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arXiv 1810.04501physics.flu-dyn
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奇粘性不可压缩流体的自由面变分原理

Free surface variational principle for an incompressible fluid with odd viscosity

Alexander G. Abanov, Gustavo M. Monteiro

摘要:

我们给出了具有自由表面和非零奇粘性的不可压缩流体动力学的变分和汉密尔顿公式。我们表明,在变分原理的奇粘性贡献对应于几何边界项。这些边界条件修改Zakharov的泊松括号,并导致一种新的类型的边界动力学。修改后的边界条件有一个自然的几何解释,描述了一个额外的压力在自由表面的表面本身的角速度成比例。这些边界条件被认为是普遍的,因为所提出的流体动力作用完全由系统的对称性决定。

英文摘要:

We present variational and Hamiltonian formulations of incompressible fluid dynamics with free surface and nonvanishing odd viscosity. We show that within the variational principle the odd viscosity contribution corresponds to geometric boundary terms. These boundary terms modify Zakharov's Poisson brackets and lead to a new type of boundary dynamics. The modified boundary conditions have a natural geometric interpretation describing an additional pressure at the free surface proportional to the angular velocity of the surface itself. These boundary conditions are believed to be universal since the proposed hydrodynamic action is fully determined by the symmetries of the system.

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