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arXiv 2108.03042math.AP
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可压缩流体与三维粘弹性固体相互作用

Compressible fluids interacting with 3D visco-elastic bulk solids

Dominic Breit, Malte Kampschulte, Sebastian Schwarzacher

摘要:

我们考虑三维流固耦合问题的物理设置。粘性可压缩气体或液体与非线性、粘弹性、三维块状固体相互作用。后者是由一个非凸的弹性能量泛函的双曲演化。流体由可压缩Navier-斯托克斯方程模拟,正压压力定律。由于固体的运动,流体域是时变的。我们的主要结果是一个弱解的长期存在的耦合系统,直到碰撞的时间。通过最小化运动的方法建立了两种不同物质运动之间的非线性耦合。固体和流体的运动是通过相对于耗散和静态电位的间接最小化来选择的。这些变分的选择,再加上一个仔细建设的基本流程图,我们的近似,然后直接导致压力梯度和材料的时间导数。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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