基于流、固两相流模型的海洋平台基础冲刷数值模拟研究  

Numerical simulation of scour around an offshore platform foundation based on a two-phase flow model

作　　者：陈岱新 艾丛芳 闫庆勋[1] 陈磊[1] CHEN Daixin;AI Congfang;YAN Qingxun;CHEN Lei(Geophysical Device of China Oilfield Services Limited,Tianjin 300459,China;Dalian University of Technology,Faculty of Infrastructure Engineering,Dalian 116024,China)

机构地区：[1]中海油田服务股份有限公司物探事业部,天津300459 [2]大连理工大学建设工程学部,辽宁大连116024

出　　处：《海洋环境科学》2023年第6期965-972,共8页Marine Environmental Science

基　　金：国家自然科学基金项目(52171248);中央高校基本科研业务项目(DUT21LK01)。

摘　　要：海洋平台的冲刷本质为流、固两相流的相互作用问题,采用两相流模型模拟这一相互作用过程可以准确反映其物理机制。本文基于两相流模型SedFOAM,建立海洋平台基础的三维两相流冲刷数值模型,对桩基局部冲刷坑演变过程和桩柱上、下游的最大冲刷深度进行了研究,分析了桩基局部冲刷的主要影响因素。结果表明,在单向水流作用下,桩柱上游出现半圆形的冲刷坑,最大无量纲冲刷深度(约为0.65)出现在桩柱上游;冲刷过程中桩柱下游出现斜向发展的淤积带;受下潜水流的影响,桩前最大冲刷深度可达平衡深度的80%。本文的研究成果可为实际海洋平台的冲刷预测和基础保护提供科学依据。Scour around an offshore platform foundation is essentially a two-phase flow problem and can be predicted accurately by a two-phase flow model from the point of view of physical mechanics.In this paper,based on a two-phase flow model SedFOAM,a three-dimensional simulation of scour around an offshore platform foundation is conducted.The evolution process of the local scouring pit and the maximum scouring depth at the upstream and downstream of the pile foundation are investigated.The main influencing factors for the local scouring are analyzed.The results show that a semi-circular scouring pit appears at the upstream of the pile and the maximum dimensionless scouring depth is up to about 0.65 and is located at the upstream of the pile.During the scouring process,there is a deposition zone developing obliquely along the downstream of the pile.The scouring at the upstream of the pile is mainly affected by the submerged flow.The maximum scouring depth in front of the pile can reach 80%of the equilibrium scouring depth before the middle stage of the whole scouring process.The research findings can provide scientific basis for scouring prediction and foundation protection of actual offshore platforms.

关 键 词：海洋平台 数值模拟 泥沙输运 桩基冲刷 SedFOAM 

分 类 号：P731.2[天文地球—海洋科学]