Simulation of near-wall explosion bubble with non-condensable gas evolution via a modified multicomponent and multiphase lattice Boltzmann model

In the present study, an improved thermal multi-component multiphase (MCMP) lattice Boltzmann model is proposed by introducing a non-orthogonal transformation matrix and multi-range inter- and intra-particle interaction forces to enhance numerical stability. The model successfully captures multiple oscillation cycles of a vapor bubble with non-condensable gas (NCG) and resolves the immiscibility problem between vapor and air commonly observed in macroscopic MCMP bubble models. Additionally, the model is applied to investigate bubble dynamics near a solid wall, with a focus on the effects of NCG content on collapse intensity. Results show that higher NCG content leads to increased initial internal pressure, resulting in a larger maximum radius and prolonged collapse time. However, the compressibility of the bubble during the collapse stage decreases, weakening the collapse strength. The NCG mass inside the bubble exhibits a decrease–increase–decrease trend during the first oscillation cycle, which is influenced by interfacial mass transfer. Besides, the existence of the NCG concentration ensures non-zero vapor content at the bubble’s minimum radius, significantly affecting the phase change behavior during the bubble evolution process.