Investigation of Cavitation Bubble Cloud with Discrete Lagrangian Tracking

Here, to study more about the mechanism of the cavitating bubble cloud, we simulate numerically microbubble cloud inside bulk fluid with Lagrangian tracking. The bubble-flow mixture is modelled in a two-way coupled Eulerian-Lagrangian scheme, continuum description of the bulk fluid with discrete Lagrangian tracking of the gas bubbles. The Euler equations are solved based on the multi-resolution conservative compressible fluid method. Dynamics of the dispersed cavitating gas bubbles is modelled in a Lagrangian framework, describing the bubble location and bubble size variation. The sub-grid interface is allowed to diffuse on the computational cells around it within the kernel width. To close the system, the equations of state (EOS) of liquid-gas mixture are given in a stiff gas equation of state, along with one isobaric closure of the pressure. Stability and accuracy of the interface are studied by some classical cases. Pressure perturbation induced by the bubble cloud inside flow is simulated based on two-way coupling framework.