Project Title:

Two-Equation Turbulence Modeling of Hypersonic Transitional Flows with the UPS

02.01-1427
NAS2-13176
Two-Equation Turbulence Modeling of
	Hypersonic Transitional Flows with the UPS
	Code
Applied and Theoretical Mechanics, Inc.
	4501 Sequoyah Road
	Oakland, CA 94605
		Joelle M. Champney
(415-635-1427)

Abstract:

	The project seeks to improve the ability of turbulence models to solve transition
and turbulence phenomena in the hypersonic regime. The state-of-the-art UPS computer
code, developed at NASA Ames Research Center, will be the basic numerical tool. Two-equation
turbulence models, upgraded by a transition model, will be incorporated into the
UPS code in a "loosely" coupled manner. The transition model, based upon the production
term modification (PTM) developed by Schmidt and Patankar for low speed flows, will
be extended to hypersonic flows. The transition model will determine onset and end
of transition; no such hypersonic transitional model exists at the present time.
The PTM technique includes two constants that will be adjusted using empirical correlations
for onset and end of transition for hypersonic flows over cones. The model will be
tested by predicting transition processes and comparing them with transition experiments
for hypersonic flows over cones at Mach numbers of 6 and 8.

Potential Commercial Application:

Potential Commercial Applications: This work will provide a numerical tool to predict
the important transitional processes on hypersonic aircraft and will improve the
numerical design process presently used by industry.