unsteady flow

faruk

My problem is that with this udf I have parabolic velocity inlet but later it suddenly became smooth if can you help me

#include "udf.h"

DEFINE_PROFILE(inlet_xv_sinusoidal, /* function name */

thread, /* thread */

position) /* variable number */ { face_t f; real flow_time = RP_Get_Real("flow-time");

real x[ND_ND]; /* this will hold the position vector */

real y;

begin_f_loop (f,thread)

{

F_CENTROID(x,f,thread);

y = x[1];

F_PROFILE(f,thread,position) = (0.68 + sin(6.28*flow_time))- y*y/(1.5*1.5)*0.68;

} end_f_loop (f,thread) }