problem with oscillating cylinder

zonexo

hi,

i'm trying to simulate a cylinder oscillating in a transverse fashion. i've met with some problems which i hope someone can help...

these are the steps i took:

1. read in the mesh

2. prepare the plung.c udf file given as

#include "udf.h" /* this function defines velocity of center of gravity for pure plunging motion*/ /* Plunging motion equation is z(t)=h*sin(2*pi*f*t) */ DEFINE_CG_MOTION(plung, dt, vel, omega, time, dtime) { Thread *t; face_t *f; /*reset velocities */ NV_S(vel,=,0.0); NV_S(omega,=,0.0); if (!Data_Valid_P()) return; /* Get the thread pointer for which this motion is defined */ /* t=DT_THREAD(dt); */ /* vel[1] is the vertical plunging velocity */ /* These velocity below is for h=0.4c and f=0.993Hz */ vel[1] = 2.495*cos(6.2392*time); }

3. compile the source file

4. go to dynamic mesh - zones. i've selected cylinder with rigid body motion with the udf profile just compiled

5. set the BC of the cylinder with moving wall and use the library just compiled.

i wanted to start iteration but the "iterate" button is not highlighted.

so what have i missed out? tks in advance!