海洋工程装备与技术

海洋工程装备与技术

• 海洋新能源开发与利用 • 上一篇    下一篇

二维重力式采样器触地姿态及采样率分析

孔丹雅1， 马哲1， 王胤2， 翟钢军1   

  1. (1. 大连理工大学海岸及近海工程国家重点实验室，辽宁大连116024；2. 大连理工大学岩土工程研究所，辽宁大连116024)
  • 出版日期:2018-10-30 发布日期:2018-10-30
  • 作者简介:孔丹雅(1994—)，女，硕士研究生，主要从事深海采样器与流场相互作用的研究。

 Analysis of Sampling Rate and Ground Contact Posture of Two-Dimension Gravity Sampling Device

KONG Dan-ya1, MA Zhe1, WANG Yin2, ZHAI Gang-jun1   

  1. (1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China; 2. Institute of Geotechnical Engineering, Dalian  University of Technology, Dalian, Liaoning 116024, China)
  • Online:2018-10-30 Published:2018-10-30

PDF (PC)

151

摘要： 为了提高深水重力式沉积物采样器的采样效率，本文基于OpenFOAM程序并通过动态重叠网格方法，模拟静水中采样器触底前较大范围自由下落时的姿态。通过计算球体自由下落并与文献结果对比，验证了方法的准确性和可行性。构建了采样器与流体相互作用二维时域耦合计算模型，分别对0°、 5°、 8°初始倾角的采样器自由下落姿态进行时域模拟，分析下落距离、下落速度以及采样器偏转角之间的相互关系。最终讨论了采样器的偏转角对取样效率的影响。研究结果表明： 采样器的初始偏转角对下落姿态以及取样效率均有较大影响，所得数据及结论可为实际海测提供指导。

Abstract: In order to improve the sampling rate of gravity sampler, this paper simulated the free falling posture among a wide range before its grounding based on OpenFOAM and dynamic overset grid method. The accuracy and feasibility of this method have been verified by calculating free falling of a sphere and comparing the results with literature. Established two-dimensional time-domain coupled calculation model of the sampler which interacts with flow field and simulated the free falling posture with initial slant angle of 0°, 5°, 8°, analysed the relationship among falling distance, falling speed and slant angle of the sampler. In the end the influence on sampling rate made by slant angle of the sampler has been discussed. The numerical results show that the initial slant angle has a great influence on falling posture and sampling rate. All of the data and conclusion can provide measurement with guidance.

中图分类号: