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-   -   Moving a wall with UDF (http://www.cfd-online.com/Forums/fluent/86044-moving-wall-udf.html)

noa March 13, 2011 06:26

Moving a wall with UDF
 
Can you please take a look at this????:confused::confused::mad:


I have a 2D channel that the upper wall has the equation of y=ax+b.

I used a udf in order to move it along Y axis.
However, when I preview my mesh it doesn't take into account the slope of the wall (a*x) :


#include"udf.h"
#include"mem.h"
#include"dynamesh_tools.h"
/* Constants */
#define b 10e-3
#define a 0.3e-3
/************************************************** ***/



DEFINE_GEOM(upper_wall_m,domain,dt,position)
{
Thread *tf = DT_THREAD (dt);
face_t f;
Node *node_p;
real x, y;
int n;

SET_DEFORMING_THREAD_FLAG (THREAD_T0 (tf));

begin_f_loop (f, tf)
{
f_node_loop (f, tf, n)
{
node_p = F_NODE (f, tf, n);
if (NODE_POS_NEED_UPDATE (node_p))
{
NODE_POS_UPDATED (node_p);
x = NODE_X (node_p);

y=-a*(x)+b)+CURRENT_TIME;
NODE_Y (node_p) = y;
}
}
}
end_f_loop (f, tf);
}



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