基于动力拟序涡模型的水波三维大涡模拟
首发时间:2011-01-05
摘要:利用大涡模拟理论数值模拟了水波的传播过程,其中亚格子应力模型采用动力拟序涡粘性亚格子应力模型。模拟波型包括规则波和不规则波。计算结果表明,模型对水波的波高及由波产生的流体速度分布模拟结果与解析值吻合良好,且有较高的精度。另外,对比了采用人工海绵层及Sommerfeld辐射性耦合边界条件与仅采用Sommerfeld辐射性边界条件对水波数值模拟精度的影响。分析计算结果表明采用动力拟序涡粘性模型的大涡模拟方法可以准确地模拟水波传播特性,研究成果为后续波、流耦合以及波和建筑物相互作用等问题的研究奠定了基础。
关键词: 水力学及河流动力学 大涡模拟 动力拟序涡模型 Stokes波 JONSWAP波
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Three-dimensional large eddy simulation of water wave using the dynamic coherent structures eddy model
Abstract:In this paper, waves are simulated by using large eddy simulation technique, in which a dynamic coherent eddy model proposed by Lu and Wang is used to modeled subgrid turbulent stress. The model is used to simulate the propagation of Stokes first order wave and JONSWAP wave. Numerical results are compared with available analytical solutions in terms of velocities profiles, free surface displacement. Good agreements are obtained. The model and method are verified with high accuracy and efficiency in simulating surface wave propagation. Comparison of using the Sommerfeld radiation condition in conjunction with the artificial damping zone and the Sommerfeld radiation condition at outflow boundary is also made. The present work provides a foundation of further study of interaction between wave-structure and wave-discharge.
Keywords: Hydraulics and River Dynamics Large eddy simulation Dynamic coherent eddy model Stokes wave JONSWAP wave
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