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arXiv 2211.03080math.AP
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关于流体-刚体相互作用问题弱解的正则性

On the regularity of weak solutions to the fluid-rigid body interaction problem

Boris Muha, Šárka Nečasová, Ana Radošević

AI总结:

本文研究三维流体-刚体相互作用问题,将 Navier-Stokes 方程的 Prodi-Serrin 正则性准则推广到流体-刚体系统,证明满足该条件的弱解具有 $W^{2,p}$ 和 $W^{1,p}$ 正则性,并在刚体加速度几乎处处有界时得到 $C^{\infty}$ 光滑性。

摘要:

我们研究一个三维流体-刚体相互作用问题。流体流动由三维不可压缩 Navier-Stokes 方程控制,而刚体的运动由描述线动量和角动量守恒的常微分方程组描述。我们的目标是证明任何满足特定正则性条件的弱解都是光滑的。这是对三维不可压缩 Navier-Stokes 方程经典结果的推广,该经典结果表明,额外满足 Prodi-Serrin $L^r$-$L^s$ 条件的弱解是光滑的。我们证明,在流体-刚体情形下,Prodi-Serrin 条件分别蕴含流体速度和流体压力的 $W^{2,p}$ 和 $W^{1,p}$ 正则性。此外,我们证明,如果额外假设刚体加速度在时间变量上几乎处处有界,则解是 $C^{\infty}$ 的。

英文摘要:

We study a 3D fluid-rigid body interaction problem. The fluid flow is governed by 3D incompressible Navier-Stokes equations, while the motion of the rigid body is described by a system of ordinary differential equations describing conservation of linear and angular momentum. Our aim is to prove that any weak solution satisfying certain regularity conditions is smooth. This is a generalization of the classical result for the $3D$ incompressible Navier-Stokes equations, which says that a weak solution that additionally satisfy Prodi - Serrin $L^r-L^s$ condition is smooth. We show that in the case of fluid - rigid body the Prodi - Serrin conditions imply $W^{2,p}$ and $W^{1,p}$ regularity for the fluid velocity and fluid pressure, respectively. Moreover, we show that solutions are $C^{\infty}$ if additionally we assume that the rigid body acceleration is bounded almost anywhere in time variable.

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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