[bia]

please can you help me i'm runing an unsteady flow around a circular cylinder with a diameter 15 mm for a REYNOLDS number =150 .
first of all when i run this problem without a jet actutator i got DRAG coefficeint =1.45 and LIFT (max = 0.6 ) which is a little bit near to published results before.
but now i'm tryin to restart my calculation after introducing a jet actutator as an oscilatting orifice ic the cylinder using a user defined function ( velocity inlet )
/************************************************** ********************/
/* unsteady.c */
/* UDF for specifying a transient velocity profile boundary condition */
/************************************************** ********************/

#include "udf.h"

DEFINE_PROFILE(unsteady_velocity, thread, position)
{
face_t f;

begin_f_loop(f, thread)
{
real t = RP_Get_Real("flow-time");
F_PROFILE(f, thread, position) = 5.0*sin(10.*t);
}
end_f_loop(f, thread)
}

the grid is chown bellow in the attached file and also the non convergence of drag and lift coeefiecient .
the velocity inlet is 0.1460735 ms-1
walls
cylinder = stationnary wall .
the small part introduced in cavity of the cylinder is the synthetic jet moving with the sinusoidal velocity ( mentionned up (udf ))
i don't nkow what is the problem :'( i'm really stuck there .
i've used as descritisations schemes :
pressure -velocity coupling : simple
pressure : standrad
momentum : first order
please help meeeeeeee