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arXiv 1604.04778math-phmath.MP
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共形变量中的自由表面流体动力学:深水自由表面流体动力学方程可积吗?

Free-Surface Hydrodynamics in Conformal Variables: Are Equations of Free-Surface Hydrodynamics on Deep Water Integrable?

Vladimir Zakharov

摘要:

Dyachenko和Zakharov在1994年提出了描述二维空间中具有自由表面的不可压缩理想流体的势运动方程在有重力和无重力情况下的完全可积性假设[1]。后来,同一作者发现这些方程具有无限数量的附加运动常数[2],这是支持可积性假设的论据。在这篇文章中,我们制定了另一个论点,赞成这一猜想。已知[3],自由表面方程具有保持表面平坦但描述整个流体质量的压缩的奇异解。在这篇文章中,我们表明,自由表面流体动力学是可积的,如果运动可以被视为一个有限振幅扰动的压缩流体解决方案。可积性使得构造具有自由表面的欧拉方程的不定数目的精确解成为可能。

英文摘要:

The hypothesis on complete integrability of equations describing the potential motion of incompressible ideal fluid with free surface in 2-D space in presence and absence of gravity was formulated by Dyachenko and Zakharov in 1994 [1]. Later on, the same authors found that these equations have indefinite number of additional motion constants [2] that was an argument in support of the integrability hypothesis. In this article we formulate another argument in favor of this conjecture. It is known [3] that the free-surface equations have an exotic solution that keeps the surface flat but describes the compression of the whole mass of fluid. In this article we show that the free-surface hydrodynamic is integrable if the motion can be treated as a finite amplitude perturbation of the compressed fluid solution. Integrability makes possible to construct an indefinite number of exact solutions of the Euler equations with free surface.

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