内孤立波作用下竖直圆柱体的横向力研究

本文对内孤立波作用下圆柱体的水动力特性进行了数值研究。对不同直径、不同水深比、不同浸没深度的圆柱进行了水平方向受力分析,从多个因素出发,研究了内孤立波对水下竖直圆柱的水平作用情况。通过分析水平作用力和力矩的时程曲线,得到内孤立波行进过程中对于圆柱体的横向作用力和力矩与时间的关系。通过对比不同工况下内孤立波橫向作用力幅值,得到内孤立波作用力幅值与圆柱直径、水深比以及浸没深度的关系。结果表明,内孤立波横向作用力(力矩)幅值与圆柱直径呈线性相关关系,但与水深比相关关系不明显,随着圆柱浸没深度的增加,内孤立波横向作用力幅值呈现出先增大后减小的趋势。

Study on Horizontal Forces of a Vertical Cylinder under Internal Solitary Waves

The hydrodynamic characteristics of a cylinder under an internal solitary wave were studied numerically. The horizontal forces and force torque on cylinders were investigated with different diame ters depth ratios of upper and lower layers and submerged depths of the cylinder. The horizontal forces and force torque of internal solitary waves acting on the underwater vertical cylinders was ana lyzed from different points of views. By analyzing the time series of the horizontal force and force torque, the relationship between the horizontal force (force torque) and time during the internal solitary wave propagating was obtained. By comparing the force amplitude of the internal solitary waves under different conditions, the relationship between the amplitude of the internal solitary wave horizontal forces and the cylinder diameter, the relationship between the amplitude of the internal solitary wave horizontal forces and the depth ratios of upper and lower layers, and the relationship between the ampli tude of the internal solitary wave horizontal forces and submerged depths of cylinder were obtained. The results show that the horizontal force (force torque) amplitude of the internal solitary waves is lin early correlated with the diameter of the cylinder, but the correlation between the horizontal force am plitude and the water depth ratio is not obvious. With the increase of the submerged depth of the cylin der, the horizontal force amplitude increases first and then decreases.