The present work analyses theoretically and numerically fire plumes evolving in a two-layer stratified environment. ambient fluid consists of lower cold (heavy) layer an upper warm (light) with sharp interface. plume is controlled by the heat release rate Q. Depending on density interface location, temperatures layers source conditions, can rise indefinitely or be captured stratification. To de...

In this paper, we examine spatio-temporal evolution of free moving drops in a vertically stratified fluid and study the role of stratification on the rise velocity of a single drop, two drops and a swarm of rising drops. Utilizing fully resolved three-dimensional Direct Numerical Simulations (DNS), we discuss the effects of density stratification on the interaction of two drops and microstructu...

The propagation of sound in a density-stratified fluid is examined in an experiment with a tank of salty water whose density increases continuously from the fluid surface to the tank bottom. Measurements of the height dependence of the fluid density are used to calculate the height dependence of the fluid salinity and sound speed. The height-dependent sound speed is then used to calculate the r...

We examine the transmission of small and moderately large internal gravity wavepackets through uniformly and nonuniformly stratified fluids using fully nonlinear numerical simulations. The simulations of finite-amplitude waves in a uniformly stratified fluid show that the weakly nonlinear theory developed for horizontally periodic wavepackets extends well to the dynamics of wavepackets with hor...