# Cp (Pressure coefficient) using OpenFOAM

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 July 21, 2012, 22:30 Cp (Pressure coefficient) using OpenFOAM #1 Member   Join Date: Jul 2012 Posts: 66 Rep Power: 7 Hello everyone! I am doing a wind simulation on a membrane. I am interested in the Cp values on the membrane surface... any ideas how to get it? Thank you!

 August 22, 2012, 09:52 #2 Member   Join Date: Apr 2012 Location: France Posts: 72 Rep Power: 7 Hi, I use this thread to ask my question. How can I get this type of pressure coefficient (Cp) graph? (cf. picture) Thanks

 August 30, 2012, 08:16 #3 Member   Join Date: Apr 2012 Location: France Posts: 72 Rep Power: 7 anybody ?

 September 11, 2012, 09:47 #4 Super Moderator     Tobias Holzmann Join Date: Oct 2010 Location: Leoben (Austria) Posts: 1,974 Blog Entries: 6 Rep Power: 33 Pressure coefficent ? Do you mean the lift and drag coefficents? Tobi

 September 12, 2012, 09:30 #5 Member   Join Date: Apr 2012 Location: France Posts: 72 Rep Power: 7 Not really. I have my lift and drag coefficients (Cl and Cd), but I would like to see the distribution of the pressure around the geometry.

 September 26, 2012, 05:29 #6 Member   Join Date: Mar 2009 Posts: 83 Rep Power: 10 You can calculate them very easily inside of paraview. Then they can be display in the same way as any other variable.

 September 26, 2012, 06:03 #7 Member   Join Date: Apr 2012 Location: France Posts: 72 Rep Power: 7 Can you explain me how to do that ? Thanks

September 26, 2012, 08:31
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Quote:
 Originally Posted by Rider Can you explain me how to do that ?

It's very easy. Select the data you want to operate on (the full case, a single surface you have extracted, etc.) Highlight that and click the calculator button, or go
Filters > Alphabetical > Calculator.

You can select point or cell data, and then use it as a normal calculator, using the Scalar/Vector variables available at the bottom. Hit apply and it will calculate.

 November 8, 2012, 09:54 #9 Member   Join Date: Nov 2010 Posts: 62 Rep Power: 9 Hi, I am struggling with a similar issue to Rider, trying to work out the center of pressure for a shape. Search has failed me so far, any advice would be appreciated. Thanks.

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