NUMERICAL CALCULATION METHOD FOR HIGHER ORDER MIXED ELEMENT POISSON SOLVER BASED ON GSMAC FINITE ELEMENT METHOD

摘要

PROBLEM TO BE SOLVED: To accurately perform incompressible fluid analysis with minimum loss of a calculation speed by a computer with a low storage capacity when an analysis area has a complicated shape or when there is strong mutual reaction between fluid and structure in a GSMAC finite element method.;SOLUTION: Using a triangular element and a quadrangular element, a quadric function is used as an interpolation function of speed, while a linear function is used as an interpolation function of pressure. Calculation may be carried out by using a mixed mesh of the triangular element and the quadrangular element. Superior diagonal approximation is carried out on a discretization Poisson equation, and taking a satellite element of a pressure node into consideration, calculation of the speed and pressure is carried out until reaching convergence by a simultaneous relaxation method and time proceeds on the converged result.;COPYRIGHT: (C)2006,JPO&NCIPI