Containment booms are commonly used in collecting and containing spilled oil on the sea surface and in protecting specific sea areas against oil slick spreading.In the present study,a numerical model is proposed based...Containment booms are commonly used in collecting and containing spilled oil on the sea surface and in protecting specific sea areas against oil slick spreading.In the present study,a numerical model is proposed based on the N-S equations in a mesh frame.The proposed model tracks the outline of the floating boom in motion by using the fractional area/volume obstacle representation technique.The boom motion is then simulated by the technique of general moving object.The simulated results of the rigid oil boom motions are validated against the experimental results.Then,the failure mechanism of the boom is investigated through numerical experiments.Based on the numerical results,the effects of boom parameters and dynamic factors on the oil containment performance are also assessed.展开更多
According to the observation in experiment of stability of the oil film, the assumption of velocity distribution for both the water flow and the oil film is introduced. On the basis of the assumption, Orr-Sommerfeld s...According to the observation in experiment of stability of the oil film, the assumption of velocity distribution for both the water flow and the oil film is introduced. On the basis of the assumption, Orr-Sommerfeld stability equation is applied to develop the method of determining the critical velocity of the oil film, and the criterion for stability of the oil film is obtained. Meanwhile, a formula describing the relation between the thickness of the oil film and the velocity of the water flow is also given and examined by the laboratory experiment.展开更多
The dynamics of contained oil spills is investigated based on multiphase CFD (Computational Fluid Mechanics) model. The oil slick shape behind the oil boom under water current is studied. The velocity field in the oil...The dynamics of contained oil spills is investigated based on multiphase CFD (Computational Fluid Mechanics) model. The oil slick shape behind the oil boom under water current is studied. The velocity field in the oil slick is compared with the velocity field in pure water flow. The thickness of the oil slick is studied quantitatively. It is found that there is a fixed linear relationship between the oil slick relative thickness and the Froude number for different oil, different current velocity, different boom draft and different volume of oil.展开更多
为完善海上搜救模拟器中的溢油仿真模块,在对近海潮流进行数值模拟的基础上,通过对溢油扩展、漂移、蒸发和乳化数学模型的组合计算,首先实现了近海溢油运动过程的实时仿真。随后结合海浪的真实感绘制算法,使用OSG(Open Scene Graph)纹...为完善海上搜救模拟器中的溢油仿真模块,在对近海潮流进行数值模拟的基础上,通过对溢油扩展、漂移、蒸发和乳化数学模型的组合计算,首先实现了近海溢油运动过程的实时仿真。随后结合海浪的真实感绘制算法,使用OSG(Open Scene Graph)纹理烘焙和平面折射技术,实现了海上溢油扩散过程的三维可视化。对现有海上溢油应急处理技术进行研究,针对溢油机械回收设备中常用的围油栏建模,为实现海上溢油被围油栏拦截过程的动态仿真,提出了一种围油栏与溢油间的碰撞检测算法,最后实现了围油栏拦截溢油的实时动态仿真与三维可视化,其仿真结果对解决实际溢油污染问题具有实用价值。展开更多
基金supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(No.51321065)the Program of International S&T Cooperation(No.S2015ZR1030)
文摘Containment booms are commonly used in collecting and containing spilled oil on the sea surface and in protecting specific sea areas against oil slick spreading.In the present study,a numerical model is proposed based on the N-S equations in a mesh frame.The proposed model tracks the outline of the floating boom in motion by using the fractional area/volume obstacle representation technique.The boom motion is then simulated by the technique of general moving object.The simulated results of the rigid oil boom motions are validated against the experimental results.Then,the failure mechanism of the boom is investigated through numerical experiments.Based on the numerical results,the effects of boom parameters and dynamic factors on the oil containment performance are also assessed.
文摘According to the observation in experiment of stability of the oil film, the assumption of velocity distribution for both the water flow and the oil film is introduced. On the basis of the assumption, Orr-Sommerfeld stability equation is applied to develop the method of determining the critical velocity of the oil film, and the criterion for stability of the oil film is obtained. Meanwhile, a formula describing the relation between the thickness of the oil film and the velocity of the water flow is also given and examined by the laboratory experiment.
文摘The dynamics of contained oil spills is investigated based on multiphase CFD (Computational Fluid Mechanics) model. The oil slick shape behind the oil boom under water current is studied. The velocity field in the oil slick is compared with the velocity field in pure water flow. The thickness of the oil slick is studied quantitatively. It is found that there is a fixed linear relationship between the oil slick relative thickness and the Froude number for different oil, different current velocity, different boom draft and different volume of oil.
文摘为完善海上搜救模拟器中的溢油仿真模块,在对近海潮流进行数值模拟的基础上,通过对溢油扩展、漂移、蒸发和乳化数学模型的组合计算,首先实现了近海溢油运动过程的实时仿真。随后结合海浪的真实感绘制算法,使用OSG(Open Scene Graph)纹理烘焙和平面折射技术,实现了海上溢油扩散过程的三维可视化。对现有海上溢油应急处理技术进行研究,针对溢油机械回收设备中常用的围油栏建模,为实现海上溢油被围油栏拦截过程的动态仿真,提出了一种围油栏与溢油间的碰撞检测算法,最后实现了围油栏拦截溢油的实时动态仿真与三维可视化,其仿真结果对解决实际溢油污染问题具有实用价值。
