Accession Number : ADA194166

Title :   An Efficient Patched Grid Navier-Stokes Solution for Multiple Bodies. Phase 1.

Descriptive Note : Rept. no. 1 (Final),

Corporate Author : SCIENTIFIC RESEARCH ASSOCIATES INC GLASTONBURY CT

Personal Author(s) : Chan, Y T ; Weinberg, Bernard C

PDF Url : ADA194166

Report Date : 03 Feb 1988

Pagination or Media Count : 32

Abstract : A major problem area in current computational fluid dynamics technology concerns flows about complex configurations formed by multiple components in relative motion. Major difficulties encountered in such problems are those associated with the grid. For such applications, the geometric constraints of the component elements often require that patched grids be employed. Herein, a novel and efficient procedure is described to solve the time-dependent, multidimensional Navier-Stokes equations about multiple body configurations. In contrast to existing patched grid approaches, the present method calculates the entire flow field over both grids simultaneously, without iteration. By eliminating iteration within a time step and allowing time steps to be chosen by accuracy considerations, rather than by stability limits, this procedure could lead to a substantial savings in computer run time. In addition, for steady state problems improved convergence rates could be expected. To demonstrate the capabilities and advantages of the new procedure, a problem of current interest in turbomachinery, the flow field in a rotor-stator stage, is investigated using the developed procedure. A steady state flow field about a cascade of displaced tandem Joukowski airfoils is considered. The accuracy of the calculations and CPT time used are compared with a calculation using a continuous deformed grid algorithm and a patched grid with iteration.

Descriptors :   *DEFORMATION, *GRIDS, *MOTION, *NAVIER STOKES EQUATIONS, ACCURACY, ALGORITHMS, CONFIGURATIONS, CONVERGENCE, EFFICIENCY, FLOW FIELDS, LIMITATIONS, PARTS, RATES, ROTORS, SOLUTIONS(GENERAL), STABILITY, STATORS, STEADY FLOW, STEADY STATE, TURBOMACHINERY

Subject Categories : Numerical Mathematics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE