LEAST-SQUARES SOLUTION OF INCOMPRESSIBLE NAVIER-STOKES EQUATIONS WITH THE P-VERSION OF FINITE-ELEMENTS

A p-version of the least-squares finite element method, based on the velocity-pressure-vorticity formulation, is developed for solving steady-state incompressible viscous flow problems. The resulting system of symmetric and positive definite linear equations can be solved satisfactorily with the conjugate gradient method. In conjunction with the use of rapid operator application which avoids the formation of both element and global matrices, it is possible to achieve a highly compact and efficient solution scheme for the incompressible Navier-Stokes equations. Numerical results are presented for two-dimensional flow over a backward-facing step. The effectiveness of simple outflow boundary conditions is also demonstrated.