CFD Online Discussion Forums - Issue with DEFINE

Hi,

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

Code:

#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

Code:

==============================================================================

Stack backtrace generated for process id 13521 on signal 1 :

/usr/ansys_inc/v121/fluent/fluent12.1.2/lnamd64/3ddp/fluent.12.1.2[0x12c759d]

/usr/ansys_inc/v121/fluent/fluent12.1.2/lnamd64/3ddp/fluent.12.1.2[0x12c7aa3]

/lib64/libpthread.so.0[0x7f4c4c24da90]

rho_c/lnamd64/3ddp/libudf.so(c_density+0x12)[0x7f4c4b1ab34e]

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.

Thanks.