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decreasing volume of solid area with time step

hello

I'm new in udf so please help me to learn
i want to reform a solid domain with time step in 2D

which my fluid area is a 16*16 mm Square and my solid domain is 2*2
Square in middle of fluid area.
so i want to reform to decreasing solid area volume with time step.

this is my udf but i think there is some problems, my code doesn't compile in fluent.

i want to read every cell in every time step and decrease voulume of all cells of domain.
thanks for your help.

#include "udf.h"

DEFINE_GEOM(solid,domain,dt,position)
{
real vol,vol2;

Domain *domain;
Thread *c_thread;
thread_loop_c(c_thread, domain) /*loops over all cell threads in domain*/
{

cell_t c;
Thread*t;
vol=C_VOLUME(c,t);
if (vol<=0) vol2=0;
if (vol>0) vol2=vol-0.01*vol;
position[0]=vol2;
}

position[1]=position[0];
}

Code:

#include "udf.h"



DEFINE_GEOM(solid,domain,dt,position)

{

real vol,vol2;

cell_t c;

Thread *t = DT_THREAD (dt);

thread_loop_c(t, domain) /*loops over all cell threads in domain*/

{

begin_c_loop(c, t)

{

vol=C_VOLUME(c,t);

if (vol<=0) vol2=0;

if (vol>0) vol2=vol-0.01*vol;

position[0]=vol2;

}

end_c_loop(c, t);

}

position[1]=position[0];

}

Quote:

Originally Posted by AlexanderZ (Post 747088)

Code:

#include "udf.h"



DEFINE_GEOM(solid,domain,dt,position)

{

real vol,vol2;

cell_t c;

Thread *t = DT_THREAD (dt);

thread_loop_c(t, domain) /*loops over all cell threads in domain*/

{

begin_c_loop(c, t)

{

vol=C_VOLUME(c,t);

if (vol<=0) vol2=0;

if (vol>0) vol2=vol-0.01*vol;

position[0]=vol2;

}

end_c_loop(c, t);

}

position[1]=position[0];

 }

Thanks for your reply
i'm wonder how can i change the code for reading all faces area in a cell groups and changing those faces area.