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arXiv 1003.0080math-phmath.MP
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有环流势流中刚体的动力学

The Dynamics of a Rigid Body in Potential Flow with Circulation

Joris Vankerschaver, Eva Kanso, Jerrold E. Marsden

摘要:

本文研究了二维任意形状物体在平面无旋不可压缩流体中的运动,流体绕物体有一定的环流。我们推导出该系统的运动方程进行辛约化相对于组的体积保持的同构,并获得相关的泊松结构后,进一步的泊松约化相对于组的平移和旋转。通过这种方式,我们恢复了由Chaubergin和Lamb给出的该系统的运动方程,并且我们给出了作为曲率相关效应的库塔-朱可夫斯基力的几何解释。另外,我们证明了具有环流的刚体的运动可以理解为特殊欧氏群SE(2)的中心扩张上的测地线流,并且我们将这种中心扩张的描述中的上循环与一定的曲率张量联系起来。

英文摘要:

We consider the motion of a two-dimensional body of arbitrary shape in a planar irrotational, incompressible fluid with a given amount of circulation around the body. We derive the equations of motion for this system by performing symplectic reduction with respect to the group of volume-preserving diffeomorphisms and obtain the relevant Poisson structures after a further Poisson reduction with respect to the group of translations and rotations. In this way, we recover the equations of motion given for this system by Chaplygin and Lamb, and we give a geometric interpretation for the Kutta-Zhukowski force as a curvature-related effect. In addition, we show that the motion of a rigid body with circulation can be understood as a geodesic flow on a central extension of the special Euclidian group SE(2), and we relate the cocycle in the description of this central extension to a certain curvature tensor.

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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