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Referring to a time independent partial differential equation of the form $\nabla^2u=f$

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I have a 3D solver for the incompressible Navier-Stokes equations which uses a FFT library for the Poisson equation with a uniform grid on all directions. In 2D the Poisson equation is given by … : $$ p_{xx} + p_{yy} = f_{rhs} $$ When using a non-uniform grid, we usually map the domain to a computational space where the grid is uniform. Let $x = x(\xi), y = y(\eta)$. The Poisson equation on the …
asked Jan 22 '18 by user26633