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FastFEM: Behaviour of fast ships in waves

FastFEM：快速船舶在波浪中的行为

基本信息

批准号：
EP/L025388/1
负责人：
Onno Bokhove
金额：
$ 18.75万
依托单位：
University of Leeds
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2014
资助国家：
英国
起止时间：
2014 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FL025388%2F1
关键词：
FastFEM Behaviour fast ships waves

项目摘要

The use of fast (10 to 60m) ships has become popular in maritime operations. They nowadays emerge in search and rescue operations, surveillance, Coast Guard activities, interceptor and security missions, anti drugs and piracy actions, in fast supply to offshore platforms, and for crew transport and wind farm maintenance. The main advantage is their speed, while the challenge is to maintain safe seakeeping at high speeds in mild to heavy seaway, while also keeping these ships affordable, reliable, fuel efficient and comfortable. We propose to develop new simulation tools for the dynamics of fast ships and surrounding waves in breaking seas, and to validate these simulations with advanced and novel towing tank laboratory experiments.Classical calculations of waves are based on (non)linear potential flow wave theory. Such simulations are quite good provided accurate numerical methods are used, but can never deal with wave breaking due to the potential flow Ansatz. In addition, potential flow wave codes in three dimensions need to become computationally more efficient. This requires further scientific development (work package WP1 at the University of Twente, The Netherlands by Jaap van der Vegt with Onno Bokhove), especially when wave and ship dynamics are fully and nonlinearly coupled, as proposed. Another key issue in WP1 is preservation of the variational formulation of wave dynamics, to ensure numerical stability, within our partially existing discontinuous Galerkin finite element methodology (DGFEM). Our first innovation is to simulate wave breaking around the ships, as well as incoming breaking waves, with a new, advanced single-phase mixture theory for the water-air mixture (in WP2 at the University of Leeds). In contrast to other numerical methods that can deal with wave breaking (such as Volume of Fluid methods and Smoothed Particle Hydrodynamics), our method does not lead to (unwanted) numerical wave damping in areas with smooth waves. Our second innovation is that the new method is by design constructed to include our (variational) potential flow limit with nonlinear ship dynamics. Hence, this new methodology for fast ships in breaking seas does require that the DGFEM for the combined ship and potential flow wave dynamics is fully developed as well (in WP1). Essential is the anticipated validation of both (integrated) simulation tools against advanced and new towing tank experiments. Beyond the numerical validation, these towing tank experiments (in WP3 at Delft University of Technology, The Netherlands by Rene Huijsmans) provide direct and new data to the users in the form of the measured (nonlinear and breaking) wave environment around fast ships, pressures on their hulls as well as onboard accelerations. These laboratory measurements will be directly used by our users: Damen Shipyards, MARIN, Royal Netherlands Navy, Royal Netherlands Rescue Organisation (KNRM), Bureau Veritas, and Lloyds Register, while the proposed simulation tools supporting new hull designs will form a sustained investment.

在海上作业中，使用快速(10至60米)船舶已变得很流行。如今，它们出现在搜救行动、监视、海岸警卫队活动、拦截和安全任务、反毒品和海盗行动、向海上平台快速供应以及船员运输和风力发电场维护中。主要的优势是它们的速度，而挑战是在温和到重度的海浪中保持高速的安全耐波性，同时还保持这些船只负担得起、可靠、燃油效率和舒适性。我们建议开发新的仿真工具，用于快速船舶和周围波浪在破浪中的动力学，并用先进的、新颖的拖曳水池实验室实验来验证这些仿真。如果使用精确的数值方法，这样的模拟是相当好的，但永远不能处理由于势流Anatz而导致的波浪破碎。此外，三维势流波代码需要在计算上变得更有效。这需要进一步的科学开发(荷兰特温特大学的Jaap van der Vegt与Onno Bokhove共同编写的WP1工作包)，特别是在波浪和船舶动力学完全和非线性耦合的情况下，如建议的那样。WP1中的另一个关键问题是保留波动动力学的变分形式，以确保在我们部分现有的不连续Galerkin有限元方法(DGFE)中的数值稳定性。我们的第一个创新是用一种新的、先进的水-空气混合物的单相混合物理论(在利兹大学的WP2中)模拟船舶周围的波浪破碎以及即将到来的破碎波浪。与其他可以处理波浪破碎的数值方法(如流体体积法和平滑粒子流体力学)相比，我们的方法不会在光滑海浪区域产生(不需要的)数值海浪衰减。我们的第二个创新是，新方法的设计是为了将我们的(变分)势流极限与非线性船舶动力学结合起来。因此，对于破浪中的快速船舶，这种新的方法确实要求充分发展船舶和势流波浪联合动力学的DGFE(WP1)。关键是预期验证两种(集成的)模拟工具，以对抗先进的和新的拖曳水箱实验。除了数值验证，这些拖曳水池实验(由荷兰代尔夫特科技大学WP3由Rene Huijsman进行)以快速船周围测量的(非线性和破碎的)波浪环境、船体压力以及船上加速度的形式向用户提供直接和新的数据。这些实验室测量将由我们的用户直接使用：Damen造船厂、Marin、荷兰皇家海军、荷兰皇家救援组织(KNRM)、Bureau Veritas和Lloyds Register，而建议的支持新船体设计的模拟工具将形成持续投资。