Accession Number : ADP001952

Title :   Transonic Small Disturbance Calculations Including Entropy Corrections,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER

Personal Author(s) : Hafez,M. ; Lovell,D.

Report Date : 1980

Pagination or Media Count : 8

Abstract : Murman's fully conservative mixed type finite-difference operators are first modified. A special sonic point operator with an iterative damping term is introduced which helps the convergence and does not affect the spatial conservative differences. Reliable calculations with second order supersonic schemes are obtained using two operators, the regular sonic point operator followed by a first order supersonic scheme. Also, shock point operator is shown to be equivalent to fitting a locally normal shock terminating the supersonic region. The potential calculations are then modified to account for the non-isentropic jump conditions using a simple shock fitting procedure based on Prandtl relation.

Descriptors :   *Transonic flow, Entropy, Finite difference theory, Corrections, Convergence, Shock waves

Distribution Statement : APPROVED FOR PUBLIC RELEASE