[rezvan]

hi,I want to assign a high density (infinity) to a region of my 2D model.
I have writen the following code;

#include "udf.h"
DEFINE_PROPERTY(cell_density, cell, thread)
{
real density;
real grid_y = NODE_Y(cell, threads);
real grid_x = NODE_X(cell, threads);
if ( grid_x >= 30. && grid_x <= 40. )
{
if ( grid_y >= 10. && grid_y <= 20. )
{
density =1000000000;
}
}
}


but I have received the following error:

line 5: macro `NODE_Y' used with too many (2) args

can anyone help me with it?