UDF value error when i calculate a log function
 

HI,

I want to calculate a log function.

Here is my UDF file.

(simply example.)

DEFINE_PROPERTY(cell_viscosity, cell, thread)
{
real mu_lam;
real AA;
real defRateMag = C_STRAIN_RATE_MAG(cell, thread);

AA = log(defRateMag);
mu_lam = AA;

return mu_lam;
}

In solution initialization step, i initialize standard and hybrid.

And then, i check the properties -> Molecular Viscosity

That value is 1.#Je+00

I think AA = log(defRateMag) is not calculate.

Someone help me!

Thanks a lot!