Sub-grid scale modeling for large eddy simulations in analysis of shock-turbulence interactions

Conference · Tue Dec 01 04:00:00 EST 1992

OSTI ID:10157569

Buckingham, A C ^[1]; Grun, J ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Naval Research Lab., Washington, DC (United States)

We continue to study the influence of dynamic shock wave interactions on turbulence. The interactions may significantly increase turbulent energy and Reynolds stress. Strong support for tensor amplification is supplied by the sharp, transiently distorted strain field in the immediate neighborhood of the shock. Beyond this there develops a gradual decay to a new, more modestly amplified state relative to the pre-shocked level. Practical interest is centered on the significantly altered, albeit shock localized, post-shock turbulent kinetic energy, eddy transport, eddy component mixing and diffusion, wall shear, and heat transfer. In the shock interaction and post-shock region, compressible two dimensional large eddy simulations (LES) are applied. A compressibility modified Smagorinsky model is adapted to represent the non-resolved sub-grid scales. Favre mass-weighted average space and time discretized compressible Navier-Stokes equations are used to represent the explicitly resolved grid scale motions. Predicted amplification levels, modal energy partition, shock translational to turbulence kinetic energy transfer, and viscoelastic response of turbulence to shock interaction are examined in comparison with available experimental evidence. A two-band dynamic eddy viscosity model representing the unresolved subgrid scale field is a possible replacement for the Smagorinsky model. Improvement is sought for predictions in the near wall region, under the influence of stochastic subgrid scale backscatter, and in the neighborhood of the shock. Wall-bounded supersonic compression comer flow experiments and hypersonic cylindrical shock wave turbulence interaction experiments are used as trial cases for test and comparison of the two classes of subgrid scale models.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Department of Defense, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10157569
• Report Number(s): UCRL-JC--112286; CONF-930785--1; ON: DE93013425
• Country of Publication: United States
• Language: English

Related Subjects

661300
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
99 GENERAL AND MISCELLANEOUS
990200
AMPLIFICATION
COMPUTERIZED SIMULATION
FLOW MODELS
FLUID MECHANICS
MACH NUMBER
MATHEMATICS AND COMPUTERS
NAVIER-STOKES EQUATIONS
OTHER ASPECTS OF PHYSICAL SCIENCE
PLASMA
REYNOLDS NUMBER
SHOCK WAVES
TURBULENCE
TURBULENT FLOW
TWO-DIMENSIONAL CALCULATIONS