[kokicar vesolja]

Hello!


I already did my fair share of googling and now I ran out of word phrases to search.



I have a plane made out of 3 separate parts: fuselage (body with wings), ailerons and elevators in wind tunnel - they do not touch i.e do not have any shared edges or faces. Since mesh is pretty detailed and it needs to be for accurate results, it takes a lot of time to snappyHexMesh.


Is it possible to snappyHexMesh a plane, do the foaming and then snappyHexMesh just the elevators under different angle to already existing mesh of a plane and not the whole plane again with elevators under different angle?


Or in other words: if I had snappyHexMesh-ed a sphere and wanted to add another sphere somewhere in the mesh, would I have to snappyHexMesh the whole thing or can I just "append" the sphere to already existing mesh?



Thank you for your answers.

[kandelabr]

This would be possible with mesh movement, that is AMI or overset mesh. The first is possible if you're able to put the moving parts in a cylinder without touching the stationary part of the mesh so you can rotate them freely. The other does not have this requirement but is a bit more exotic. Neither of those two methods require any remeshing.

[kokicar vesolja]

If I understand correctly, I'd move the elevators to a different angle during the simulation?


To do something like: have a plane with elevators at 10°, snappyHexMesh, run the solver and then remesh just the elevators at 20°, and again run the solver, this wouldn't be possible?

[kandelabr]

It's perfectly possible.
Imagine you're simulating a pump, there's a fixed part and a rotating part. Those are separate meshes connected via AMI/NCC.
You can make a simulation where impeller rotates during simulation itself or you can prepare a frozen rotor simulation where impeller is fixed.

Your case would be the latter, fixed domain/fuselage/wings and a separately meshed elevators. You'd connect those two parts into a single mesh, set the angle in advance, then run the simulation. For a different angle, just rotate the elevators - not remesh - and run again.