内孤立波对水平圆柱潜体作用力的计算
发布时间：2018-08-22 09:19
【摘要】：针对内孤立波对潜体的载荷作用,分析受力特性并建立合适的载荷计算方法.基于文献资料,选取mKdV(modified KdV)理论,建立两层流体中考虑浮力变化的内孤立波对顺流向放置潜体的垂向力及力矩的计算方法,使用Matlab编制计算程序.利用已有文献试验结果对本文计算结果的可靠性进行验证,分析潜体所受垂向力及力矩在内波流场中不同位置处的时历变化.结果表明,下凹型内孤立波在上层流体中对潜体的垂向力及力矩大于在下层流体中对潜体的垂向力及力矩.垂向力在波谷前、后位置方向相反,具有垂向上、下剪切特性,在穿越过程中会对潜体产生强大的垂向力矩,尤其是在内界面与波面之间的流体层中,密度变化导致潜体产生浮力差.潜体所受的总垂向作用力及力矩远大于内孤立波本身对潜体的垂向作用力及力矩,分层流体中浮力的变化对潜体的影响至关重要.
[Abstract]:In view of the load effect of internal solitary wave on submersible body, the stress characteristics are analyzed and a suitable load calculation method is established. Based on the literature and mKdV (modified KdV) theory, the method of calculating vertical force and moment of internal solitary wave in two-layer fluid with consideration of buoyancy variation is established. The calculation program is compiled by Matlab. The reliability of the calculated results is verified by the experimental results in the literature, and the time-history changes at different positions in the internal wave flow field of the vertical force and moment of the submersible are analyzed. The results show that the vertical force and torque of the concave internal solitary wave to the submersible body in the upper fluid is larger than that of the submersible body in the lower fluid. In front of the trough, the vertical force is in the opposite direction at the back, and it has the characteristics of vertical and downward shear, which will produce a strong vertical torque on the submersible during the passage, especially in the fluid layer between the inner interface and the wave surface. The change of density results in poor buoyancy of the submersible. The total vertical force and torque of submersible body is much larger than that of internal solitary wave itself. The effect of buoyancy in stratified fluid on submersible body is very important.
【作者单位】： 中国海洋大学工程学院;海洋石油工程股份有限公司;
【基金】：国家自然科学基金资助项目(51279187)
【分类号】：P75;P731.2
本文编号：2196665
[Abstract]:In view of the load effect of internal solitary wave on submersible body, the stress characteristics are analyzed and a suitable load calculation method is established. Based on the literature and mKdV (modified KdV) theory, the method of calculating vertical force and moment of internal solitary wave in two-layer fluid with consideration of buoyancy variation is established. The calculation program is compiled by Matlab. The reliability of the calculated results is verified by the experimental results in the literature, and the time-history changes at different positions in the internal wave flow field of the vertical force and moment of the submersible are analyzed. The results show that the vertical force and torque of the concave internal solitary wave to the submersible body in the upper fluid is larger than that of the submersible body in the lower fluid. In front of the trough, the vertical force is in the opposite direction at the back, and it has the characteristics of vertical and downward shear, which will produce a strong vertical torque on the submersible during the passage, especially in the fluid layer between the inner interface and the wave surface. The change of density results in poor buoyancy of the submersible. The total vertical force and torque of submersible body is much larger than that of internal solitary wave itself. The effect of buoyancy in stratified fluid on submersible body is very important.
【作者单位】： 中国海洋大学工程学院;海洋石油工程股份有限公司;
【基金】：国家自然科学基金资助项目(51279187)
【分类号】：P75;P731.2
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