[fard734]

Dear freinds
The following UDF is just working in "SERIAL" processing option without problem, but in the "PARALLEL" mode, when the Excuted on deman is selected, this error appear"Node 999999: Process 12480: Received signal SIGSEGV. MPI Application rank 0 exited before MPI_Finalize() with status -1
The fl process could not be started. "
The udf is interpreted without any problem, but dosnt work in parallel mode. Please let me know your suggestions.

#include "udf.h"
DEFINE_ON_DEMAND(on_demand_calc)
{
Domain *d; /* declare domain pointer since it is not passed as an
argument to the DEFINE macro */

real R=8.314;
real D=26.1e-6;
float Y_W,X_W,Y_A; "mole fraction and mass fraction of vapor"
float T_cell, P_cell, P_sat,Powsat;
Thread *t;
cell_t c;
d = Get_Domain(2); /* Get the domain using ANSYS Fluent utility */

/* Loop over all cell threads in the domain */
thread_loop_c(t,d)
{


Y_W = C_YI(c,t,0);
Y_A = C_YI(c,t,1);
X_W = (Y_W*29)/((29*Y_W) + (18*Y_A));
T_cell = C_T(c,t); /*cell mixture temperature*/
P_cell = C_P(c,t);
Powsat=(8.07131-1730.63/(233.426+(T_cell-273.15)));
P_sat = pow(10,Powsat)*133.322;

/* Loop over all cells */
begin_c_loop(c,t)
{
C_UDSI(c,t,0) = C_VOF(c,t);
C_UDSI(c,t,1) = C_YI(c,t,0);

C_UDMI(c,t,1)=NV_MAG(C_UDSI_G(c,t,0));
C_UDMI(c,t,2)=NV_MAG(C_UDSI_G(c,t,1));
C_UDMI(c,t,4)= pow(C_VOLUME(c,t),0.66)*3;

if (C_UDMI(c,t,1)>40)
{
C_UDSI(c,t,1)=P_sat/ P_cell;

C_UDMI(c,t,2)=NV_MAG(C_UDSI_G(c,t,1));

C_UDMI(c,t,0)=D*P_cell/(R*T_cell)* C_UDMI(c,t,2)*C_UDMI(c,t,4);
C_UDMI(c,t,5)=D*P_cell/(R*T_cell)* C_UDMI(c,t,2);
}
else
{C_UDMI(c,t,0)=0;}
}
end_c_loop(c,t)




}
}

DEFINE_MASS_TRANSFER(mass_transfer1, c, t, from_phase_index, from_species_index, to_phase_index, to_species_index)
{


float m_lg, T_cell, P_cell, P_sat,Powsat;
float NV_VEC(G);
float X_W, Y_W, Y_A;
float cur_ts;
Thread *w_liq, *gas_mix, *w_gas;
face_t f;
Domain *mix_domain, *pdomain;
int i, pdomain_index;
float area[ND_ND], A, ad, theta, cotan, len;

/******** Define variables *********/
mix_domain = Get_Domain(1);
/* pdomain = DOMAIN_SUB_DOMAIN(mixture_domain,2); */ /* For gas domain */
pdomain_index = 0;
pdomain = DOMAIN_SUB_DOMAIN(mix_domain,pdomain_index);

w_liq = THREAD_SUB_THREAD(t, from_phase_index);
gas_mix = THREAD_SUB_THREAD(t, to_phase_index);
w_gas = THREAD_SUB_THREAD(t, to_species_index);

T_cell = C_T(c,t); /*cell mixture temperature*/
P_cell = C_P(c,t); /*cell mixture pressure*/
m_lg = ABS(C_UDMI(c,t,0));
C_UDMI(c,t,3)=m_lg;
return (m_lg); /* return value of mass transfer rate */
}

[AlexanderZ]

it should work in parallel either.

check again if you've allocated udmi and udsi memories in fluent GUI
you may try to compile udf instead of interpret it.