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arXiv 1902.07082math.AP
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二维不可压缩理想流体中刚体的动力学

Dynamics of rigid bodies in a two dimensional incompressible perfect fluid

Olivier Glass, Christophe Lacave, Alexandre Munnier, Franck Sueur

摘要:

本文研究了浸入二维不可压缩理想流体中的多个刚体的运动,整个系统由一个不可渗透的外部固定边界所包围。流体运动由不可压缩的欧拉方程描述,刚体的运动由牛顿定律给出,力由流体压力引起。我们证明,对于光滑的解决方案,牛顿方程可以被改写为二阶常微分方程的自由度的刚体与系数取决于流体的涡量和周围的循环的机构,但不再对流体压力。这种重新表述突出了与附加质量效应有关的测地线方面,概括了库塔-儒可夫斯基型升力的陀螺特征,包括通过物体运动引起的势流的物体-物体相互作用,通过物体环流引起的无旋流的物体-物体相互作用,以及物体和流体涡度之间的相互作用。

英文摘要:

We consider the motion of several rigid bodies immersed in a two-dimensional incompress-ible perfect fluid, the whole system being bounded by an external impermeable fixed boundary. The fluid motion is described by the incompressible Euler equations and the motion of the rigid bodies is given by Newton's laws with forces due to the fluid pressure. We prove that, for smooth solutions, Newton's equations can be recast as a second-order ODE for the degrees of freedom of the rigid bodies with coefficients depending on the fluid vorticity and on the circulations around the bodies, but not anymore on the fluid pressure. This reformulation highlights geodesic aspects linked to the added mass effect, gyroscopic features generalizing the Kutta-Joukowski-type lift force, including body-body interactions through the potential flows induced by the bodies' motions, body-body interactions through the irrotational flows induced by the bodies' circulations, and interactions between the bodies and the fluid vorticity.

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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