表面波诱导的近底高浓度泥沙水层内波动场的计算

随着水质恶化,底泥悬浮对水质的重要影响受到极大地关注.计算机的迅速发展为数值模拟底泥运动与再悬浮研究提供了可靠手段.利用连续性方程和N-S方程模拟流体质点运动,采用VOF法追踪自由面和水-泥沙水的相界面运动,建立了空气-水-高浓度泥沙水的数值波浪水槽,实现了波浪作用下的流场动力学响应模拟.利用波谱分析手段,分析了流场中表面波和内波耦合波场的波动特性,提出了小幅值线性波动场的计算方法.

Wave Field Analysis of Near-Bottom Water Layer of High Sediment Concentration Induced by Surface Wave

With the increase of water environment pollution,the effect of sediment movement on seawater quality attracts more and more attentions.With the development of computers,numerical simulation of sediment movement is becoming possible.The viscous multiphase flow theory was applied to simulate the velocity of flow field.The sur-face of air-water and the interface water-sand and water were tracked by VOF method.The numerical wave tank of air-water-water with high sediment concentration was established and the dynamic response of near-bottom water with high sediment concentration to surface wave was simulated.By applying spectral analysis method,the wave charac-teristics of the surface wave and the coupled internal wave and surface wave field was analyzed.The analytical solu-tion of coupled wave field was presented for small amplitude fluctuations.