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基于网格的数值方法(如有限元、有限体积、有限差分等)在大变形、不连续等问题中遇到挑战, 因此人们提出了多种无网格方法. 最优输运无网格方法是一种新型拉格朗日无网格方法, 但是继承了有限元方法在边界表征、边界处理等方面的优势, 在表面张力模拟中具有较大潜力. 基于拉格朗日方程, 通过将表面张力势能加入拉格朗日函数, 得到的表面张力广义力精确地作用在流体表面, 而且表面张力系数是唯一的输入参数. 给出了最优输运无网格方法轴对称离散格式. 通过对二维/三维泊肃叶流、静止和振动的液滴、液滴变形等典型问题的仿真分析, 验证了最优输运无网格方法在表面张力问题模拟中的精度和收敛性.Owing to challenges encountered by mesh-based CFD methods when simulating large material deformation, a number of meshfree methods have been presented. The optimized transportation meshfree method is a newly developed meshfree method, but it inherits the advantage of the finite element method in boundary treatment and thus having great potential applications in surface tension effect simulation. By adding the surface tension potential into the Lagrangian, the resulting generalized force acts on fluid surfaces exactly. The axial symmetry treatment is also discussed. By simulating several benchmark cases such as two- and three-dimensional Poiseuille flow, static and vibrating drop and drop deformation, the advantages like precision and convergence of the optimized transportation meshfree method in simulating surface tension effect are verified.
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Keywords:
- optimized transportation meshfree method /
- surface tension /
- Lagrangian equations /
- axial symmetry
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[1] Wang H, Zhang Z Y, Yang Y M, Zhang H S 2010 Chin. Phys. B 19 026801
Google Scholar
[2] Annaland M, Deen N G, Kuipers J A M 2005 Chem. Eng. Sci. 60 2999
Google Scholar
[3] Croce R, Griebel M, Schweitzer M A 2010 Int. J. Numer. Meth. Fl. 62 963
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Google Scholar
[6] Alexandre M T, Kim F F, Paul M 2009 Comput. Phys. Commun. 18 01874
Google Scholar
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Google Scholar
[8] Alexandre T, Paul M 2005 Phys. Rev. E 72 026301
[9] 马理强, 常建忠, 刘汉涛, 刘谋斌 2012 物理学报 61 054701
Google Scholar
Ma L Q, Chang J Z, Liu H T, Liu M B 2012 Acta Phys. Sin. 61 054701
Google Scholar
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Google Scholar
Bai L, Li D M, Li Y Q, Wang Z C, Li Y Y 2015 Acta Phys. Sin. 64 114701
Google Scholar
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Google Scholar
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Google Scholar
Jiang T, Lu L G, Lu W G 2013 Acta Phys. Sin. 62 224701
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[21] 张天龙, 马天宝, 郝莉 2021 兵器装备工程学报 42 144
Google Scholar
Zhang T L, Ma T B, Hao L 2021 J. Ordnance Equip. Eng. 42 144
Google Scholar
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Google Scholar
[23] Fedeli L, Pandolfi A, Ortiz M 2017 Int. J. Numer. Meth. Eng. 112 1905
Google Scholar
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Google Scholar
[25] Leonardo D G S, Jaime K, Eloy S, Yasmin M, Anwar H 2003 J. Comput. Phys. 191 622
Google Scholar
[26] Hu X Y, Adams N A 2006 J. Comput. Phys. 213 844
Google Scholar
[27] Tadashi W 2008 WSEAS Transactions on Fluid Mechanics 3 164
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