Accession Number : ADA294377

Title :   Numerical Studies of Turbulent Free Surface Flows and Unsteady Propeller Flows.

Descriptive Note : Final rept. 1 Jan 90-31 Mar 95,

Corporate Author : CAMBRIDGE HYDRODYNAMICS INC PRINCETON NJ

Personal Author(s) : Orszag, Steven A. ; Borue, Vadim ; Staroselsky, Ilya ; Zhang, Yansi

PDF Url : ADA294377

Report Date : 31 MAR 1995

Pagination or Media Count : 62

Abstract : Two main problems have been studied, viz. the structure of turbulence near a free surface and the Reynolds-averaged solution of unsteady propeller/hydrofoil flows by the renormalization group (RNG) two-equation turbulence transport model. A variety of free-surface turbulence simulations demonstrate the key modifications in turbulence structure due to the free surface. In addition, we determine the modifications in surface wave spectra due to the turbulence beneath the free surface as typically represented by a renormalized dispersion relation. The results for unsteady hydrofoils show the power of the RNO method in robustly and accurately treating large-scale unsteady and transitional flows, a marked improvement over previous turbulence transport models. (AN)

Descriptors :   *TURBULENCE, *UNSTEADY FLOW, *NAVIER STOKES EQUATIONS, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, SURFACE WAVES, TURBULENT FLOW, EDDIES(FLUID MECHANICS), COMPUTATIONAL FLUID DYNAMICS, WAKE, NUMERICAL METHODS AND PROCEDURES, VISCOSITY, REYNOLDS NUMBER, GAS SURFACE INTERACTIONS, SKIN FRICTION, PROPELLERS, DISPERSION RELATIONS, HYDROFOILS.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE