The program package FEATFLOW is both a user oriented as well as a general purpose subroutine system for the numerical solution of the incompressible Navier-Stokes equations in two and three space dimensions.
FeatFlow (Finite Element Analysis Toolbox for Flow) is a finite element CFD Fortran code using a very efficient FEM discretization together with a geometric multigrid approach for solving linear systems. This results in a very fast and computationally efficient solver, typically yielding a magnitude or more of speedup compared commercially available solvers. FeatFlow can be used from MATLAB with the FEATool Multiphysics GUI interface.
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