# Flapping wing along inclined hovering (Flaping wing) Dynamic mesh

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May 12, 2016, 06:32
Flapping wing along inclined hovering (Flaping wing) Dynamic mesh
#1
Member

Arun raj.S
Join Date: Jul 2011
Posts: 72
Rep Power: 7
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

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)
Attached Images
 Domain.jpg (63.3 KB, 13 views) Mesh and dynamic mesh settings.jpg (144.5 KB, 14 views)
Attached Files
 second.c (1.1 KB, 6 views)

May 14, 2016, 02:59
Steps followed for flapping wing and interface error
#2
Member

Arun raj.S
Join Date: Jul 2011
Posts: 72
Rep Power: 7
Hi everyone,

I have tried so many times but not able to succeed. So I have prepared a pdf (as followed in the below link) containing all the steps I followed for my simulation. I have attached my UDF also. Kindly someone let me know the reason why this is happening Thank you once again.

Attached Files
 second.c (1.1 KB, 4 views)

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