[shingala]

Dear Fluent Users,

Does it make any sense to use 'Hexcore' method of meshing in fluent, if the hexahedral cells are not aligned with the flow direction?

Hexcore Method: where Hexahedral cells are generated in core volume and tetrahedral in boundaries

I am attaching a one structure mesh example where it makes sense that the hexahedral are aligned with flow direction, where second hybrid mesh created in fluent, where hexahedral cells are not aligned, rather it aligned with respact to either X, Y or Z cordinates.

[LuckyTran]

Regarding the structured mesh, it is aligned with the body surface and is not always aligned with the flow. Nonetheless, it is a nice mesh.


It is very common to use a hex grid not aligned with the flow because they wouldn't always be aligned with the flow anyway. The importance is to minimize the number of low quality cells in your mesh. Hence, I would not use a bunch of locally oriented hex blocks and then have spiderman come in and hold them together like so. I would just use a global hex mesh all aligned in a direction that looks nice overall. If you had the option, you would make a structured mesh like the one shown, not because it is locally aligned with the flow (because it is not) but because it has few cells of poor quality.

[shingala]

ahh okay thanks. Actually I want to compare simulation result for both case struvtured mesh and hybrid (hex+tetrahedron). In Fluent meshing mode there is not great flexibility (I dont know the trick may be) to refine local volume mesh for example near trailing edge and that's why I have to use this box type local refinement feature, which is not helping in giving a good agreement between both case.