Accession Number : ADA296512

Title :   Coarsening Strategies for Unstructured Multigrid Techniques With Application to Anisotropic Problems.

Descriptive Note : Contract rept.,

Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s) : Morano, E. ; Mavriplis, D. J. ; Venkatakrishnan, V.

PDF Url : ADA296512

Report Date : MAY 1995

Pagination or Media Count : 20

Abstract : Over the years, multigrid has been demonstrated as an efficient technique for solving inviscid flow problems. However, for viscous flows, convergence rates often degrade. This is generally due to the required use of stretched meshes (i.e. the aspect-ratio AR = delta(y)/delta(x) << 1) in order to capture the boundary layer near the body. Usual techniques for generating a sequence of grids that produce proper convergence rates on isotropic meshes are not adequate for stretched meshes. This work focuses on the solution of Laplace's equation, discretized through a Galerkin finite-element formulation on unstructured stretched triangular meshes. A coarsening strategy is proposed and results are discussed. (AN)

Descriptors :   *GRIDS, *MESH, *LAPLACE TRANSFORMATION, MATHEMATICAL MODELS, ALGORITHMS, OPTIMIZATION, TWO DIMENSIONAL, FINITE ELEMENT ANALYSIS, EFFICIENCY, BOUNDARY LAYER, COMPUTATIONAL FLUID DYNAMICS, PROBLEM SOLVING, SOLUTIONS(GENERAL), ANISOTROPY, ISOTROPISM, CONVERGENCE, NAVIER STOKES EQUATIONS, INVISCID FLOW, VISCOUS FLOW.

Subject Categories : Operations Research
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE