Accession Number : ADA114679

Title :   A Rapid and Accurate Solution for the Poisson Equation with Neumann Boundary Conditions on General Domains.

Descriptive Note : Technical memo.,


Personal Author(s) : Abdallah,S

PDF Url : ADA114679

Report Date : 17 Dec 1981

Pagination or Media Count : 26

Abstract : This memorandum presents a rapid and accurate solution for the Poisson equation with Neumann boundary conditions on general domains. The stream-like function formulation is used to obtain two modified Poisson equations with Dirichlet boundary conditions. The first equation is solved for the flux components of the dependent variable, and are used in calculating Dirichlet boundary conditions for the second Poisson equation. Two integral constraints are to be satisfied in the present formulation. The first constraint is a consequence of Green's first integral theorem and the second constraint is a result of the present analysis. A new procedure is implemented in the boundary conditions to satisfy the second integral constraint. This technique is applied to calculate the static pressure from a Poisson equation with Neumann boundary conditions in the solution of Navier-Stokes equations (velocity pressure formulation). Numerical results for the incompressible viscous flow in a driven cavity are presented and compared with the available numerical results in the literature. (Author)

Descriptors :   *Poisson equation, *Navier Stokes equations, *Dirichlet integral, *Viscous flow, Boundary value problems, Accuracy, Static pressure, Velocity, Integrated systems, Incompressible flow, Cavities

Subject Categories : Numerical Mathematics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE