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Density for calculating Force Coefficients

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Old   September 16, 2005, 11:53
Default Density for calculating Force Coefficients
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ste_lakey
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I am plotting force and moment coefficients on an aerofoil in a transient simulation, as user points in CFX-solve. Currently these are based on expressions I have inputted into CFX-pre, eg

Fx=force_x()@aerofoil=> gives the force on the surface

CFx=Fx/(0.5*Rho*U*S) => gives the force coefficient With these I specify the density value for Rho beforehand in CFX-Pre. However, is there any way I can assign the value for Rho as the flow density say over the inlet boundary, rather than as a value I specify?

Thanks in advance
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Old   September 16, 2005, 14:27
Default Re: Density for calculating Force Coefficients
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Rui
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Hi,

I'm not sure this is what you want, but you can create an expression for Rho: Rho = areaAve(Density)@inlet.

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Old   September 19, 2005, 04:35
Default Re: Density for calculating Force Coefficients
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ste_lakey
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Thanks Rui, thats just what I'm after
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