Accession Number : ADA322310

Title :   Numerical Studies of Low-Density Two-Dimensional Hypersonic Flows by Using the Navier-Stokes and Burnett Equations with Nonequilibrium Real Gas Effects.

Descriptive Note : Final rept. 15 Nov 93-14 Nov 96,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF MECHANICAL AEROSPACE AND NUCLEAR ENGINEER ING

Personal Author(s) : Zhong, Xiaolin

PDF Url : ADA322310

Report Date : 24 JAN 1997

Pagination or Media Count : 33

Abstract : The goal of this research is to study the laminar turbulent transition and other transient flow phenomena of 3-D chemically reacting hypersonic boundary layers by direct numerical simulation (DNS) and by linear stability analysis. The research in the report period was focused on developing new numerical methods for such studies and studying several fundamental transient hypersonic flow phenomena. First, several new efficient and high-order accurate numerical methods for DNS of 3-D hypersonic reacting boundary layers and for computing unsteady hypersonic flows with complex shock interactions were developed. These new methods were developed in order to overcome difficulties associated with the direct numerical simulation of hypersonic flows. Second, several studies on the stability phenomena of hypersonic boundary layers over blunt leading edges both by direct numerical simulation and by linear stability analyses were performed. Also completed were extensive numerical studies on real gas effects on a steady shock/boundary layer interaction and a self-sustained unsteady shock-shock interference heating flows. Third, the effects of using Burnett equations for rarefied hypersonic flow computations were investigated. With the completion of the bulk of work on the development of new numerical methods for complex hypersonic flow simulation, the DNS studies are currently being extended to 3-D hypersonic boundary layer transition over elliptic cross section cones.

Descriptors :   *BOUNDARY LAYER TRANSITION, *DIGITAL SIMULATION, INTERACTIONS, SHOCK WAVES, SHOCK, LEADING EDGES, NONEQUILIBRIUM FLOW, TWO DIMENSIONAL FLOW, UNSTEADY FLOW, LAMINAR FLOW, CONICAL BODIES, BLUNT BODIES, HYPERSONIC FLOW, RAREFACTION.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE