Numerical simulations and experiments on physics of high Mach number shockwave -- turbulent flow interactions

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

OSTI ID:6429671

Buckingham, A C ^[1]; Grun, J ^[2]

---

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

When a shock moves into and interacts with an existing turbulent field, a substantial enhancement of the after-shock turbulent intensity and a simultaneous distortion and realignment of the tensor stress rate field and associated tensor stress field results. Component mixing, advective transport, and diffusion, as well as associated momentum and energy dissipation, are intensified over their pre-shocked levels. A combination of low preshocked turbulent intensity and strong shocks (e.g. shock Mach numbers substantially greater than one) produces the most pronounced interactive change in the turbulence level. In contrast, when a weak shock (Mach number only slightly greater than one) moves through relatively intense up turbulence, the turbulence change is modest but dynamical distortion and erratic motion of the shock front is much more pronounced. It is a commonly held view that if the interactive shock Mach number is in the hypersonic range (shock Mach numbers equal to or greater than about 6), rapid reinforcement of shock strength at the front by non-linear pressure field interactions and consequent self-healing of shock front geometric irregularity would act to suppress front distortion and also suppress the influence of the shock interactions on the surrounding turbulence. In the present work, recent experiments, numerical large eddy simulations (LES), and analysis are presented which contradict this notion. This work suggests that pronounced shock front distortion and substantial interactive modification of the turbulence persists even for shocks propagating at shock Mach numbers well in excess of 100

• 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: 6429671
• Report Number(s): UCRL-JC-112287; CONF-9303126--3; ON: DE93013424
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
FLUID FLOW
MACH NUMBER
NUMERICAL SOLUTION
SHOCK WAVES
TURBULENT FLOW
VELOCITY
WAVE PROPAGATION