[arunraj]

Hi everyone,

I am simualting dragonfly motion. I want to use structured mesh around the aerfoil. But i did so many tries but I am not able to succeed using CG-MOTION. It is mainly due to the interface. Shadow of the interface (interface2) stays in the same place but the other interface move with the inner body. Both interface and shadow are not moving together. Please let me know what is the problem. I can give all the details u want.

I am using smoothing, remeshing for the outer domain. My udf is working but I dont knw what to do at the interface.

Smoothing = 0, remeshing accourding to mesh size. I followed the instructions in the tutorial. I dont know how he did, but this video shows that in fluent we can use dynamic mesh and interface

https://www.youtube.com/watch?v=01hOD68DxrM

x(t) = (Ao/2)*(1+cos(2*pi*f*t)*(cos(beta))
y)(t) = (Ao/2)*(1+cos(2*pi*f*t)*(sin(beta))
alpha(t) = alphao+B sin(2*pi*f*t)
Ao=2.5 cm
B=pi/4
alphao=pi/4
f=40 Hz
beta = 60 degree


I have differentiated the above function and applied in the udf

vel[0] = - A0/2 * 2*pi*f*cos(beta)*sin(2*pi*f*t)
vel[1] = - A0/2 * 2*pi*f*sin(beta)*sin(2*pi*f*t)
omega[2]= B *2*pi*f*cos(2*pi*f)