Communications in Computational Physics最新文献_第10页

Band Structure Calculations of Dispersive Photonic Crystals in 3D using Holomorphic Operator Functions 用全纯算子函数计算三维色散光子晶体的能带结构

IF 3.7 3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2022-0233

Wenqiang Xiao, Bo Gong, Junshan Lin null, Jiguang Sun

引用次数: 0

Learning Invariant Representation of Multiscale Hyperelastic Constitutive Law from Sparse Experimental Data 从稀疏实验数据学习多尺度超弹性本构律的不变表示

IF 3.7 3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2023-0098

Rui He, Junzhi Cui, Zihao Yang, Jieqiong Zhang null, Xiaofei Guan

{"title":"Learning Invariant Representation of Multiscale Hyperelastic Constitutive Law from Sparse Experimental Data","authors":"Rui He, Junzhi Cui, Zihao Yang, Jieqiong Zhang null, Xiaofei Guan","doi":"10.4208/cicp.oa-2023-0098","DOIUrl":"https://doi.org/10.4208/cicp.oa-2023-0098","url":null,"abstract":". Constitutive modeling of heterogeneous hyperelastic materials is still a challenge due to their complex and variable microstructures. We propose a multiscale data-driven approach with a hierarchical learning strategy for the discovery of a generic physics-constrained anisotropic constitutive model for the heterogeneous hyperelastic materials. Based on the sparse multiscale experimental data, the constitutive artificial neural networks for hyperelastic component phases containing composite interfaces are established by the particle swarm optimization algorithm. A microscopic finite element coupled constitutive artificial neural networks solver is introduced to obtain the homogenized stress-stretch relation of heterogeneous materials with different microstructures. And a dense stress-stretch relation dataset is generated by training a neural network through the FE results. Further, a generic invariant representation of strain energy function (SEF) is proposed with a parameter set being implicitly expressed by artificial neural networks (SANN), which describes the hyperelastic properties of heterogeneous materials with different microstructures. A convexity constraint is imposed on the SEF to ensure that the multiscale constitutive model is physically relevant","PeriodicalId":50661,"journal":{"name":"Communications in Computational Physics","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41985774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Hybrid WENO Scheme for Steady Euler Equations in Curved Geometries on Cartesian Grids 直角网格上弯曲几何稳定欧拉方程的混合WENO格式

IF 3.7 3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2022-0270

Yifei Wan null, Yinhua Xia

{"title":"A Hybrid WENO Scheme for Steady Euler Equations in Curved Geometries on Cartesian Grids","authors":"Yifei Wan null, Yinhua Xia","doi":"10.4208/cicp.oa-2022-0270","DOIUrl":"https://doi.org/10.4208/cicp.oa-2022-0270","url":null,"abstract":". For steady Euler equations in complex boundary domains, high-order shock-capturing schemes usually suffer not only from the difficulty of steady-state convergence but also from the problem of dealing with physical boundaries on Cartesian grids to achieve uniform high-order accuracy. In this paper, we utilize a fifth-order finite difference hybrid WENO scheme to simulate steady Euler equations, and the same fifth-order WENO extrapolation methods are developed to handle the curved boundary. The values of the ghost points outside the physical boundary can be obtained by applying WENO extrapolation near the boundary, involving normal derivatives acquired by the simplified inverse Lax-Wendroff procedure. Both equivalent expressions involving curvature and numerical differentiation are utilized to transform the tangential derivatives along the curved solid wall boundary. This hybrid WENO scheme is robust for steady-state convergence and maintains high-order accuracy in the smooth region even with the solid wall boundary condition. Besides, the essentially non-oscillation property is achieved. The numerical spectral analysis also shows that this hybrid WENO scheme has low dispersion and dissipation errors. Numerical examples are presented to validate the high-order accuracy and robust performance of the hybrid scheme for steady Euler equations in curved domains with Cartesian grids.","PeriodicalId":50661,"journal":{"name":"Communications in Computational Physics","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45229733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

General Synthetic Iterative Scheme for Unsteady Rarefied Gas Flows 非定常稀疏气体流的一般综合迭代格式

IF 3.7 3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2023-0068

Jianan Zeng, W. S. Null, L. Wu

引用次数: 0

Flux Globalization Based Well-Balanced Path-Conservative Central-Upwind Scheme for the Thermal Rotating Shallow Water Equations 基于通量全球化的热旋转浅水方程平衡路径保守中心迎风格式

3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2023-0132

Yangyang Cao, Alexander Kurganov null, Yongle Liu

引用次数: 0

A Normalizing Field Flow Induced Two-Stage Stochastic Homogenization Method for Random Composite Materials 随机复合材料的归一化场流诱导两阶段随机均匀化方法

3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2023-0007

Zihao Yang, Xintong Wang, Xiaofei Guan, Jizu Huang null, Xixin Wu

{"title":"A Normalizing Field Flow Induced Two-Stage Stochastic Homogenization Method for Random Composite Materials","authors":"Zihao Yang, Xintong Wang, Xiaofei Guan, Jizu Huang null, Xixin Wu","doi":"10.4208/cicp.oa-2023-0007","DOIUrl":"https://doi.org/10.4208/cicp.oa-2023-0007","url":null,"abstract":". The traditional stochastic homogenization method can obtain homogenized solutions of elliptic problems with stationary random coefficients. However, many random composite materials in scientific and engineering computing do not satisfy the stationary assumption. To overcome the difficulty, we propose a normalizing field flow induced two-stage stochastic homogenization method to efficiently solve the random elliptic problem with non-stationary coefficients. By applying the two-stage stochastic homogenization method, the original elliptic equation with random and fast oscillatory coefficients is approximated as an equivalent elliptic equation, where the equivalent coefficients are obtained by solving a set of cell problems. Without the stationary assumption, the number of cell problems is large and the corresponding computational cost is high. To improve the efficiency, we apply the normalizing field flow model to learn a reference Gaussian field for the random equivalent coefficients based on a small amount of data, which is obtained by solving the cell problems with the finite element method. Numerical results demonstrate that the newly proposed method is efficient and accurate in tackling high dimensional partial differential equations in composite materials with complex random microstructures","PeriodicalId":50661,"journal":{"name":"Communications in Computational Physics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135145211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Fourth-Order Kernel-Free Boundary Integral Method for Interface Problems 界面问题的四阶无核边界积分法

IF 3.7 3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2022-0236

Yaning Xie, Shuwang Li null, W. Ying

引用次数: 0

Implicit Quadrature-Free Direct Reconstruction Method for Efficient Scale-Resolving Simulations 有效尺度分辨模拟的隐式无正交直接重建方法

IF 3.7 3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2022-0253

Hojun You, Juhyun Kim null, Chongam Kim

引用次数: 0

A Well-Balanced Partial Relaxation Scheme for the Two-Dimensional Saint-Venant System 二维Saint-Venant系统的一个良好平衡的部分松弛方案

IF 3.7 3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2022-0319

Xinjiang Chen null, A. Kurganov

引用次数: 0

Numerical Solutions of the Electromagnetic Scattering by Overfilled Cavities with Inhomogeneous Anisotropic Media 非均匀各向异性介质过填充腔电磁散射的数值解

3区物理与天体物理

Communications in Computational Physics Pub Date : 2023-06-01 DOI: 10.4208/cicp.oa-2022-0104

Meiling Zhao, Jiahui He null, Liqun Wang

{"title":"Numerical Solutions of the Electromagnetic Scattering by Overfilled Cavities with Inhomogeneous Anisotropic Media","authors":"Meiling Zhao, Jiahui He null, Liqun Wang","doi":"10.4208/cicp.oa-2022-0104","DOIUrl":"https://doi.org/10.4208/cicp.oa-2022-0104","url":null,"abstract":". In this paper, the electromagnetic scattering from overﬁlled cavities with inhomogeneous anisotropic media is investigated. To solve the scattering problem, a Petrov-Galerkin ﬁnite element interface method on non-body-ﬁtted grids is presented. We reduce the inﬁnite domain of scattering to a bounded domain problem by introducing a transparent boundary condition. The level set function is used to capture complex boundary and interface geometry that is not aligned with the mesh. Non-body-ﬁtted grids allow us to save computational costs during mesh generation and signiﬁcantly reduce the amount of computer memory required. The solution is built by connecting two linear polynomials across the interfaces to satisfy the jump conditions. The proposed method can handle matrix coefﬁcients produced by permittivity and permeability tensors of anisotropic media. The ﬁnal linear system is sparse, making it more suitable for most iterative methods. Numerical experiments show that the proposed method has good convergence and realizability. Meanwhile, we discover that the absorbing properties of anisotropic media clearly and positively inﬂuence the reduction of radar cross section. It has also been demonstrated that the method can achieve second-order accuracy.","PeriodicalId":50661,"journal":{"name":"Communications in Computational Physics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135144002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0