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-   -   Density for calculating Force Coefficients (http://www.cfd-online.com/Forums/cfx/21623-density-calculating-force-coefficients.html)

ste_lakey September 16, 2005 11:53

Density for calculating Force Coefficients
 
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

Rui September 16, 2005 14:27

Re: Density for calculating Force Coefficients
 
Hi,

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


ste_lakey September 19, 2005 04:35

Re: Density for calculating Force Coefficients
 
Thanks Rui, thats just what I'm after


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