[zxcvasdf]

Hi
i wanna to simulate a simple 2d case that flow crosses over a plate that is normal to flow and this plate(line in 2d ) will deform by a defined function by me and i want investigate the effect on flow.
for example line will defrom its shape as a parabola or some other function
how can i write udf for this motion?
Thanks

[zxcvasdf]

No one could help me?

[AHF]

Originally Posted by zxcvasdf

Hi
i wanna to simulate a simple 2d case that flow crosses over a plate that is normal to flow and this plate(line in 2d ) will deform by a defined function by me and i want investigate the effect on flow.
for example line will defrom its shape as a parabola or some other function
how can i write udf for this motion?
Thanks

Hi, i guess i know what should you do. you have to use dynamic mesh. use DEFINE_GRID_MOTION micro. pressure deform the plate so read the pressure on the plate and then calculate the new x,y position of each node. then update the node position with some thing like this NODE_Y(v) = y
below is my udf update Y with function, maybe can help you

DEFINE_GRID_MOTION(down,domain,dt,time,dtime)
{
face_t f;
Thread *tf = DT_THREAD((Dynamic_Thread *)dt);
Node *v;
real x ;
real y ;
int n ;

/* set deforming flag on adjacent cell zone */
SET_DEFORMING_THREAD_FLAG(THREAD_T0(tf));

/*Message ("no node update check");*/
begin_f_loop(f,tf)
{
f_node_loop(f,tf,n)
{

v = F_NODE(f,tf,n);
if (NODE_POS_NEED_UPDATE(v))
{
NODE_POS_UPDATED(v);
x = NODE_X(v);
y = 0.005 * sin( ( 100 ) * ( NODE_X(v) - (0.02*time) ) ) ;
NODE_Y(v) = y ;
}

}
Update_Face_Metrics(f,tf);
}
end_f_loop(f,tf);
}