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simulkade / FVTool

Finite volume toolbox for Matlab/Octave
http://fvt.simulkade.com
BSD 2-Clause "Simplified" License
99 stars 56 forks source link

Size o linear system of equations #22

Closed croquemadame closed 5 years ago

croquemadame commented 5 years ago

I noticed that when specifying 2-D problem with NxNy nodes, the coefficient matrix for the linear system is NxN, with N=(Nx+2)(Ny+2). I would expect something like NxN with N=(Nx+2)*(Ny+2). I understand the two extra points are probably related by implementation of boundary conditions, but I don't quite understand why the coefficient matrix is as large as it is. Please let me know if I am missing out on something fundamental.

croquemadame commented 5 years ago

Ok, one equation per node, (Nx+2)*(Ny+2) equations total. Sorry!