R. Ishizaki et al., INSTABILITY OF A CONTACT SURFACE DRIVEN BY A NONUNIFORM SHOCK-WAVE, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 53(6), 1996, pp. 5592-5595
Stability of a uniform contact surface is investigated in the case whe
n a nonuniform shock wave passes through the surface, The nonuniform s
hock is, generated by a rippled piston that moves with constant veloci
ty. The amplitude of the shock oscillates and decreases as it propagat
es. A uniform contact surface is found to be unstable after the nonuni
form shock passes across it. The growth rate depends sensitively on th
e phase of the oscillating shock wave at the time when the shock hits
the contact surface. The physical mechanism of the instability is qual
itatively discussed. The linear and nonlinear evolutions of the instab
ility are studied. In particular, the dependence of the linear case on
the Atwood number for a weak shock is investigated. Properties of thi
s stability are found to exhibit differences from those of the standar
d Richtmyer-Meshkov instability in both the linear and nonlinear cases
.