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Convergence and Complexity of an Adaptive Planewave Method for Eigenvalue Computations 用于特征值计算的自适应平面波方法的收敛性和复杂性
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2024-02-01 DOI: 10.4208/aamm.oa-2023-0099
Xiaoying Dai,Yan Pan,Bin Yang, Aihui Zhou
In this paper, we study the adaptive planewave discretization for a clusterof eigenvalues of second-order elliptic partial differential equations. We first designan a posteriori error estimator and prove both the upper and lower bounds. Based onthe a posteriori error estimator, we propose an adaptive planewave method. We thenprove that the adaptive planewave approximations have the linear convergence rateand quasi-optimal complexity
本文研究了二阶椭圆偏微分方程特征值群的自适应平面波离散化。我们首先设计了一个后验误差估计器,并证明了上界和下界。在后验误差估计器的基础上,我们提出了一种自适应平面波方法。然后,我们证明了自适应平面波近似具有线性收敛速率和准最优复杂度。
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引用次数: 0
Development of a Novel Nonlinear Dynamic Cavitation Model and Its Numerical Validations 新型非线性动态气蚀模型的开发及其数值验证
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2024-02-01 DOI: 10.4208/aamm.oa-2023-0041
Haidong Yu,Xiaobo Quan,Haipeng Wei,Matevž Dular, Song Fu
Aiming at modeling the cavitation bubble cluster, we propose a novel nonlinear dynamic cavitation model (NDCM) considering the second derivative term inRayleigh-Plesset equation through strict mathematical derivation. There are two improvements of the new model: i) the empirical coefficients are eliminated by introduction of the nonuniform potential functions of $psi_v$ and $psi_c$ for growth and collapse processes respectively, and ii) only two model parameters are required, which both baseon physical quantities–the Blake critical radius $R_b$ and the average maximum growthradius $R_m.$ The corresponding cavitation solver was developed by using OpenFOAMin which we implemented the modified momentum interpolation (MMI) method toensure that the calculated results are independent of time step size. Three validationcases, namely numerical bubble cluster collapse, ultrasonic horn experiment, and hydrodynamic cavitation around slender body are employed. The results indicate that $psi_v$ and $psi_c$ can reveal the nonlinear characteristics for cavity accurately, and $R_b$ and $R_m$ can reflect the relevance between cavitation model and actual physical quantities.Moreover, it is discussed the potentiality of NDCM that is generally applied on thecavitating flow possessing with dispersed bubbly cloud.
针对空化气泡团的建模问题,我们通过严格的数学推导,提出了一种考虑雷利-普莱塞特方程二阶导数项的新型非线性动态空化模型(NDCM)。新模型有两点改进:i)通过引入分别用于生长和塌陷过程的 $psi_v$ 和 $psi_c$ 的非均匀势函数,消除了经验系数;ii)只需要两个模型参数,这两个参数都基于物理量--布莱克临界半径 $R_b$ 和平均最大生长半径 $R_m。我们使用 OpenFOAM 开发了相应的空化求解器,并在其中采用了修正动量插值(MMI)方法,以确保计算结果与时间步长无关。我们采用了三个验证案例,即数值气泡簇坍塌、超声波喇叭实验和细长体周围的流体动力空化。结果表明,$psi_v$和$psi_c$能准确揭示空化的非线性特征,$R_b$和$R_m$能反映空化模型与实际物理量的相关性。
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引用次数: 0
Cell-Average Based Neural Network Method for Hunter-Saxton Equations 基于细胞平均值的亨特-萨克斯顿方程神经网络法
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2024-01-01 DOI: 10.4208/aamm.oa-2022-0278
Chunjie Zhang, Changxin Qiu, Xiaofang Zhou and Xiaoming He
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引用次数: 0
A Primal-Dual Discontinuous Galerkin Finite Element Method for Ill-Posed Elliptic Cauchy Problems 针对失当椭圆考奇问题的原始-双非连续伽勒金有限元方法
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2024-01-01 DOI: 10.4208/aamm.oa-2022-0108
Yanli Chen, Tie Zhang and Ying Sheng
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引用次数: 0
A Buckley-Leverett Theory Based Lattice Boltzmann Method for Immiscible Two-Phase Flow with Viscous Coupling in Porous Media 基于巴克利-勒维特理论的多孔介质中粘性耦合不相溶两相流晶格玻尔兹曼方法
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2024-01-01 DOI: 10.4208/aamm.oa-2022-0275
Yang Wang, Liang Shi, Yong Liu
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引用次数: 0
Prediction of Transition Locations in Regions of the Minor Axis of Hypersonic Elliptic Cones using the BiGlobal-$e^N$ Method 使用 BiGlobal-$e^N$ 方法预测超音速椭圆锥小轴线区域的过渡位置
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2024-01-01 DOI: 10.4208/aamm.oa-2022-0183
Lei Zhao, Wenqiang Zhou, Xinliang Li, Shaolong Zhang and Yongming Zhang
{"title":"Prediction of Transition Locations in Regions of the Minor Axis of Hypersonic Elliptic Cones using the BiGlobal-$e^N$ Method","authors":"Lei Zhao, Wenqiang Zhou, Xinliang Li, Shaolong Zhang and Yongming Zhang","doi":"10.4208/aamm.oa-2022-0183","DOIUrl":"https://doi.org/10.4208/aamm.oa-2022-0183","url":null,"abstract":"","PeriodicalId":54384,"journal":{"name":"Advances in Applied Mathematics and Mechanics","volume":"34 19","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139394963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Novel Construction of Distribution Function through Second-Order Polynomial Approximation in Terms of Particle Mass, Momentum and Energy 根据粒子质量、动量和能量,通过二阶多项式逼近法构建分布函数的新方法
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2024-01-01 DOI: 10.4208/aamm.oa-2023-0107
Z. Yuan, Z. Chen, C. Shu, Y. Liu and Z. Zhang
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引用次数: 0
An Isoparametric Finite Element Method for Reissner-Mindlin Plate Problem on Curved Domain 曲面上 Reissner-Mindlin 板问题的等参数有限元方法
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2024-01-01 DOI: 10.4208/aamm.oa-2022-0206
Zhixin Liu null, Minghui Song and Shicang Song
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引用次数: 0
Compressive Strength Prediction of High-Performance Hydraulic Concrete using a Novel Neural Network Based on the Memristor 利用基于 Memristor 的新型神经网络预测高性能水工混凝土的抗压强度
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2024-01-01 DOI: 10.4208/aamm.oa-2022-0127
Jun Lu, Lin Qiu, Yingjie Liang and Ji Lin
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引用次数: 0
Numerical Analysis of Stabilized Second Order Semi-Implicit Finite Element Methods for the Phase-Field Equations 相场方程的稳定二阶半隐式有限元方法的数值分析
IF 1.4 4区 工程技术 Q2 MATHEMATICS, APPLIED Pub Date : 2023-12-01 DOI: 10.4208/aamm.oa-2023-0046
Congying Li, Liang Tang and Jie Zhou
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引用次数: 0
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