The convection-diffusion of gas bubbles in a liquid is modeled by a fully coupled Lagrangian approach in which the liquid flow is simulated by a traditional SPH scheme while the trajectories of the particles in the bubbly phase are directly tracked in time. Two families of particles (SPH liquid particles and gas bubbles) are defined. The momentum exchange between the bubbles and the surrounding fluid is taken into account by a suitable kernel approximation centered either in a bubble or in a SPH particle. Therefore, the motion of a liquid particle depends also on the reaction forces (such as drag and lift) exerted on it by the gas bubbles included in its domain of influence. Preliminary tests (which do not account for bubble-bubble interactions) have been performed by simulating an horizontal gas-liquid jet deflected by the interaction with the bubbly phase and the bubble-driven flow in a column. The results confirm the validity of the implemented approach for the simulation of the coupled liquid-gas system.
SPH modelling of two-phase bubbly flows
TORTI, EMANUELA;SIBILLA, STEFANO
2012-01-01
Abstract
The convection-diffusion of gas bubbles in a liquid is modeled by a fully coupled Lagrangian approach in which the liquid flow is simulated by a traditional SPH scheme while the trajectories of the particles in the bubbly phase are directly tracked in time. Two families of particles (SPH liquid particles and gas bubbles) are defined. The momentum exchange between the bubbles and the surrounding fluid is taken into account by a suitable kernel approximation centered either in a bubble or in a SPH particle. Therefore, the motion of a liquid particle depends also on the reaction forces (such as drag and lift) exerted on it by the gas bubbles included in its domain of influence. Preliminary tests (which do not account for bubble-bubble interactions) have been performed by simulating an horizontal gas-liquid jet deflected by the interaction with the bubbly phase and the bubble-driven flow in a column. The results confirm the validity of the implemented approach for the simulation of the coupled liquid-gas system.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
