Simulation analysis of free falling posture of gravity sampling device using OpenFOAM

被引：0
|
作者：
Ma Z. [1 ]
Kong D. [1 ]
Wang Y. [2 ]
Zhai G. [1 ]
机构：
[1] State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian
[2] Institute of Geotechnical Engineering, Dalian University of Technology, Dalian
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Fluid-structure interaction; Free falling posture; Gravity sediment sampler; OpenFOAM program; Overset grid;
D O I：
10.11817/j.issn.1672-7207.2019.02.010
中图分类号：
学科分类号：
摘要：
In order to improve sampling efficiency of gravity sampler in deep water under complicated environment conditions such as sea current and cable, the free falling posture of sampler among a wide range before its grounding was simulated based on OpenFOAM program and dynamic overset grid method. Three-dimensional time-domain coupled calculation model of the sampler which interacts with flow field was established. The Newmark method was used to solve the motion equations of the structure iteratively in the flow field. After verification of the grid convergence, the free falling postures of sampler with initial slant angle of 0° and 5° were simulated and the relationships among falling distance, falling speed and slant angle of the sampler were analyzed. In the end, the influence of the slant angle on the sampling rate was studied. The results show that the proposed three-dimensional time-domain coupled calculation model can predict the free falling posture accurately. The initial slant angle has great influence on falling posture and sampling rate of sampler. © 2019, Central South University Press. All right reserved.
引用
收藏
页码：321 / 327
页数：6
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