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Help! Why C_T_G does not work in my DEFINE_ADJUST udf

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Old   June 30, 2013, 22:14
Default Help! Why C_T_G does not work in my DEFINE_ADJUST udf
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CZ
Join Date: Jun 2013
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Hello,

Can some Fluent experts here please help me find out why C_T_G does not work in this DEFINE_ADJUST function?

I have enabled the "Keep temporary memory from being freed" option.

The code compiles fine, but the computation iteration would collapse.

I know it is the problem with C_T_G because I have tested by replacing C_T_G by another term, and everything works out fine.

I would highly appreciate your help!

CZ

#include "udf.h"
#include "mem.h"
#include "math.h"

DEFINE_ADJUST(Disperions_before_Del,d)
{
real vel, Re, cosalfa,sinalfa, Pr,kXX, kYY,Tgrad_x,Tgrad_r;
real poros=0.93;
real fila_d=0.0006;
Thread *t;
cell_t c;

if (!Data_Valid_P())
return;

thread_loop_c(t,d)
{if (FLUID_THREAD_P(t))
{
begin_c_loop_int(c,t)
{ vel=sqrt(C_U(c,t)*C_U(c,t)+C_V(c,t)*C_V(c,t));

if (vel==0)
{
cosalfa=1;
sinalfa=0;
}
else
{
cosalfa=C_U(c,t)/vel;
sinalfa=C_V(c,t)/vel;
}

Re=C_R(c,t)*vel*fila_d/C_MU_L(c,t);
Pr=C_CP(c,t)*C_MU_L(c,t)/C_K_L(c,t);

if (Re*Pr<10)
{
kXX=C_K_L(c,t)*0.022*Re*Pr*Re*Pr/(1-poros);
kYY=C_K_L(c,t)*0.022*pow(Re*Pr,1.7)/pow((1-poros),0.25);
}

else
{
kXX=C_K_L(c,t)*2.7*Re*Pr/sqrt(poros);
kYY=C_K_L(c,t)*0.052*sqrt(1-poros)*Re*Pr;
}

if (!Data_Valid_P())
return;
Tgrad_x=C_T_G(c,t)[0];
Tgrad_r=C_T_G(c,t)[1];


C_UDSI(c,t,1)=kXX*cosalfa*Tgrad_x + kXX*sinalfa*Tgrad_r;
C_UDSI(c,t,2)=-kYY*sinalfa*Tgrad_x + kYY*cosalfa*Tgrad_r;
/* just for testing purpose, which shows the problem is with C_T_G
C_UDSI(c,t,1)=kXX*cosalfa + kXX*sinalfa;
C_UDSI(c,t,2)=-kYY*sinalfa + kYY*cosalfa;*/
}
end_c_loop_int(c,t)
}
}
}
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Old   June 30, 2013, 23:33
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CZ
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looks like I just found a solution:

temperature gradient problem in udf
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