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Operating Pressure and Cd

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Old   March 25, 2011, 00:36
Default Operating Pressure and Cd
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I notice that if I change the operating pressure it affects the results I get for the drag coefficient. My sources tell me that should not be the case.

I do not understand enough to know why not.

If Cd should be independent of Operating pressure -- any suggestions as to what may be the cause?

Flow over a a rectangular 3-D cylinder
Mach 1.5

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drag, fluent 13.0, operating pressure

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