Equilibrium uid con gurations for close binary systems can become globally unstable. Instabilities arise from the strong tidal interaction between the two components, which tends to make the e ective two-body potential governing the orbital motion steeper than 1=r. As a result, a circular orbit can become unstable to small radial perturbations. The instability can be either secular or dynamical...

We describe the basic properties and consequences of introducing active stresses, with principal direction along the local director, in cholesteric liquid crystals. The helical ground state is found to be linearly unstable to extensile stresses, without threshold in the limit of infinite system size, whereas contractile stresses are hydrodynamically screened by the cholesteric elasticity to giv...

Equilibrium uid conngurations for close binary systems can become globally unstable. Instabilities arise from the strong tidal interaction between the two components , which tends to make the eeective two-body potential governing the orbital motion steeper than 1=r. As a result, a circular orbit can become unstable to small radial perturbations. The instability can be either secular or dynamica...

The role of Rayleigh-Taylor instabilities (RTI) in layers accelerated by heating with heavy-ion beams is of obvious importance but has received little attention. Owing to the lack of ablative stabilization, it is of special interest to what extent the density gradient can play a stabilizing role. We regard the situation shown in Fig. 1: an absorber region is heated by a beam in order to acceler...

2014 In critical wetting phenomena, the situation of a heavier liquid residing on top of lighter liquid is observed. The consequences of the Rayleigh-Taylor mode of instability in the semicritical wetting layer in a binary liquid mixture are investigated. We also report experimental observations in support of our theory, in the critical binary liquid mixture cyclohexane + acetonitrile. J. Physi...

Microorganisms naturally move in microstructured fluids. Using the simulation method of multi-particle collision dynamics, we study in two dimensions an undulatory Taylor line swimming in a microchannel and in a cubic lattice of obstacles, which represent simple forms of a microstructured environment. In the microchannel the Taylor line swims at an acute angle along a channel wall with a clearl...

The influence of an ambient fluid flow on the fragmentation hot molten tin droplets (initially at 800°C) and cold low melting point alloy 70°C) in water is investigated with high-speed photography flash radiography. accelerated using a converging nozzle to constant speed up 30 m/s double piston arrangement designed eliminate formation shock wave that present most earlier studies. At velocities,...

The evolution of Type Ia supernovae in the surrounding medium is studied using 2-dimensional numerical hydrodynamic simulations. The ejecta are assumed to be described by an exponential density profile, following the work of Dwarkadas & Chevalier (1998). The case of a circumstellar region formed by mass loss from the progenitor or a companion star is also considered. The decelerating contact di...