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Accuracy Improvement of plic-VOF Volume-Tracking Method Using the Equation of Surface Normal Vector

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Advances in Pure Mathematics 2013年第1期3卷 219-225页

作者： Mingyu Sun Institute of Fluid Science Tohoku University Sendai Japan

The plic/SN method that combines the second-order volume tracking method (plic-VOF) with the equation of surface normal (SN) vector was recently proposed (M. Sun, “Volume Tracking of Subgrid Particles,” International Journal for Numerical Methods in Fluids, Vol. 66, No. 12, 2011, pp. 1530-1554). The method is able to track the motion of a subgrid particle, but the accuracy is not as good as expected on high resolution grids for vortical flows. In this paper, a simple unsplit multidimensional advection algorithm is coupled with the equation of SN vector. The advection algorithm is formulated as the finite volume method, so that it can be used readily for both structured and unstructured grids while maintaining the exact mass conservation. The new method improves the accuracy significantly for high resolution grids. In the well-known test of the time-resolved vortex problem of T = 2, the circular interface is resolved with an accuracy better than ever using the equation of SN vector.

关键词： VOF plic plic/SN Surface Normal Interface Level Set Unstructured Grid

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基于FPGA的plic中断控制器设计

基于FPGA的PLIC中断控制器设计

Application of the VOF method based on unstructured quadrilateral mesh

2022’年中国西部声学学术交流会

作者：任宇浩乔东海苏州大学电子信息学院

近年来RISC-V作为一个开源的体系架构吸引了大量人才投入研究,因此需要设计出能够满足条件的中断系统,以支持处理器的需求。本文介绍了plic中断控制器的基本结构和控制原理,通过Verilog硬件描述语言设计了应用于RISC-V SoC系统的plic中... 详细信息

近年来RISC-V作为一个开源的体系架构吸引了大量人才投入研究,因此需要设计出能够满足条件的中断系统,以支持处理器的需求。本文介绍了plic中断控制器的基本结构和控制原理,通过Verilog硬件描述语言设计了应用于RISC-V SoC系统的plic中断控制器。并通过Modelsim软件对中断控制器的功能进行了仿真测试,基于FPGA构建硬件平台,对该中断控制器进行了原型验证,通过实验验证了功能的正确性。

关键词： plic FPGA 中断控制器

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Journal of Marine Science and Application 2008年第1期7卷 24-32页

作者：及春宁师颖 Tianjin Key Laboratory of Harbor & Ocean Engineering Tianjin University Huahui Architectural Design & Engineering Co. Ltd.

To simulate two-dimensional free-surface flows with complex boundaries directly and accurately, a novel VOF (Volume-of-fluid) method based on unstructured quadrilateral mesh is presented. Without introducing any complicated boundary treatment or artificial diffusion, this method treated curved boundaries directly by utilizing the inherent merit of unstructured mesh in fitting curves. The plic (Piecewise Linear Interface Calculation) method was adopted to obtain a second-order accurate linearized reconstruction approximation and the MLER (Modified Lagrangian-Eulerian Re-map) method was introduced to advect fluid volumes on unstructured mesh. Moreover, an analytical relation for the interface’s line constant vs. the volume clipped by the interface was developed so as to improve the method’s efficiency. To validate this method, a comprehensive series of large straining advection tests were performed. Numerical results provide convincing evidences for the method’s high volume conservative accuracy and second-order shape error convergence rate. Also, a dramatic improvement on computational accuracy over its unstructured triangular mesh counterpart is checked.

关键词： VOF unstructured quadrilateral mesh plic MLER

A comparative study of interface reconstruction algorithms in molten metal flow

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China Foundry 2013年第1期10卷 50-56页

作者： Young-Sim Choi Jun-Ho Hong Ho-Young Hwang e-Design Center Korea Institute of Industrial TechnologyIncheon 406-840Korea

In the present research,two numerical schemes for improving the accuracy of the solution in the flow simulation of molten metal were *** method is the Piecewise Linear Interface Calculation(plic) method and the other is the Donor-Acceptor(D-A) *** verify the module of the interface reconstruction algorithms,simple problems were *** these validations,the accuracy and efficiency of these two methods were compared by simulating various real *** the numerical simulation of free surface flow,it is possible for the plic method to track very accurately the interface between *** plic method,however,has the weak point in that a lot of computational time is required,though it shows the more accurate interface *** Donor-Acceptor method has enough effectiveness in the macro-observation of a mold filling sequence though it shows inferior ***,for the problems that need the accurate solution,plic is more appropriate than *** accuracy may cause less efficiency in numerical *** method between D-A method and plic method should be chosen depends on the product.

关键词： interface reconstruction DA plic molten metal flow accuracy volume of fluid method

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plicON:敢于与众不同

个人电脑 1995年第5期1卷 167-170页

作者： DOUGLAS BOLING 杨慧中

有时,你感觉自己就像是一个傻瓜,有时却又不是。这是形势所迫。现在的图形用户接口(GUI)都建立于一套通用设计标准之上,既然通用性占有一席之地,偶尔感到自己是傻瓜也就不足为怪了。想想看,为什么极小化的程序图标必须排列在Windows桌... 详细信息

有时,你感觉自己就像是一个傻瓜,有时却又不是。这是形势所迫。现在的图形用户接口(GUI)都建立于一套通用设计标准之上,既然通用性占有一席之地,偶尔感到自己是傻瓜也就不足为怪了。想想看,为什么极小化的程序图标必须排列在Windows桌面的下端呢?为什么不能放在屏幕的一侧或上面?有了plicON,上面的问题就迎刃而解了。 plicON是Place Icons(放置图标)的简写,它是一个控制面板的应用选项,告诉Windows应如何摆放图标。有了plicON这个帮手,你就可以随心所欲地让Windows把所有图标摆放在屏幕的上、下、左。

关键词：控制面板 Windows plic 应用程序帮助文件 DLL文件系统钩子最小化安装程序图形用户接口

低装载液箱晃荡砰击载荷的CLSVOF数值模拟(英文)

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船舶力学 2012年第9期16卷 990-998页

作者：刘永涛马宁朱仁庆顾解忡上海交通大学船舶海洋与建筑工程学院上海200240 江苏科技大学江苏镇江212003

应用CLSVOF数值方法模拟并计算液箱剧烈晃荡的砰击载荷。该方法由level-set方程获得网格内自由液面法向量,并由plicVOF方法重构自由液面,然后在重构后的自由液面上进行level-set方程的重新初始化。应用该方法,模拟了横摇以及横荡共振激... 详细信息

应用CLSVOF数值方法模拟并计算液箱剧烈晃荡的砰击载荷。该方法由level-set方程获得网格内自由液面法向量,并由plicVOF方法重构自由液面,然后在重构后的自由液面上进行level-set方程的重新初始化。应用该方法,模拟了横摇以及横荡共振激励作用下低装载液箱的晃荡砰击载荷,并与实验结果进行了对比,计算结果与实验结果较为一致。

关键词： level—set plic VOF CLSVOF 砰击载荷剧烈晃荡低装液水平

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基于非结构化四边形网格的VOF法

海洋技术 2008年第2期27卷 57-62,66页

作者：黄旭东及春宁王雪松天津城市建设学院土木工程系天津300384 天津大学建筑工程学院天津300072

提出了一种基于非结构化四边形网格的VOF法,用以模拟二维自由表面流动问题。由于非结构化四边形网格在拟合任意复杂曲线边界上的优势,此法能够在不进行任何边界处理和不引入任何人工糙度的情况下直接、准确地求解具有任意边界形状的界... 详细信息

提出了一种基于非结构化四边形网格的VOF法,用以模拟二维自由表面流动问题。由于非结构化四边形网格在拟合任意复杂曲线边界上的优势,此法能够在不进行任何边界处理和不引入任何人工糙度的情况下直接、准确地求解具有任意边界形状的界面对流问题。此法采用plic法来重构界面,以保证界面具有二阶空间精度;采用MLER法来对流流体体积,以提高算法的体积守恒性。此外,为了提高算法的计算效率,文中针对非结构化四边形网格提出了一种确定界面截距的解析方法。大应变界面对流数值实验表明:此法具有较高的体积守恒精度和二阶的形状误差收敛率。

关键词： VOF 非结构化四边形网格 plic MLER