Numerical Model for Wave-Induced Scour below a Submarine Pipeline
Numerical Model for Wave-Induced Scour below a Submarine Pipeline
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DOI：
10.1061/(asce)0733-950x(2005)131:5(193
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发表时间：
2005-09
期刊：
影响因子：
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通讯作者：
D. Liang;Liang Cheng
中科院分区：
文献类型：
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作者：
D. Liang;Liang Cheng
建立了一个波浪作用下海底管道局部冲刷的垂向二维数值模型。波被模拟为正弦振荡流，并且通过求解具有k-ω湍流闭合的T-S平均Navier-Stokes方程来模拟管道周围的相分辨速度场。模型中同时考虑了悬移质和推移质输沙。一种特殊的技术耦合的流场的解决方案，冲刷计算的开发，以适应不同的时间尺度的流量和形态的变化。海底形态计算是基于周期平均输沙率与形态时间步长，这是通过指定在每次更新的最大允许床变形选择。数值试验表明，这种方法大大降低了计算成本，并具有可接受的精度。每次河床更新后，采用滑砂法来消除河床的小不规则性。
A vertical two-dimensional numerical model for local scour beneath an offshore pipeline exposed to waves is developed in this study. Waves are modeled as sinusoidally oscillatory flows, and the phase-resolved velocity field around the pipeline is simulated by solving the Reynolds-averaged Navier-Stokes equations with a k-ω turbulence closure. Both suspended and bed loads of sediment transport are considered in the model. A special technique for coupling the solution of the flow field to the scour calculation is developed to accommodate different timescales of the flow and morphological changes. The seabed morphology calculation is based on the period-averaged sediment transport rate with a morphological time step that is chosen by designating a maximum allowable bed deformation in each update. Numerical tests indicate that this technique significantly reduces the computational costs and is of acceptable accuracy. A sand-slide method is employed after each bed update to smooth out small bed irregularities....