Accession Number : ADP006061

Title :   A Spatial Marching Technique for the Inviscid Blunt Body Problem,

Corporate Author : CINCINNATI UNIV OH DEPT OF AEROSPACE ENGINEERING AND ENGINEERING MECHANICS

Personal Author(s) : Davis, R. T. ; Blottner, Frederick G.

Report Date : NOV 1987

Pagination or Media Count : 11

Abstract : A technique has been developed for obtaining approximate solutions of the inviscid, hypersonic flow on a blunt body with a spatial marching scheme. The scheme introduces the Vigneron pressure gradient approximation into the momentum equation in the direction along the body surface. The resulting governing equations are hyperbolic. With a specified shock wave these equations are solved at the stagnation steamline with an iteration procedure and are solved in the downstream direction with a marching scheme. The complete Euler equations are solved with the numerical scheme when the flow is supersonic. A global iteration procedure is required to obtain the shock wave location. The approximate results from the spatial marching technique are compared with the complete solution of the Euler equations for flow over a sphere. The two results are shown to be in approximate agreement and the spatial marching technique provides useful engineering predictions while requiring considerable less computational time.

Descriptors :   *HYPERSONIC FLOW, *BLUNT BODIES, INVISCID FLOW, PRESSURE GRADIENTS, HYPERBOLIC DIFFERENTIAL EQUATIONS, SHOCK WAVES, SYMPOSIA.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE