Modeling for Collapsing Cavitation Bubble near Rough Solid Wall by Mulit-Relaxation-Time Pseudopotential Lattice Boltzmann Model

Abstract

Cavitation bubble collapse near rough solid wall is modeled by the multi-relaxation-time (MRT) pseudopotential lattice Boltzmann (LB) model. The modified forcing scheme, which can achieve LB model's thermodynamic consistency by tuning a parameter related with the particle interaction range, is adopted to achieve desired stability and density ratio. The bubble collapse near rough solid wall was simulated by the improved MRT pseudopotential LB model. The mechanism of bubble collapse is studied by investigating the bubble profiles, pressure field and velocity field evolution. The eroding effects of collapsing bubble are analyzed in details. It is found that the process and the effect of the interaction between bubble collapse and rough solid wall are affected seriously by the geometry of solid boundary. At the same time, it demonstrates that the MRT pseudopotential LB model is a potential tool for the investigation of the interaction mechanism between the collapsing bubble and complex geometry boundary.

Modeling of Hydrodynamic Cavitation Reactors: Reflections on Present Status and Path Forward

“…Key approaches may be broadly grouped as (a) onedimensional models based on Rayleigh-Plasset equations or their variants (for example, Pandit et al 4 ); (b) multidimensional CFD based models. Several different approaches like volume of fluid (for example, Orthaber et al 41 ), smooth particle hydrodynamics (for example, Patinõ-Narinõ et al 42 ), and lattice Boltzman (for example, Shan et al 43 ) have been used for simulating multidimensional cavity collapse simulations. Some attempts are also made using molecular dynamics (Wei et al 44 ).…”

“…The PPLB approach naturally captures phase separation and interface formation/collapse without requiring front tracking methods (Chen et al 68 ) and therefore may have the potential to realize a breakthrough in understanding inception, growth, and collapse of cavities. Su et al 69 and Shan et al 43 have used the PPLB approach to carry out threedimensional simulations of collapsing cavities. Recently, Trummler et al 70 used full 3D CFD simulations using the VOF approach to understand the influence of nearby surfaces (either rigid or flexible) on cavity collapse.…”