[moloykb]

Dear all,
I am trying to simulate the flow through a artery in the presence of stenosis with surface irregularities. The artery wall is assumed to oscillate with a velocity of sinusoidal variation. In order to define the motion of the wall I am using the Dynamic mesh feature of Fluent with the following compiled udf to define the motion of the wall.

#include "udf.h"

DEFINE_CG_MOTION(wave, dt, vel, omega, time, dtime)
{
vel[1]=-.0001*7.543*sin(7.543*time);
}
For the unsteady simulation I am using a time step size of 0.0001 sec and as a mesh method I am using Layering approach with a split and collapse factor of 0.4 and zone type as rigid body.
But unfortunately when I try to run the simulation it shows the error Update-dynamic mesh failed: negative cell volume detected.
Please help me.