孤立波作用下圆柱桩波浪力计算方法研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (14) : 11-19.

论文

孤立波作用下圆柱桩波浪力计算方法研究

鲁胜龙，朱金，蒋尚君，康锐，李永乐

作者信息 +

Calculation method of the wave force on a single cylinder pile induced by solitary waves

LU Shenglong，ZHU Jin，JIANG Shangjun，KANG Rui，LI Yongle

Author information +

文章历史 +

摘要

为研究孤立波作用下跨海桥梁桥墩受到的波浪荷载以得到孤立波波浪力的简化计算方法，利用计算流体力学软件OpenFOAM模拟海洋孤立波，在不同来流波高和初始水深下，开展了两组仿真实验，三维数值模拟用于直接计算圆柱体上的波浪力，二维数值模拟用于推导Morison方程所需的速度场。对比现有文献，讨论原始Morison方程应用于孤立波波浪力计算的适用性以及孤立波非线性的变化规律，并验证了引入非线性项的修正Morison方程预测孤立波荷载的适用性。研究结果表明：计算孤立波荷载时，非线性影响不可忽视，随着波高和水深的比值H/d的增大，孤立波的非线性越来越强；相比于原始Morison方程，考虑非线性影响的修正Morison方程可以更为准确地预测孤立波与圆柱桩间的相互作用；应用修正Morison方程进行孤立波荷载预测时，波浪力参数CD、CM的取值与波高H、水深d、圆柱桩直径D的绝对值无关，仅与H/d有关；基于多组仿真实验结果，给出了0.15≤H/d≤0.65范围内波浪力参数的取值，可为孤立波荷载的快速计算提供参考。

Abstract

In order to study the wave load on the bridge pier of a sea-crossing bridge under the action of solitary waves and obtain the simplified calculation method of solitary wave force, the computational fluid dynamics software OpenFOAM was used to simulate the solitary waves in the ocean. Two groups of simulation experiments were carried out under different incoming wave heights and initial water depths. The three-dimensional numerical simulation was performed to directly calculate the wave force on the cylinder, while the two-dimensional numerical simulation was conducted to obtain the velocity field to derive the Morison equation. By comparing with the results of the existing literatures, this paper discusses the applicability of the original Morison equation to the calculation of solitary wave force and the variation law of solitary wave nonlinearity, and verifies the applicability of the modified Morison equation with nonlinear term to predict solitary wave load. The results obtained are as follows. When calculating the solitary wave load, the nonlinear influence can not be ignored, and with the increase of the ratio of wave height to water depth H/d, the nonlinearity of solitary waves becomes stronger and stronger. Compared with the original Morison equation, the modified Morison equation considering nonlinear effects can predict the interaction between solitary waves and cylindrical piles more accurately. When applying the modified Morison equation to predict solitary wave load, the values of wave force parameters CD and CM are uniquely determined by H/d, and have nothing to do with the absolute values of wave height H, water depth d and cylindrical pile diameter D; Based on the results of several simulation experiments, the values of CD and CM in the range of 0.15≤H/d≤0.65 are given, which can provide reference for the rapid calculation of solitary wave load.

导出引用

鲁胜龙，朱金，蒋尚君，康锐，李永乐. 孤立波作用下圆柱桩波浪力计算方法研究[J]. 振动与冲击, 2023, 42(14): 11-19

LU Shenglong，ZHU Jin，JIANG Shangjun，KANG Rui，LI Yongle. Calculation method of the wave force on a single cylinder pile induced by solitary waves[J]. Journal of Vibration and Shock, 2023, 42(14): 11-19

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