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-   -   How to get the total pressure in the UDF? (http://www.cfd-online.com/Forums/fluent-udf/106912-how-get-total-pressure-udf.html)

zgzhai September 12, 2012 05:50

How to get the total pressure in the UDF?
 
Hello all:
My case is incompressible single phase flow, and I want to get the total pressure and static pressure of some nodes. But the C_P could only get the static pressure, but how to get the total pressure in the UDF? Thank you very much.

BTW: i search a very old thread that said the fluent interior data structure. The total pressure is the 'derived' term, not the 'variable'. So it can not be got , should be calculated by 'total pressure = static pressure + operation pressure + 0.5*rho*v*v '. but I find the true case is not like this. I use the PLOT to print out the total pressure, dynamic pressure and static pressure. The total pressure from the PLOT is bigger than the calculated total pressure with the above formula. I guess maybe there is a coefficient before the '0.5*rho*v*v' .

ghost82 September 12, 2012 06:02

Hi,
have you read this thread?
http://www.cfd-online.com/Forums/flu...-pressure.html

zgzhai September 12, 2012 06:15

thanks to ghost82. I have read this thread. But I think the conclusion is not clear. if total pressure = static pressure + operation pressure + dynamic pressure, my question still exists . Thank you again.


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