Large eddy simulations of shockwave passage through turbulence

Conference · Wed Jul 08 04:00:00 EDT 1992

OSTI ID:6642351

Buckingham, A C

This is a discussion of progress in continuing efforts to understand and predict the influence of shock waves on turbulent fields during shock-turbulence interactions. Observations show that the Reynolds stress tensor magnitude increases. Strong support for tensor amplification is supplied by the sharply distorted strain field localized to the immediate neighborhood of the shock surface. Beyond this there develops a gradual decay to a new more modestly amplified state relative to the pre-shocked level. Practical interest centers on the significantly altered, albeit shock localized, values of post-shock turbulent kinetic energy, transport, component mixing, wall shear, and heat transfer. The first phase of the present work makes use of a direct two dimensional Monte Carlo simulation procedure to examine the influence of upstream turbulence on shock structure and front topography. Linear viscoelastic turbulence response parameters are developed to model the interaction. In the post-shock region, compressible two dimensional large eddy simulations (LES) are applied. Initially a compressibility modified Smagorinsky model with random subgrid scale backscatter is adopted for the non-resolved scales. Favre averaged conservation equations apply to the explicitly resolved scales. 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. Recent developments in two-band dynamic eddy viscosity modeling for the subgrid scales are then examined for improvement of the results of the LES in the near wall region, under the influence of stochastic subgrid scale backscatter, and in the neighborhood of the shock.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6642351
• Report Number(s): UCRL-JC-111080; CONF-930621--; ON: DE92019503
• Country of Publication: United States
• Language: English

Related Subjects

661300 -- Other Aspects of Physical Science-- (1992-)
665000* -- Physics of Condensed Matter-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
CALCULATION METHODS
COMPUTERIZED SIMULATION
CURRENTS
EDDY CURRENTS
ELECTRIC CURRENTS
ENERGY TRANSFER
MONTE CARLO METHOD
SHOCK WAVES
SIMULATION
TURBULENCE
WALLS