaningful. When pressure or shear stress is integrated over an area you then get a force.

niraj12321 · July 26, 2010, 13:16

Ohok I get it.
So is there anything that I can calculate at nodes on a surface?

ghorrocks · July 26, 2010, 19:39

Pressure and/or shear stress would be a good start.

July 24, 2010, 13:47	Calculate Force at different points in CFX Post	#1
niraj12321 New Member Niraj Shah Join Date: Jul 2010 Posts: 6 Rep Power: 16	Hi, I am simulating a flow over an aeroplane wing. I want to find out the Aerodynamic forces at different points on the surface of the wing. When I use the force calculator Force_X it just gives me the total force on the 2d surface that is my wing. How do I find force at different points on this surface? Thanks.

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July 25, 2010, 07:21		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	There is no force at a point. Only a pressure and shear stress, and resolved over a point it gives zero force.

July 25, 2010, 12:11		#3
niraj12321 New Member Niraj Shah Join Date: Jul 2010 Posts: 6 Rep Power: 16	So if I wish to find Aerodynamic forces at different nodes, I basically cant? Is it possible with FLuent or any other software?

July 25, 2010, 19:36		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	If Fluent can do the impossible then maybe fluent can do it. But seriously, you do not seem to understand what I am saying. Getting the force at a node is not physically meaningful. Only pressure and shear stress is meaningful. When pressure or shear stress is integrated over an area you then get a force.

July 26, 2010, 13:16		#5
niraj12321 New Member Niraj Shah Join Date: Jul 2010 Posts: 6 Rep Power: 16	Ohok I get it. So is there anything that I can calculate at nodes on a surface?

July 26, 2010, 19:39		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Pressure and/or shear stress would be a good start.