Accession Number : ADA290225

Title :   Interaction of Turbulence with Complex Shock Waves.

Descriptive Note : Final technical rept. 1 Jan 92-30 Jun 94,

Corporate Author : STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Moin, Parviz ; Lele, Sanjiva

PDF Url : ADA290225

Report Date : 25 OCT 1994

Pagination or Media Count : 133

Abstract : Linear analysis and direct numerical simulation (DNS) are used to study the interaction of a shock wave with a turbulent flow. Effects central to shock wave/boundary layer interaction are identified and explained. The quantitative importance of the turbulence anisotropy and the shock oblique angle is demonstrated. Drop in Reynolds shear stress across a normal shock is shown. The implication for Reynolds stress models is discussed. The role of dilatational turbulent fluctuations on turbulence amplification is studied in detail. An explanation is suggested for lower amplification reported in wind-tunnel studies. Linear analysis & DNS are used to demonstrate the considerable influence of entropic fluctuations on turbulence evolution across a shock. Positive correlation between u' and T ' suppress amplification while negative correlation enhances it. Invalidity of Morkovin's hypothesis is demonstrated. A high order scheme is developed to allow strong shock/turbulence interaction. Results are presented for isotropic turbulence/normal shock interaction. (AN)

Descriptors :   *SHOCK WAVES, *TURBULENT FLOW, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, LINEAR SYSTEMS, EXPERIMENTAL DATA, ACOUSTIC WAVES, NUMERICAL ANALYSIS, BOUNDARY LAYER, TURBULENCE, EDDIES(FLUID MECHANICS), COMPUTATIONAL FLUID DYNAMICS, CORRELATION, COMPRESSIBLE FLOW, ANISOTROPY, SHEAR STRESSES, KINETIC ENERGY, WIND TUNNEL TESTS, REYNOLDS NUMBER, ENTROPY, MOMENTUM TRANSFER.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE