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arXiv 1709.09692physics.flu-dyn
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浅水方程的边界条件问题(俄文)

The problem of boundary conditions for the shallow water equations (Russian)

T. A. Dyakonova, S. S. Khrapov, A. V. Khoperskov

摘要:

本文讨论了浅水波方程在不规则地形上进行数值积分时边界条件的选择问题。在模拟非稳定地表水流时,有一个动态边界将液体和干底分隔开。由于季节性洪泛区洪水、山洪暴发、海啸登陆等问题出现了亚临界流和超临界流,情况变得复杂。分析了边界沉降时液体物理量设置条件的各种方法的使用情况,表明在存在强非均匀性地貌的情况下使用瀑布型条件的优点。当计算域边界上存在瀑布时,边界附近地形可能出现不均匀性,形成临界流区,形成水跃,大大削弱了瀑布对上游流态的影响。

英文摘要:

The problem of choice of boundary conditions are discussed for the case of numerical integration of the shallow water equations on a substantially irregular relief. In modeling of unsteady surface water flows has a dynamic boundary partitioning liquid and dry bottom. The situation is complicated by the emergence of sub- and supercritical flow regimes for the problems of seasonal floodplain flooding, flash floods, tsunami landfalls. Analysis of the use of various methods of setting conditions for the physical quantities of liquid when the settlement of the boundary shows the advantages of using the waterfall type conditions in the presence of strong inhomogeneities landforms. When there is a waterfall on the border of the computational domain and heterogeneity of the relief in the vicinity of the boundary portion may occur, which is formed by the region of critical flow with the formation of a hydraulic jump, which greatly weakens the effect of the waterfall on the flow pattern upstream.

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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