udf: volume fraction gradient in eulerian model

jwwang

hi,everyone, I try to use udf to express solid phase pressure,I compile the UDF in FLUENT with no problem, but when I start calculating, FLUENT gives me this: Error: FLUENT received fatal signal (ACCESS_VIOLATION) 1. Note exact events leading to error. 2. Save case/data under new name. 3. Exit program and restart to continue. 4. Report error to your distributor. Error Object: ()

here is my little UDF: #include "udf.h"

DEFINE_SOURCE(y_solid_pressure, cell, thread, dS, eqn) {

real void_s, con, v_s, source=0.0;

void_s = C_VOF(cell, thread);

con = -8.686*(1.0-void_s)+6.385;

if (Data_Valid_P())

v_s = C_VOF_G(cell, thread)[1];//problem is in this sentence

source = pow(10,con)*v_s;

dS[eqn] = 0.0;

return source; }