Effective thermal conductivity UDF - C_K_EFF??

Craig

Hi, I am modeling heat transfer in a porous media and get a parse error when I work with the macro C_K_EFF. I get a parse error in that line. If I replace with any other arbitrary macro, say C_K_L or C_MU_EFF or whatever I want it compiles fine. Using V6.1.

Anybody have any ideas why this doesn't work? My UDF is below.

#include "udf.h"

DEFINE_PROPERTY(cell_conductivity, cell, thread) { real k_s; real rho = C_R(cell, thread); real u = C_U(cell, thread); real v = C_V(cell, thread); real mu = C_MU_L(cell, thread); real k_gas = C_K_EFF(cell, thread);

k_s=1.613*(4.62+.0001425*rho/mu*sqrt(u*u+v*v))*k_gas;

return k_s; }