Global weak solutions to compressible Navier-Stokes-Vlasov-Boltzmann systems for spray dynamics

TL;DR

This paper proves the existence of global weak solutions for a coupled system of equations modeling spray dynamics, combining compressible fluid flow with particle evolution, extending previous mathematical techniques.

Contribution

It establishes the global existence of weak solutions for the coupled Navier-Stokes and Vlasov-Boltzmann system, including the renormalized mass equation for spray droplets.

Findings

Existence of finite energy weak solutions confirmed.

Gas density satisfies the renormalized mass equation.

Extension of techniques from incompressible to compressible fluid-kinetic systems.

Abstract

This work concerns the global existence of the weak solutions to a system of partial differential equations modeling the evolution of particles in the fluid. That system is given by a coupling between the standard isentropic compressible Navier-Stokes equations for the macroscopic description of a gas fluid flow, and a Vlasov-Boltzmann type equation governing the evolution of spray droplets modeled as particles with varying radius. We establish the existence of global weak solutions with finite energy, whose density of gas satisfies the renormalized mass equation. The proof, is partially motivated by the work of Feireisl- Novotny-Petzeltov on the weak solutions of the compressible Navier-Stokes equations coupled to the kinetic problem for the spray droplets extending the techniques of Legger and Vasseur developed for the incompressible fluid-kinetic system.