Accession Number : ADA326426

Title :   Numerical Simulation of Turbulent Jets with Rectangular Cross-Section.

Descriptive Note : Contractor rept.,

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

Personal Author(s) : Wilson, Robert V. ; Demuren, Ayodeji O.

PDF Url : ADA326426

Report Date : 1997

Pagination or Media Count : 19

Abstract : Three-dimensional turbulent jets with rectangular cross-section are simulated with a finite-difference numerical method. The full Navier-Stokes equations are solved at low Reynolds numbers, whereas at the high Reynolds numbers filtered forms of the equations are solved along with a subgrid scale model to approximate effects of the unresolved scales. A 2-N storage, third-order Runge-Kutta scheme is used for temporal discretization and a fourth-order compact scheme is used for spatial discretization. Computations are performed for different inlet conditions which represent different types of jet forcing. The phenomenon of axis-switching is observed, and it is confirmed that this is based on self-induction of the vorticity field. Budgets of the mean streamwise velocity show that convection is balanced by gradients of the Reynolds stresses and the pressure.

Descriptors :   *TURBULENT FLOW, *JET FLOW, PRESSURE GRADIENTS, COMPUTERIZED SIMULATION, VORTICES, COMPUTATIONAL FLUID DYNAMICS, FINITE DIFFERENCE THEORY, FLOW FIELDS, NAVIER STOKES EQUATIONS, REYNOLDS NUMBER, RUNGE KUTTA METHOD, DOWNSTREAM FLOW, MOMENTUM TRANSFER, THREE DIMENSIONAL FLOW.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE