粘性流体势流理论及波浪与毗连多浮体相互作用研究

项目名称： 粘性流体势流理论及波浪与毗连多浮体相互作用研究

项目编号： No.51279029

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 水利工程

项目作者： 吕林

作者单位： 大连理工大学

项目金额： 82万元

中文摘要： 海上油气产品的装/卸载需要毗连多浮体的联合作业，其中涉及到多种共振现象。而经典势流模型往往会对共振响应给出过高估计，其根本原因是传统的"理想流体势流理论"忽略了流体的粘性属性，无法考虑在共振中起重要作用的机械能损耗。新兴的"粘性流体势流理论"则抛开了这一假设，这为在统一的势流理论内考虑机械能损耗提供了可能途径。但是现有的"粘性流体势流理论"主要用于开阔水域的波浪传播和波能损耗问题。本项目将"粘性流体势流理论"引入到波浪与结构物相互作用问题中，同时结合NS方程数值求解和室内模型试验，重点研究波浪与毗连多浮体相互作用中的共振响应（包括浮体间窄缝内的流体振荡、浮体内部的液体晃荡、浮体自身的运动响应）以及这些运动形式之间的干涉和叠加效应。本项目研究工作的开展将建立新型的"粘性流体势流模型"，加深人们对波浪与多浮体相互作用规律，特别是机械能损耗机理的认识，为海上极端作业工况的安全保障提供技术支持。

中文关键词： 粘性流体；势流理论；波浪与结构相互作用；机械能损耗；共振响应

英文摘要： Multiple floating bodies in proximity are often encountered in the uploading/offloading operations of oil and gas products, for example, from the FPSO to the oil shuttle tanker. Several resonant responses can be excited by the incident waves. It is well known that the potential flow model can lead to the over-prediction of resonant responses. This is mainly attributed to the assumption of inviscid fluid in the conventional potential flow theory. That means the mechanical energy dissipation, which plays a fairly important role in the resonance, can not be considered. As a contrast, the newly developed potential flow theory of viscous fluids is free from the restriction of inviscid fluids. It allows the mechanical energy dissipation to be taken into account. However, the present potential theory of viscous fluid is mainly developed for the wave propagation problem for ocean hydrodynamics. This project aims to extend the viscous potential flow theory to the context involving floating structures. The interaction of water wave with multiple floating bodies in close proximity will be investigated by using the novel potential flow theory of viscous fluids, together with the numerical simulations based on the Navier-Stokes equations and laboratory tests. The main concerned issues of this project include 1) the fluid res

英文关键词： Viscous Fluids；Potential Flow Theory；Wave and Structure Interaction；Mechanical Energy Dissipation；Resonant Response