CFD meshing

[harsh3 (harsh)]

Hi everyone,
I am simulation engineer. I generally use Openfoam for my analysis and due to internal needs from my current workplace I am in need to use rhino for meshing. I did see some tutorials on Youtube but I could not get a solid start. Any direction or links which shows how to carry out meshing in rhino would be much appreciated.

[Jakob_v_Schirmeister (Jakob von Schirmeister)]

What Kind of Data do you get and want to Mesh?

What Problems are you facing?

I guess the Tutorials did Help you to get a Mesh? But you dont Like it?

[menno (Menno Deij - van Rijswijk)]

Can you explain more what the mesh is used for? I have limited experience meshing in Rhino for CFD, so may be able to help.

If the mesh is going to be used directly as discretization grid of a flow domain, only very simple geometry will work; Rhino makes meshes that are used for visualization/rendering, not for simulation and other packages are way better at making simulation grids. On the other hand, if the mesh is to be used as the solid boundary in for example snappyHexMesh, the meshes coming from Rhino should - if made with sufficient resolution - work in OpenFOAM.

[encephalon]

i assume you could check grasshopper for remeshing. Rhino itself has Quadremesh which could be interesting for some applications, but grasshopper might offer more. triremesh was introduced some years ago which might be also quite useful. if its just static and it must do nothing other than be a collision object any mesh would do i guess.

Introducing TriRemesh - high quality triangular and hexagonal remeshing and shrink wrapping

Happy New Year everyone! Wishing all of you and your families a healthy and joyful 2021 I’m pleased to share a new tool for fast and robust generation of high quality isotropic triangular meshes (and their duals) from a Brep or mesh input. The resulting meshes consist of triangles with similar edge lengths, angles and areas. [creases] [conformingfleur] [dragon_remesh] [tennyson] [hand_remesh] This will be included in Grasshopper in the next Rhino 7 service release candidate. The n…

[scottd (Scott Davidson)]

One plugin for Rhino.Grasshopper is Butterfly : https://www.youtube.com/watch?v=6meHDZMJp-I

Tool Ladybug Tools | Butterfly

Forum for Butterfly: https://discourse.ladybug.tools/

[harsh3 (harsh)]

Hi @menno apologise for the delay in response. Yes I use open foam and want to create snappy hex mesh

[menno (Menno Deij - van Rijswijk)]

Great, in that case - if your model is closed - you should be able to get a dense enough mesh with Rhino’s mesh command that, when exported to a file that snappyHexMesh can read (STL?), will allow snappyHexMesh to use it as a background solid to snap onto.
Always check that your mesh is closed. There are isolated cases where closed models give meshes that are not closed.

[harsh3 (harsh)]

hi Menno,

thank you so much for your guidance and yes it worked