[Taltan]

I am a bit confused as to what the difference between these boundary conditions are. Any help would be appreciated. My take on these BC's:

1) SymmetryPlane

Mirrors along a plane so to reduce the amount of cells needed for a full model. For instance you have a model of a car, then you would only need to compute half of the car as the other half is symmetric.

2) Cyclic

Looping back information from one bc to another. For instance a pipe, where the outlet loops back to the inlet.

3) Wedge

This is the one I am the least confident about. Apparently this is only for 2D simulations for axisymmetric problems, for instance a pipe. But I though (hoped) that it was a way to reduce amount of cells in an axisymmetric 3D problem where you would only need to model a fraction of the pipe.

In the case I am working on I have a pipe which is axisymmetric with about 4 million cells and I wish to reduce this amount. Intuitively the wedge approach seemed good as I would only need the mesh for a small section of the pipe. However if this is only for 2D then my simulation would probably fall apart as I intend to model LES.

So hopefully the symmetryPlane approach would work in my case perhaps? Where I would revolve my pipe only 180 degrees and use symmetryPlane bc on the resulting flat surface.