Prediction of instantaneous bottom shear stress for smooth turbulent bottom boundary layers under irregular waves
Prediction of instantaneous bottom shear stress for smooth turbulent bottom boundary layers under irregular waves
复制标题
不规则波下光滑湍流底部边界层瞬时底部剪应力预测
DOI：
10.1080/00221686.2006.9521664
复制
发表时间：
2006
影响因子：
2.3
通讯作者：
M. Samad
中科院分区：
文献类型：
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作者：
Hitoshi Tanaka;M. Samad
提出了一种由不规则波作用下自由流速变化计算水力光滑平面层瞬时湍流底剪应力的方法。引入了瞬时自由流速度和修正后的湍流波摩擦系数关系式，作为与底剪应力关系式的基础。通过k-e模型计算生成的自由流速度和相应的底部剪切应力的谱分析得到的湍流摩擦系数和相位差与实验室数据吻合较好。用该方法计算的瞬时底剪应力与不规则波浪试验数据进行了比较。所提出的方法具有较高的精度，并且可以很方便地定义光滑平面条件下底部剪应力变化的渐近特性
A method has been proposed to compute instantaneous turbulent bottom shear stress from the variation in free stream velocity under irregular waves for hydraulically smooth plane bed condition. Instantaneous free stream velocity and a modified relationship for turbulent wave friction factor have been introduced as the basis for the correlation with bottom shear stress. Turbulent friction factor and phase difference, obtained through spectral analysis of generated free stream velocity and corresponding bottom shear stress from k–e model computation, corresponds quite well to those from laboratory data. Instantaneous bottom shear stress computed by the proposed method has been compared with those from experimental data for irregular waves. The proposed method presents a high degree of accuracy and has been found to be very convenient in defining the asymptotic behavior of bottom shear stress variation under smooth plane bed condition