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Showing results 1 to 10 of 10 Search took 0.00 seconds. Search: Posts Made By: Greg Givogue

Forum: OpenFOAM Post-Processing July 19, 2011, 08:38

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue I'm not sure if I understand what you're trying... I'm not sure if I understand what you're trying to say. The moment arm (or radius as you call it?) is just r= CP-Datum and then the moment = r x F. What software are you using? I'm using...

Forum: OpenFOAM Post-Processing July 18, 2011, 22:10

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue http://www.cfd-online.com/Forums/main/88098-center... http://www.cfd-online.com/Forums/main/88098-center-pressure-body.html#post316275 Hope this helps a bit. Greg

Forum: OpenFOAM Post-Processing May 8, 2011, 23:17

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue Mx=-Fy*z+Fz*y My=Fx*z-Fz*x Mz=-Fx*y+Fy*x ... Mx=-Fy*z+Fz*y My=Fx*z-Fz*x Mz=-Fx*y+Fy*x It turns out that the above equations in matrix form reveal that they are singular (i.e., one or more equations are not independent). inv(A) does not...

Forum: OpenFOAM Post-Processing April 28, 2011, 23:39

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue The reason why the pressure force found using... The reason why the pressure force found using patchIntegrate and the forces utility are different is because the fluid density was set to 1.225 in the forces utility while the patchIntegrate used a...

Forum: OpenFOAM Post-Processing April 27, 2011, 08:19

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue Ok, I've added a few lines in Forces.C to... Ok, I've added a few lines in Forces.C to calculate CP, however, I'm not sure what needs to be done to the Forces.H file. How do I define the variable 'CP' in the .H file? Here's what I've added...

Forum: OpenFOAM Post-Processing April 27, 2011, 08:18

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue No problem. No problem.

Forum: OpenFOAM Post-Processing April 24, 2011, 21:21

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue Thanks for the suggestion but that is for... Thanks for the suggestion but that is for coefficient of pressure and not center of pressure. Center of pressure(CP) is bit more involved because it involves the position of each cell (x) on the...

Forum: OpenFOAM Post-Processing April 24, 2011, 15:54

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue Interesting finding: The forces utility... Interesting finding: The forces utility gives the following result for pressure forces on the body -431.2195 7.0978491 364.73453 If I use patchIntegrate command on the body I get the...

Forum: OpenFOAM Post-Processing April 24, 2011, 15:13

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue Ok this is how the centre of pressure coordinates... Ok this is how the centre of pressure coordinates (x,y,z) are related to a 3D body. Mx=-Fy*z+Fz*y My=Fx*z-Fz*x Mz=-Fx*y+Fy*x Simple enough - 3 equations and 3 unknowns. Can someone tell me...

Forum: OpenFOAM Post-Processing April 14, 2011, 09:02

Replies: 15 Center of Pressure for an Aero Body Views: 16,195 Posted By Greg Givogue Center of Pressure for an Aero Body Hi Everyone! Does a center of pressure(CP) utility exist in OpenFOAM? I have not been able to find anything. Secondly, does anyone know how to manipulate the fields in order to determine CP as...

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