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arXiv 2102.13385physics.flu-dyn
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幂律流体沿斜面浅自由面流动中滚波的形成与演化

Formation and evolution of roll waves in a shallow free surface flow of a power-law fluid down an inclined plane

Alexander Chesnokov

摘要:

本文考虑在重力作用下沿斜面向下的薄层泥浆层流。在二维幂律流体控制方程及其深度平均双曲简化的框架下,研究了膜流的不稳定性和有限振幅波的形成。根据Whitham准则给出了这些模型存在横摇波的条件。数值计算了自由表面的演化和滚波的发展。结果表明,由二维方程得到的滚波振幅略大于一维模型。此外,对于某些流动参数,基本解的小扰动增长的二维方程和衰减的深度平均模型。一个双参数类的精确分段光滑解的一维模型,并与数值解进行了比较。在这些参数范围内,构造了滚波存在图。

英文摘要:

A laminar flow of a thin layer of mud down an inclined plane under the action of gravity is considered. The instability of a film flow and the formation of finite amplitude waves are studied in the framework of both two-dimensional governing equations of a power-law fluid and its depth-averaged hyperbolic simplification. Conditions of roll waves existence for these models are formulated in terms of Whitham criterion. Numerical calculations of the free surface evolution and the roll waves development are performed. It is shown that the roll waves amplitude obtained by the 2D equations is slightly larger than for the 1D model. Moreover, for certain flow parameters, small perturbations of the basic solution grow for the 2D equations and decay for the depth-averaged model. A two-parameter class of exact piecewise-smooth solutions of the 1D model is obtained and a comparison with a numerical solution is made. In the region of these parameters, diagrams of the roll waves existence are constructed.

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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