Learning Forum

[youssef.badran]

Hello,

I am trying to simulate the flow of a liquid inside the mesh shown below. I have applied a rotating boundary condition in Fluent without using a rotating mesh region.

However, I am encountering some issues with the liquid flow, which seem to be related to the mesh and/or the moving boundary.

Do you have any suggestions to help improve the results? Do you think I should use a refined mesh for the teeth and define this region as a rotating mesh zone with a sliding interface to the rest of the mesh?

[Rob]

Set the outer fluid zone to rotate using Mesh Motion (Cell Zone condition - it's the second option). I also hope that's not the mesh you were trying to use! If it was, please have a look at the various meshing courses on Learning. 

[youssef.badran]

Thank you very much for the information !

[youssef.badran]

I watched the following tutorial:

https://www.youtube.com/watch?v=FElQIvgDmLc&list=PLtt6-ZgUFmMKsQ-dh1SjyuiazlB9_aa-E&index=2

Do you think I should mesh the teeth separately using the 'body size' control type in Fluent Meshing, and apply a specific growth rate toward the center of the geometry?

[Rob]

Possibly, try it. I'd probably just use size functions to start with. Have you also read up on sliding mesh?

[youssef.badran]

OK, thank you for your help.

Yes, I read about the sliding mesh approach, and as you suggested, I imposed mesh motion on the outer region—it seems to work.

I'm now working on improving the mesh quality, as you proposed.