Pseudospectral solution of the two-dimensional Navier-Stokes equations in a disk

An efficient and accurate algorithm for solving the two-dimensional(2D) inc ompressible Navier-Stokes equations on a disk with no-slip boundary conditi ons is described. The vorticity-stream function formulation of these equati ons is used, and spatially the vorticity and stream functions are expressed as Fourier-Chebyshev expansions. The Poisson and Helmholtz equations which arise from the implicit-explicit time marching scheme are solved as banded systems using a post-conditioned spectral tau-method. The polar coordinate singularity is handled by expanding fields radially over the entire diamet er using a parity modified Chebyshev series and building partial regularity into the vorticity. The no-slip boundary condition is enforced by transfer ring one of the two boundary conditions imposed on the stream function onto the vorticity via a solvability constraint. Significant gains in run times were realized by parallelizing the code in message passage interface (MPI) .