What are non-canonical boundaries?
 

Hi,

I'm working on a fluid application involving structured grids and someone asked me about how we handle non-canonical boundaries, can anyone explain to me what they are?

A google search has revealed little and my maths knowledge is a bit rusty. My first guess would be a boundary that can't be represented by the explicit domain resolution? But maybe this just means the dirichlet boundary conditions?

Any help would be appreciated!

Thanks.