[KaushalSumaria]

I am using a DEFINE_SOURCE udf for momentum in x direction. I am using the following UDF. IT is giving out parse error where 'real x[ND_ND]' is defined and then undeclared variable where it encounters x. Any help in this regard is appreciated.

Thank you

#include "udf.h"

#define CON 20.0

DEFINE_SOURCE(momentum_balance, cell, thread, dS, eqn)
{
real source;
cell_t cell;
Thread *cell_thread;
Domain *subdomain;
subdomain = Get_Domain(3);
real x[ND_ND];

/*loop over all cell threads in the secondary phase domain*/
thread_loop_c(cell_thread, subdomain)
{
/*loop over all cells in secondary phase cell threads*/
begin_c_loop_all(cell,cell_thread)
{
C_CENTROID(x,cell,cell_thread)
if (x[0]>(-0.0015)) || x[0]<0.0015)
{
if(C_VOF(cell,cell_thread)>1)
{
thread_loop_c(cell_thread, subdomain)
{
begin_c_loop_all(cell, cell_thread)
{
/* source term */
source = -CON*C_U(cell,thread) + 100;

/* derivative of source term w.r.t. x-velocity. */
dS[eqn] = -CON;
}
end_c_loop_all(cell, cell_threaD)
}
}
}
return source;
//break:
}
end_c_loop_all(cell,cell_thread)
}
}