Fluent.6.2.received a fatal signal (SEGMENTATION )

Jungfeng

Hi, everyone,

I am using fluent.6.2.16 to simulate a deflecting pipe using an UDF as given in FLUENT 6.3 UDF Manual (Chapter 2: P203-P204).

The UDF is compiled as below :

#include "udf.h"

DEFINE_GRID_MOTION(pipe, domian, dt, time, dtime)

{ Thread *tf = DT_THREAD(dt);

face_t f;

Node *node_p;

real NV_VEC(omega), NV_VEC(axis), NV_VEC(dx);

real NV_VEC(origin), NV_VEC(rvec);

real sign;

int n;

sign =5.0*sin(26.178*time);

/* Message ("time = %f, omega = %f\n",time, sign);*/

NV_S(omega, =, 0.0); NV_D(axis,=, 0.0, 1.0, 0.0);

NV_D(origin,=, 0.153, 0.0, 0.0);

begin_f_loop(f,tf)

{

f_node_loop(f, tf, n);

if(NODE_Z(node_p)>=10&&NODE_POS_NEED_UPDATE(node_p ))

{

NODE_POS_UPDATED(node_p);

omega[1]=sign*pow(NODE_Z(node_p)/0.23, 0.5);

NV_VV(rvec, =, NODE_COORD(node_p), -, origin);

NV_CROSS(dx, omega, rvec);

NV_S(dx, *=, dtime);

NV_V(NODE_COORD(node_p), +=, dx);

}

}

end_f_loop(f, tf);

}

Grid check: Domain Extents: x-coordinate [-2.5, 2.5 ];

y-coordinate [-2.5, 2.5];

z-coordinate [0, 100];

The UDF compile correctly! The Dynamic Mesh Zone also defined successfully But , when I use Preview (Mesh Motion)to check the deflection of pipe .The error come up: Fluent.6.2.16 received a fatal signal (SEGMENTATION VIOLATION) Please someone help me find out the mistake in this UDF!

Thanx in advance!