
Accession Number : ADP005920
Title : Prediction of BaseFlows,
Corporate Author : OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES CHATILLONSOUSBAGNEUX (FRANCE)
Personal Author(s) : Delery, J.
Report Date : APR 1988
Pagination or Media Count : 72
Abstract : The base region of a missile or a launcher is the seat of complex phenomena which can have important repercussions on vehicle performance. Prediction of these phenomena is of great practical interest for missile design. This paper presents the basic principles underlying most of the methods currently used to compute baseflows. These methods belong essentially to the following three categories: In the inviscid/Viscous Interactive approach, the outer inviscid flow and the viscous regions are computed together and made compatible along a common boundary. In the MultiComponent approach, the flowfield is decomposed into a limited number of regions which are treated by approximate methods and then patched together. This approach has led to the development of a large variety of practical methods which are still routinely used in industry. The most recent approach consists in solving the time averaged NavierStokes equations. Baseflows in the jetoff and jeton situations are now computed by solving the full NavierStokes equations or the thin layer approximation of these equations. Although still costly in computer time and not always in good agreement with experiment because of the difficulty of modeling turbulence in such complex flows, the NavierStokes approach is particularly promising. It appears as the most straightforward way to extend prediction capability to threedimensional flows. Presentation of these approaches is illustrated by applications as well as comparisons with experiment.
Descriptors : *BASE FLOW, *NAVIER STOKES EQUATIONS, GUIDED MISSILES, GUIDED MISSILE LAUNCHERS, THREE DIMENSIONAL FLOW, MATHEMATICAL PREDICTION, COMPUTERIZED SIMULATION, FLOW FIELDS, INVISCID FLOW, VISCOUS FLOW, INTERACTIONS, DECOMPOSITION, APPROXIMATION(MATHEMATICS), FRANCE.
Subject Categories : Fluid Mechanics
Guided Missiles
Distribution Statement : APPROVED FOR PUBLIC RELEASE