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Title: Progress in sub-grid scale modeling of shock-turbulence interaction

The authors report on progress in the development of sub grid scale (SGS) closure relationships for the unresolved motion scales in compressible large eddy simulations (LES). At present they are refining the SGS model and overall LES procedure to include: a linearized viscoelastic model for finite thickness shock distortions and shocked turbulence field response; multiple scale asymptotic considerations to improve predictions of average near-wall surface behavior; and a spectral statistical model simulating the effects of high wave number stochastic feed-back from the unresolved SGS nonlinear motion influences on the explicitly resolved grid scale motions. Predicted amplification levels, modal energy partition, shock translational to turbulence kinetic energy transfer, and viscoelastic spatio-temporal response of turbulence to shock interaction are examined in comparison with available experimental evidence. Supplemental hypersonic compressible turbulence experimental information is developed from sub nanosecond interval pulsed shadowgraph evidence of laser impulse generated hypervelocity shocks interacting with intense, previously developed and carefully characterized initial turbulence. Accurate description of the influence of shock-turbulence interactions is vital for predicting their influence on: Supersonic/hypersonic flow field analysis, aerodynamic design, and aerostructural materials selection. Practical applications also include interior supersonic combustion analysis and combustion chamber design. It is also the essential foundation for accuratelymore » predicting the development and evolution of flow-field generated thermal and electromagnetic radiation important to hypersonic flight vehicle survivability, detection and communication.« less
Authors:
 [1] ;  [2]
  1. Lawrence Livermore National Lab., CA (United States). Center for Advanced Fluid Dynamics Applications
  2. Naval Research Lab., Washington, DC (United States). Plasma Physics Div.
Publication Date:
OSTI Identifier:
106519
Report Number(s):
UCRL-ID--119453
ON: DE95017859; TRN: AHC29525%%17
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Dec 1994
Research Org:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 33 ADVANCED PROPULSION SYSTEMS; SHOCK WAVES; INTERACTIONS; FLOW MODELS; TURBULENT FLOW; COMPRESSIBLE FLOW; RESPONSE FUNCTIONS; SUPERSONIC TRANSPORT; HYPERSONIC FLOW; COMBUSTION WAVES; COMBUSTION CHAMBERS; HEAT TRANSFER; EXPERIMENTAL DATA