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can user define a location dependent density in Define_property udf macro?

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Old   January 18, 2019, 16:11
Default can user define a location dependent density in Define_property udf macro?
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Peter Maroul
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Hello all;

Can anyone describe me if the user is able to define the viscosity or density as a function of location by UDf writing in Define_proprties macro?

For example :

suppose :

\rho =1000+0.00001x+0.00001y\

How can the user implement this function in FLUENT?

Thanks a lot for any answer.

P.Maroul
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Old   January 21, 2019, 08:23
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The Fluent manual shows how to make it depend on temperature. The example reads temperature as
Code:
real T = C_T(c,t);
If instead of temperature you want the coordinates, then just use the coordinate:
Code:
real xc[ND_ND];
C_CENTROID(xc,c,t);
Now, the x-coordinate is stored as xc[0], and the y-coordinate as xc[1]. So your equation would become
Code:
1000+0.00001*cx[0]+0.00001*cx[1]
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Old   January 21, 2019, 16:34
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Peter Maroul
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Thank you Sir for your kind help.

That worked excellent.

Good Luck and best wishes.
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