[leaxey]

I am designing a wankel engine within the scope of a project and I want to use ansys fluent to analyse this engine.

In order to rotate the rotor of the wankel engine in the body, I found a UDF on the forum and made changes according to my own engine. However, the UDF does not work correctly. Although the rotor rotates in the body at the speed I set, I have some problems with translation and therefore the rotor goes out of the body.

I would be very happy if there is someone who can help with this issue.

The UDF I use:

[CODE]#include "udf.h"
#define r 0.0011 /*Eccentricity*/
#define k 57.2727 /*rad to degree*/
#define w 0.001 /*rad/sec*/

DEFINE_CG_MOTION(rotor, dt, vel, omega, time, dtime)
{
real beta;

NV_S(vel, =, 0.0);
NV_S(omega, =, 0.0);

omega[2] = 0.001;
beta = 0.003;

vel[0] = -beta * r * cos(beta * time);
vel[1] = beta * r * sin(beta * time);
vel[2] = 0;

}

Body Center: https://hizliresim.com/jthkp21

The rotor moves out of the body:

https://hizliresim.com/4a5a6gc