I am quite new to UDF coding/C-programming. I found a UDF example for rotation as shown below but i cant tell what the value of the speed is in RPM or rad/s.
udfexample.c
DEFINE_CG_MOTION (rotation_udf_45, dt, vel, omega, time, dtime)
{
real pi = 3.141592;
real omega_constant = 100*pi/180;
omega[2] = omega_constant;
}
thanks for your help.
Hi Onwuka Osinachi ! If you need to rotate walls or volume of liquid, you don't need UDF. If it so, I'll help you.
For example, you need to go to the boundary conditions of the wall, then select the angular velocity of rotation and the axis of rotation of the wall.
@ Volodimir Brazhenko, thank you for your answer. I have actually tried that but the wall doesn't seem to rotate. I am using a multiphase VOF model, hence i decided to use dynamic mesh.
@ Onwuka Osinachi. I don't use a dynamic grid, but my walls rotate. Try to change the coefficient 1 before X, Y, Z in the boundary conditions of the wall. By the way, if you research gas and speed in the calculation is small, you will not notice the rotation of the walls. In this case, look at the vector velocity field on the walls.
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