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Old   April 20, 2011, 09:15
Default Issue with DEFINE_PROPERTY UDF in 3D
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I'm trying to carry out combustion simulations whereby I change the density based on a normalised temperature (progress variable). In order to do this I created the following DEFINE_PROPERTY UDF

#include "udf.h"

DEFINE_PROPERTY(c_density, c, t)
        real rho, tao, rho_u;

        tao = 6.48;
        rho_u = 1.0261;
        rho = rho_u/(1.0 + tao*C_UDSI(c,t,2));
        return rho;
In 2-D I have no issues with using the above UDF. However, in 3-D in the Solution Initialisation when I select "Compute from all-zones" it gives a segmentation with the following error

Stack backtrace generated for process id 13521 on signal 1 :
Check the file fluenterror.log for details.
Please include this information with any bug report you file on this issue!

Error: fluent.12.1.2 received a fatal signal (SEGMENTATION VIOLATION).
Error Object: #f

Here rho_c refers to my UDF, I don't understand why the problem only occurs in 3D and not in 2D.

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