Accession Number : ADA316776

Title :   Application of an Upwind High Resolution Finite-Differencing Scheme and Multigrid Method in Steady-State Incompressible Flow Simulations.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD HYDROMECHANICS DIRECT ORATE

Personal Author(s) : Yang, Cheng I. ; Guo, Yanhu ; Liu, C. H.

PDF Url : ADA316776

Report Date : JUN 1996

Pagination or Media Count : 36

Abstract : The analysis and design of a submarine propulsor requires the ability to predict the characteristics of both laminar and turbulent flows to a higher degree of accuracy. This report presents results of certain benchmark computations based on an upwind, high-resolution, finite-differencing Navier-Stokes solver. The purpose of the computations is to evaluate the ability, the accuracy and the performance of the solver in the simulation of detailed features of viscous flows. Features of interest include flow separation and reattachment, surface pressure and skin fiction distributions. Those features are particularly relevant to the propulsor analysis. Test cases with a wide range of Reynolds numbers are selected; therefore, the effects of the convective and the diffusive terms of the solver can be evaluated separately. Test cases include flows over bluff bodies, such as circular cylinders and spheres, at various low Reynolds numbers, flows over a flat plate with and without turbulence effects, and turbulent flows over axisymmetric bodies with and without propulsor effects. Finally, to enhance the iterative solution procedure, a full approximation scheme V-cycle multigrid method is implemented. Preliminary results indicate that the method significantly reduces the computational effort.

Descriptors :   *TURBULENT FLOW, *NAVIER STOKES EQUATIONS, *LAMINAR FLOW, *INCOMPRESSIBLE FLOW, COMPUTERIZED SIMULATION, STEADY STATE, HYDRODYNAMIC CHARACTERISTICS, ACCURACY, COMPUTATIONAL FLUID DYNAMICS, HIGH RESOLUTION, FINITE DIFFERENCE THEORY, WAKE, HYDRODYNAMIC CODES, COMPUTER PROGRAM VERIFICATION, INVISCID FLOW, VISCOUS FLOW, SUBMARINES, FLOW SEPARATION, PRESSURE DISTRIBUTION, REYNOLDS NUMBER, SKIN FRICTION, UNDERWATER PROPULSION, COMPUTER BENCHMARKING.

Subject Categories : Fluid Mechanics
      Computer Programming and Software
      Submarine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE