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Navier-Stokes-Fourier fluids interacting with elastic shells. (English) Zbl 1525.76081

This article explores the behavior of a compressible heat-conducting fluid within a dynamic domain. The fluid occupies a torus-like region enclosed by an elastic boundary, whose movement is influenced by the fluid’s actions. The governing system arises as a coupling between the Navier-Stokes-Fourier equation and an equation describing the optimal response of the elastic shell to the forces acting upon it.
The main issue addressed in the article is the fact that the domain, where the Navier-Stokes-Fourier system is considered, is changing in time according to the unknown function. The introductory sections of the article provide a clear overview of the tools and techniques required to analyze this setup, including various compactness and embedding results.
The main theorem then states the existence of a weak solution up to the time where, possibly, the domain approaches a self-intersection or the elastic energy of the shell degenerates. The proof itself is based on two-level approximation: the authors add a viscous term into the continuity equation and they regularize the pressure by an additional term. This approximation is solved by means of the Galerkin approach.

MSC:

76N10 Existence, uniqueness, and regularity theory for compressible fluids and gas dynamics
76N06 Compressible Navier-Stokes equations
74F10 Fluid-solid interactions (including aero- and hydro-elasticity, porosity, etc.)
74K25 Shells
35Q30 Navier-Stokes equations
35Q74 PDEs in connection with mechanics of deformable solids

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