[abhiramBA]

Hello,
I am trying to simulate the oscillatory motion of an airfoil. I have successfully compiled my udf and the library is also loaded. I do not know what settings I should use in the dynamic mesh. Only the airfoil seems to oscillate and the grid stays as it is.
Also, when I solve, I get an error saying "Update-Dynamic-Mesh failed. Negative cell volume detected."
Kindly guide me through the dynamic meshing.

[hy2049]

Hi, I'm doing the same thing with you. I also met some problems. So would you like to share your files with me and let's figure out the problems together.

[abhiramBA]

Alright!
Here is my grid.

[vasava]

'Negative cell volume' error indicates that you haven't done the 'dynamic mesh' settings properly.

Can you post your settings here? It would help to help.

[vasava]

More over...
1. The mesh/boundary displacement per time step can not be more that the smallest element size of your mesh.
2. The mesh/boundary displacement per time step should be selected so that the minimum quality of the mesh (after update) does not exceed the worst quality of the mesh you have declared.

[hy2049]

Originally Posted by abhiramBA

Alright!
Here is my grid.

Is that better to use an unstructure mesh if we want to use dynamic mesh here?

[vasava]

Originally Posted by hy2049

Is that better to use an unstructure mesh if we want to use dynamic mesh here?

Yes indeed. Using triangular mesh elements would be more appropriate for dynamic mesh.

[poya0070]

Originally Posted by abhiramBA

Hello,
I am trying to simulate the oscillatory motion of an airfoil. I have successfully compiled my udf and the library is also loaded. I do not know what settings I should use in the dynamic mesh. Only the airfoil seems to oscillate and the grid stays as it is.
Also, when I solve, I get an error saying "Update-Dynamic-Mesh failed. Negative cell volume detected."
Kindly guide me through the dynamic meshing.

about this problem i study in fluent lecture that must be to have a skewness less than 0.7 or acceptable(less than 0.9-0.95, i dont know more).
but in my project(same ur project) resolve this notice and problem yet appear(Although in more time step) and in preview mesh motion the quality orthogonal after several time step is less than 0.05. and then error ......

what setting in remeshing and smothing is required to resolve this problem ?

[saif_uzair]

Hi Abhiram ,I am doing the analysis of pitching aerofoil(symmetrical) , about center of the chord can you please help me with the process and udf.
my mail id bourne0619@gmail.com
Thank YOu