Deflated preconditioned conjugate gradient solvers for the Pressure-Poisson equation

  title={Deflated preconditioned conjugate gradient solvers for the Pressure-Poisson equation},
  author={Romain Aubry and Fernando Mut and Rainald L{\"o}hner and Juan R. Cebral},
  journal={J. Comput. Physics},
A deflated preconditioned conjugate gradient technique has been developed for the solution of the Pressure–Poisson equation within an incompressible flow solver. The deflation is done using a region-based decomposition of the unknowns, making it extremely simple to implement. The procedure has shown a considerable reduction in the number of iterations. For grids with large graph-depth the savings exceed an order of magnitude. Furthermore, the technique has shown a remarkable insensitivity to… CONTINUE READING
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