2021/08/06 by Dominic Breit, Breit, Dominic, Malte Kampschulte +3 · 2 citations
Engineering · Mathematics · #Analysis of PDEs (math.AP) #Barotropic fluid #Classical mechanics #Compressibility #Compressible flow #Computational Fluid Dynamics and Aerodynamics #Dissipative system #Domain (mathematical analysis) #FOS: Mathematics #Gas Dynamics and Kinetic Theory #Mathematical analysis #Mathematics #Mechanics #Navier-Stokes equation solutions #Nonlinear system #Physics #Thermodynamics #Viscous liquid #math.AP
paper · pdf · doi:10.48550/arxiv.2108.03042
published in arXiv (Cornell University) (Cornell University)
arxiv created 2021/08/06 · openalex publication_date 2021/08/06 · arxiv updated 2021/08/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We consider the physical setup of a three-dimensional fluid-structure interaction problem. A viscous compressible gas or liquid interacts with a nonlinear, visco-elastic, three-dimensional bulk solid. The latter is described by a hyperbolic evolution with a non-convex elastic energy functional. The fluid is modelled by the compressible Navier--Stokes equations with a barotropic pressure law. Due to the motion of the solid, the fluid domain is time-changing. Our main result is the long-time existence of a weak solution to the coupled system until the time of a collision. The nonlinear coupling between the motions of the two different matters is established via the method of minimising movements. The motion of both the solid and the fluid is chosen via an incrimental minimization with respect to dissipative and static potentials. These variational choices together with a careful construction of an underlying flow map for our approximation then directly result in the pressure gradient and the material time derivatives.