摘要:随着社会日新月异的发展,自然能源和资源越来越紧张,海洋中富含着十分丰富的各种资源,所以备受全球各国的关注,因而二十一世纪被称为是海洋的世纪。在研究浩瀚的海洋的道路上,人们不断前进。船舶是人类驶向海洋的一个重要的交通工具。然而,近年来,全球海难事故不断地发生,特别是在航海条件恶劣的情况下,船舶的船体在风浪中长期航行而致使破损,船体的碰撞、触礁、搁浅等等恶性事故的发生都会导致船体底部的破舱进水,甚至最终船沉人亡。因次,研究船体破舱进水的过程,为救援队员的救援赢得时间和方法显得尤为重要。如何迅速的判断船体破舱进水后的安全性,进而采取有效的方式进行救助,是各级指挥员们一直关注的焦点。
本文PLIC-VOF数值模拟方法,采用一个简单的船舱模型,对于不同位置、不同大小的船体破口,对船底破舱进水过程进行数值模拟研究。本课题使用ANSYS中的Fluent软件来进行船底破舱进水的速率和船体内部的压力,特别是船体进水的时间的计算,应用Fluent软件对船舶破舱进水过程可以尽可能精确的数值模型模拟。采用研究成果如下所示:
(1)调研收集分析有关资料,总结分析各种船舱破损进水过程的研究方法的现状,针对研究现状,本文将采用PLIC-VOF数值模拟进行深入研究。
(2)本文分析研究了不同船底的破口位置和大小,以及船体吃水位置,研究随着时间变化的舱内氧气的体积分数的变化以及进水速率。
(3)本文总结分析了船舱底部破损进水过程的影响因素和特性,通过这些数据可以让人们更加了解到船底发生破损后舱内的情况特点。
关键词:船底破舱;数值模拟;破损进水模型;fluent仿真;流动特性;VOF
Abstract:With the rapid development of society, natural energy and resources are increasingly nervous. The ocean is rich in a wealth of resources, so much attention from all over the world, so the twenty-first century is known as the ocean century. In the study of the vast ocean on the road, people continue to move forward. The ship is an important transport for mankind to the sea. However, in recent years, the global maritime accident has occurred, especially, in the case of bad navigation conditions, the ship's hull in the long-term sailing in the storm caused by damage, hull collision, hit the rocks, stranded, and so the occurrence of a vicious incident will lead to the water flooding into the bottom of the damaged vessel’s compartments and even the final ship sinking and man death. It is particularly important to study the process of water flooding into the damaged vessel’s compartments and to win the time and method for the rescue of the rescue team. How to quickly determine the safety of the water flooding into the damaged vessel’s compartments and then to take an effective way to rescue are the commanders at all levels to have been the focus of attention.
In this paper, I will use the PLIC-VOF method to numerical simulation of the water flooding into a bottom damaged vessel’s compartments and use a simple cabin model for different locations and different sizes of hull damage. In this paper, the Fluent software in ANSYS is used to calculate the velocity of the water flooding into the ship and the pressure inside the hull, especially, the calculation of the time of the water flooding into the hull. The application of Fluent software to the process of the water flooding into the bottom of the damaged vessel’s compartments can be as accurate as possible numerical model simulation. The results of the research are as follows: