Accession Number:

ADA071689

Title:

A Computational Model for Three-Dimensional Incompressible Wall Jets with Large Cross Flow

Descriptive Note:

Final rept. 19 Sep 1977-18 Sep 1978

Corporate Author:

ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s):

• Murphy, W. D.
• Shankar, V.
• Malmuth, N.

Report Date:

1978-09-01

Pagination or Media Count:

118.0

Abstract:

The flow field of three dimensional incompressible wall jets prototypic of thrust augmenting ejectors with large cross flow is solved using a very efficient centered-Euler scheme in an orthogonal curvilinear coordinate system. The computational model treats initial conditions with arbitrary velocity profiles at or downstream of the jet exit. An averaging approach is employed for the first few marching steps to overcome spurious numerical oscillations associated with arbitrary initial profiles. Laminar as well as turbulent wall jets are simulated. Turbulence is introduced using a two layer mixing length model appropriate to curved three-dimensional wall jets. Typical results quantifying jet spreading, jet growth, nominal separation and jet shrink effects due to cross flow are presented.

Descriptors:

• *BOUNDARY VALUE PROBLEMS
• *JET FLOW
• *THREE DIMENSIONAL FLOW
• PRESSURE GRADIENTS
• COMPUTER PROGRAMS
• PROGRAMMING MANUALS
• MATHEMATICAL MODELS
• FINITE DIFFERENCE THEORY
• PARTIAL DIFFERENTIAL EQUATIONS
• WALLS
• VISCOUS FLOW
• INCOMPRESSIBLE FLOW
• VERTICAL TAKEOFF AIRCRAFT
• CROSS FLOW
• THRUST AUGMENTATION
• EJECTORS
• POWERED LIFT

Subject Categories:

• VSTOL
• Numerical Mathematics
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE