[zhereal]

Hi,everyone!

I have a minor problem.
how to write π（Pi）in the UDF？

best regards
zhereal

[pakk]

Check the section "Miscellaneous Macros" (3.8 in versions 14.5 and 15.0) of the Fluent UDF manual.

[zhereal]

Thank you,pakk
Now I'm dong a research.It's about 2D airfoil with heaving and pitching motion. I want to use sliding meshes.
my udf is this:


#include "udf.h"
DEFINE_ZONE_MOTION(fmotion,omega,axis,origin,veloc ity,time,dtime)
{
real omegar;
velocity[0]=0.0,velocity[1]=0.5*3.14159265*cos(0.2*3.14159265*time),velocity[2]=0.0;

origin[0]=0.0, origin[1]=time*velocity[1], origin[2]=0.0;
omegar = 0.5*3.14159265*cos(0.2*3.14159265*time);
*omega = omegar;

return;
}



I think "heaving motion" is
velocity[1]=0.5*3.14159265*cos(0.2*3.14159265*time)
and "pitching motion" is
origin[0]=0.0, origin[1]=time*velocity[1], origin[2]=0.0;
omegar = 0.5*3.14159265*cos(0.2*3.14159265*time);

I know it's wrong,But I don't know how to simulate the two motion together.

best regards,
zhereal