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May 21, 2011, 08:32 |
Totalpressure Ansys
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#1 |
New Member
Niklas
Join Date: Sep 2010
Posts: 7
Rep Power: 15 |
Hello,
i have a problem with the Totalpressure in Ansys-CFX Post. I´ve drawn a Line in the center of my domain and extracted density, velocity and static pressure along this line. I imported the data in excel and calculated the Totapressure by: p_total=p_static + (Density/2)*(Velocity^2) from my fluid mechanics script The problem is, the calculated totalpressure is very far away from the totalpressure extracted from Ansys along the line. What is my mistake? Do i have to calculate the Totalpressure another way because of compression effects? regards Niklas |
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April 9, 2013, 04:57 |
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#2 |
Senior Member
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,208
Rep Power: 26 |
you should use isentropic relations if your case is compressible.
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April 9, 2013, 18:56 |
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#3 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,697
Rep Power: 143 |
Also keep in mind that the density, pressure and velocity variables are interpolated in your exported file, but when you use the total pressure variable in CFX it is calculated directly on the control volumes. This means your calculation will have interpolation errors in it. The CFX reported total pressure is more accurate.
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