Learning Forum

[Karl Schoppmann]

Dear all,

my task is to simulate the flow around an obstacle in a 3D domain described by a rectangular box.

boundary conditions: 1x inlet, 1x outlet, 2x symmetry, 2x periodic

surface of obstacle: no-slip wall

 

My question w.r.t. Fluent Meshing (Watertight Geometry):
I want to have a poly-hexcore mesh with polyhedral cells only in the vicinity of the obstacle and hexahedral cells anywhere else upto the domain boundaries.
However, with poly-hexcore volume mesh settings, I get polyhedral cells at the domain boundaries.

Is there any way to get hexahedral cells upto the domain boundaries?

Thanks for your help!

[Rob]

You will, Fluent Meshing adds poly cells and then switches to hexcore away from the surfaces. 

[Karl Schoppmann]

So what can I do that Fluent Meshing creates a hexcore mesh directly at domain boundaries (not switching from poly cells to hexcore)?

I want to have poly cells only around the obstacle, but not at domain boundaries...

[Rob]

You can't, that's how the poly-hexcore mesher works. Is there a reason for not wanting poly cells at the outer regions? 

[Karl Schoppmann]

For domain boundaries with periodic boundary condition and remarkable flow over these boundaries, I prefer to have a structured grid - in particular if the shape of the domain (in my case a rectangular box) allows to have hexcore cells upto the domain boundaries...

[Rob]

You can use Ansys Meshing and decompose the domain, but I generally just use a full poly mesh. 

[Karl Schoppmann]

Ok, thanks!