Accession Number : ADP006059

Title :   On the Numerical Simulation of Three-Dimensional Hypersonic Flow,

Corporate Author : DEUTSCHE FORSCHUNGS- UND VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V GOETTING EN (GERMANY F R)

Personal Author(s) : Riedelbauch, S. ; Wetzel, W. ; Kordulla, W. ; Oertel, H., Jr

Report Date : NOV 1987

Pagination or Media Count : 16

Abstract : A report on the first steps towards the numerical simulation of hypersonic flows. Intentionally, the ideal-gas assumption is used to validate the methods by comparing results with experimentally observed or theoretically obtained data in cold hypersonic flows about simple geometries. The approaches cover the continuum as well as the gas-kinetic flow regime. An implicit finite-difference method with bow-shock fitting is employed to integrate the time-dependent Navier-Stokes equations, while the gas-kinetic flow is simulated by approximations to Boltzmann's equation. The Direct-Simulation Monte-Carlo method is preferred to the Molecular-Dynamics approach because of its larger computational efficiency. Results are compared with experimental data for the laminar flow past a blunted cone at M = 10.6 and past a hemisphere at M = 4.15. The decay of Oseen's vortex at Kn = 0.1, and the gas-kinetic flow past a cylinder at M = 5.48 with Kn = 0.1 and 0.3 have been simulated, and results are shown in comparison with theoretical data. As an application to more realistic configurations the three-dimensional laminar flow past the noise of a typical spacecraft and the gas-kinetic flow in the symmetry plane of the flow past the same configuration is being discussed. The next steps will include real-gas modelling. For hot hypersonic flows experimental data are badly needed for comparison purpose.

Descriptors :   *HYPERSONIC FLOW, *DIGITAL SIMULATION, THREE DIMENSIONAL FLOW, BOW SHOCK, FINITE DIFFERENCE THEORY, NAVIER STOKES EQUATIONS, BOLTZMANN EQUATION, COLD FLOW, LAMINAR FLOW, MONTE CARLO METHOD, VORTICES, SYMPOSIA.

Subject Categories : Fluid Mechanics
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE