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arXiv 1809.01780physics.flu-dyn
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小表面张力潜源引起的三维毛细波

Three-dimensional capillary waves due to a submerged source with small surface tension

Christopher J. Lustri, Ravindra Pethiyagoda, S. Jonathan Chapman

摘要:

本文研究了在无重力作用的情况下,在小表面张力极限下,通过淹没源的定常和非定常线性流。产生的自由表面毛细波是指数小的表面张力,并使用指数渐近理论确定。在定常问题中,毛细管波从源向上游延伸,在自由表面上的曲线上切换,称为斯托克斯线。自由表面位置的渐近预测并与计算解进行比较。在非定常问题中,瞬态效应导致解显示出更复杂的渐近行为,例如高阶斯托克斯线。应用指数渐近理论,揭示了毛细波随时间的演化过程,并最终趋于稳态解。

英文摘要:

Steady and unsteady linearised flow past a submerged source are studied in the small-surface-tension limit, in the absence of gravitational effects. The free-surface capillary waves generated are exponentially small in the surface tension, and are determined using the theory of exponential asymptotics. In the steady problem, capillary waves are found to extend upstream from the source, switching on across curves on the free surface known as Stokes lines. Asymptotic predictions and compared with computational solutions for the position of the free surface. In the unsteady problem, transient effects cause the solution to display more complicated asymptotic behaviour, such as higher-order Stokes lines. The theory of exponential asymptotics is applied to show how the capillary waves evolve over time, and eventually tend to the steady solution.

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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