[tirithmina]

How to compile UDF files in Ansys Fluent via MS Visual Studio
https://www.youtube.com/watch?v=Z95B-vk8zMA

Hello
I'm trying to do piston moving in cylinder(vertical moving wall) with using Dynamic mesh, UDF.
I searched and read manual, and I thought it could be done by using DEFINE_CG_MOTION.

Because I want bottom wall(cylinder head face) moving downward(y axis direction), I wrote and compiled this code.
----------------------------------------------------------------
#include "udf.h"

DEFINE_CG_MOTION(movingwall,dt,vel,omega,time,dtim e)
{

NV_S(omega,=,0.0);
vel[0]=0.0;
vel[1]=0.05;
vel[2]=0.0;
Message ("vel[1]=%f \n", vel[1]);
}
---------------------------------------------------------------

But nothing happend when I clicked Display Motion & Preview Mesh Motion.
Any advice for me?
Thank you

[AlexanderZ]

did you hook your function?

Ansys fluent customization manual
look for "Hooking DEFINE_CG_MOTION UDFs" chapter