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arXiv 1506.04860math-phmath.CAmath.MPphysics.class-ph
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刚体动力学欧拉方程物理经典解的不存在性

Non-existence of Physical Classical Solutions to Euler's Equations of Rigid Body Dynamics

Mark Wilkinson

摘要:

我们证明了,对于任意的初始数据,一个不能构建的全球时间物理经典解的连续刚体力学的欧拉方程组时,组成的刚体不是完美的球。所谓“物理”解,我们指的是那些保持任何给定初始数据的总线动量、角动量和动能守恒的解。缺乏经典解的原因是由于不存在速度散射图,该速度散射图以这样的方式解决两个非球形刚体之间的碰撞:(i)它们不相互穿透,并且(ii)物体的总线动量、角动量和动能通过碰撞守恒。特别地,这意味着当求解欧拉方程时,有必要处理在有限时间间隔内经历无限多次碰撞的刚体轨迹。

英文摘要:

We prove that one cannot construct, for arbitrary initial data, global-in-time physical classical solutions to Euler's equations of continuum rigid body mechanics when the constituent rigid bodies are not perfect spheres. By 'physical' solutions, we mean those that conserve the total linear momentum, angular momentum and kinetic energy of any given initial datum. The reason for absence of classical solutions is due to the non-existence of velocity scattering maps which resolve a collision between two non-spherical rigid bodies in such a way that (i) they do not interpenetrate, and (ii) total linear momentum, angular momentum and kinetic energy of the bodies are conserved through collision. In particular, this implies that when solving Euler's equations, it is necessary to deal with rigid body trajectories which experience infinitely-many collisions in a finite time interval.

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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