Problem in compiling property(density) UDF

satish2968

Hi Fluent Users,

I have great difficulty in figuring out my problem.

i had written a property udf for density which follows isentropic law:

p/rho^gamma= constant; actually my problem is to predict compressibility effects in incompressible flow through obstruction type flow meters.

so the compressible fluid in incompressible flow follows a isentropic law and it's udf is:

#include "udf.h" DEFINE_PROPERTY(cell_density,cell,thread)

{

real density; real pressure = C_P(cell,thread); density = pow((pressure/80756.35),1.0/1.4); return density;

}

value 80756.35 is equal to initial pressure/initial denisty^1.4

101325/1.176^1.4=80756.35 during the flow from inlet to outlet density has to vary with respect to pressure variation following isentropic law

libudf was successfully built

loaded successfully

when i am trying to initialise the solution from inlet

it is showing fatal error access voilation

please help me anybody my project thesis is depends on this problem.