Can anyone check what's wrong with this UDF. When I interpreted it with FLUENT, a syntax error was reported in the third line.

#include "udf.h" #define QM 5e-6 DEFINE_SOURCE(charge_density,c,t,dS,eqn) { real charge_density; cell_t c; charge_density=C_R(c,t)*QM; return charge-density; }

Hi Josh

You don't have to declare cell_t c explicitly in your udf as it is already passed to DEFINE_SOURCE. Maybe this redefinition causes the problem. Max