Accession Number : ADA301994

Title :   A Far-Field Non-Reflecting Boundary Condition for Two-Dimensional Wake Flows.

Descriptive Note : Contract rept.,

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

Personal Author(s) : Danowitz, Jeffrey S. ; Abarbanel, Saul A. ; Turkel, Eli

PDF Url : ADA301994

Report Date : SEP 1995

Pagination or Media Count : 35

Abstract : Far-field boundary conditions for external flow problems have been developed based upon long-wave perturbations of linearized flow equations about a steady state far field solution. The boundary improves convergence to steady state in single-grid temporal integration schemes using both regular-time-stepping and local-time-stepping. The far-field boundary may be near the trailing edge of the body which significantly reduces the number of grid points, and therefore the computational time, in the numerical calculation. In addition the solution produced is smoother in the far-field than when using extrapolation conditions. The boundary condition maintains the convergence rate to steady state in schemes utilizing multignd acceleration. (AN)

Descriptors :   *WAKE, *TWO DIMENSIONAL FLOW, *VISCOUS FLOW, MATHEMATICAL MODELS, STEADY STATE, TIME DEPENDENCE, GRIDS, COMPUTATIONAL FLUID DYNAMICS, FAR FIELD, COMPRESSIBLE FLOW, FLOW FIELDS, NUMERICAL INTEGRATION, CONVERGENCE, PERTURBATIONS, SUBSONIC FLOW, NAVIER STOKES EQUATIONS, LAMINAR FLOW, INCOMPRESSIBLE FLOW, BOUNDARY LAYER FLOW, TRAILING EDGES, EXTRAPOLATION, SMOOTHING(MATHEMATICS).

Subject Categories : Fluid Mechanics
      Numerical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE