DYNAMICS OF LOCALIZED TRAVELING WAVE CONVECTION IN BINARY FLUID MIXTURE

The dynamical behavior of a localized traveling wave (LTW) in a binary fluid layer heated from below confined in a rectangular cell with the intermediate aspect ratio г=12 and the separation ratio φ=-0.11 is studied by using the two-dimensional numerical simulation of the full hydrodynamic equations. We find that a counterpropa gating wave (CPW) occurs at the onset of convection and is modulated in space-time. The modulated traveling wave (MTW) plays an important role in the transition to the LTW state, and the LTW state depends on the fluid parameters and exists in a narrow interval of the reduced Rayleigb number. The transition from LTW to an extended traveling wave (ETW) or stationary overturning convection (SOC) state occurs when r exceeds a certain critical value. Our results agree with those observed in experiments.