Engineering Analysis with Boundary Elements最新文献_第5页

Wave power absorption and wave loads characteristics of an annular oscillating water column (OWC) wave energy converter (WEC) with an attached reflector 附带反射器的环形振荡水柱（OWC）波能转换器（WEC）的波功率吸收和波载荷特性

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-17 DOI: 10.1016/j.enganabound.2024.105961

{"title":"Wave power absorption and wave loads characteristics of an annular oscillating water column (OWC) wave energy converter (WEC) with an attached reflector","authors":"","doi":"10.1016/j.enganabound.2024.105961","DOIUrl":"10.1016/j.enganabound.2024.105961","url":null,"abstract":"<div><p>Numerous wave energy converters (WECs) have been developed, with the oscillating water column (OWC) device garnering significant attention due to its uncomplicated design, minimal active mechanical components, robust durability, and high dependability. The synergy between offshore wind energy and wave energy presents an opportunity for their combined and coordinated utilization. This study focuses on the integration of an OWC WEC into a monopile foundation of an offshore wind turbine. The OWC features an annular cross-section with a reflector attached at the base of the air chamber. The aerodynamic and hydrodynamic coupling problem of the above integrated system is solved using the high-order boundary element method (HOBEM), with the quasi-singular integral issue arising from the thin-walled structure addressed through the adaptive Gaussian integral method. Through a systematic investigation utilizing the developed numerical model, the impact of the geometric parameters and cross-sectional shape of the reflector on wave energy capture and wave-induced loads is analyzed, considering vertical, inclined and arc-shaped reflector configurations. Findings indicate that the attached reflector not only enhances the wave energy capture in short waves but also broadens the effective frequency range for wave energy capture. Furthermore, the study reveals instances where the wave loads on the OWC device and monopile foundation can counterbalance each other at specific frequencies, resulting in the nullification of wave loads on the system. Adjusting the reflector size enables the manipulation of the frequencies at which wave loads reaches the minimum.</p></div>","PeriodicalId":51039,"journal":{"name":"Engineering Analysis with Boundary Elements","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142243790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

SS-DNN: A hybrid strang splitting deep neural network approach for solving the Allen–Cahn equation SS-DNN：解决艾伦-卡恩方程的混合斯特朗分裂深度神经网络方法

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-16 DOI: 10.1016/j.enganabound.2024.105944

{"title":"SS-DNN: A hybrid strang splitting deep neural network approach for solving the Allen–Cahn equation","authors":"","doi":"10.1016/j.enganabound.2024.105944","DOIUrl":"10.1016/j.enganabound.2024.105944","url":null,"abstract":"<div><p>The Allen–Cahn equation is a fundamental partial differential equation that describes phase separation and interface motion in materials science, physics, and various other scientific domains. The presence of interfacial width (<span><math><mi>ϵ</mi></math></span>) between two stable phases, associated with a nonlinear term, is a small positive parameter which makes the problem more challenging to solve as <span><math><mi>ϵ</mi></math></span> approaches zero. This paper proposes a novel hybrid deep splitting method to efficiently and accurately solve the Allen–Cahn equation in a convex polygonal domain in <span><math><mrow><msup><mrow><mi>R</mi></mrow><mrow><mi>d</mi></mrow></msup><mrow><mo>(</mo><mi>d</mi><mo>=</mo><mn>1</mn><mo>,</mo><mn>2</mn><mo>,</mo><mn>3</mn><mo>)</mo></mrow></mrow></math></span>. The method combines the benefits of deep learning and splitting strategies, leveraging the strengths of both approaches. Essentially, a second-order splitting method is employed to split the Allen–Cahn equation into two simpler linear and non-linear sub-problems. While the nonlinear sub-problem can be solved analytically, the deep neural network is utilized to approximate the linear sub-problem. By integrating deep learning into the splitting strategy, we achieve a more efficient and accurate solution for the Allen–Cahn equation, demonstrating promising results. We also derive an error estimate for the proposed hybrid method. Modified space adaptivity and transform learning techniques are employed to enhance the efficiency of the neural network.</p></div>","PeriodicalId":51039,"journal":{"name":"Engineering Analysis with Boundary Elements","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142243789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Comment on “Modeling groundwater flow with random hydraulic conductivity using radial basis function partition of unity method” by Shile et al. (2024) 就 Shile 等人的 "利用径向基函数统一分割法模拟具有随机水力传导性的地下水流 "发表评论 (2024)

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-16 DOI: 10.1016/j.enganabound.2024.105963

引用次数: 0

Phase-field formulated meshless simulation of axisymmetric Rayleigh-Taylor instability problem 轴对称雷利-泰勒不稳定性问题的相场计算无网格模拟

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-14 DOI: 10.1016/j.enganabound.2024.105953

{"title":"Phase-field formulated meshless simulation of axisymmetric Rayleigh-Taylor instability problem","authors":"","doi":"10.1016/j.enganabound.2024.105953","DOIUrl":"10.1016/j.enganabound.2024.105953","url":null,"abstract":"<div><p>A formulation of the immiscible Newtonian two-liquid system with different densities and influenced by gravity is based on the Phase-Field Method (PFM) approach. The solution of the related governing coupled Navier-Stokes (NS) and Cahn-Hillard (CH) equations is structured by the meshless Diffuse Approximate Method (DAM) and Pressure Implicit with Splitting of Operators (PISO). The variable density is involved in all the terms. The related moving boundary problem is handled through single-domain, irregular, fixed node arrangement in Cartesian and axisymmetric coordinates. The meshless DAM uses weighted least squares approximation on overlapping subdomains, polynomial shape functions of second-order and Gaussian weights. This solution procedure has improved stability compared to Chorin's pressure-velocity coupling, previously used in meshless solutions of related problems. The Rayleigh-Taylor instability problem simulations are performed for an Atwood number of 0.76. The DAM parameters (shape parameter of the Gaussian weight function and number of nodes in a local subdomain) are the same as in the authors’ previous studies on single-phase flows. The simulations did not need any upwinding in the range of the simulations. The results compare well with the mesh-based finite volume method studies performed with the open-source code Gerris, Open-source Field Operation and Manipulation (OpenFOAM®) code and previously existing results.</p></div>","PeriodicalId":51039,"journal":{"name":"Engineering Analysis with Boundary Elements","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0955799724004260/pdfft?md5=68129d0c3c305f8c10e9d31164c9724b&pid=1-s2.0-S0955799724004260-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142232144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A spherical source distribution method for calculating acoustic radiation of elastic underwater structures 用于计算弹性水下结构声辐射的球形声源分布方法

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-13 DOI: 10.1016/j.enganabound.2024.105945

{"title":"A spherical source distribution method for calculating acoustic radiation of elastic underwater structures","authors":"","doi":"10.1016/j.enganabound.2024.105945","DOIUrl":"10.1016/j.enganabound.2024.105945","url":null,"abstract":"<div><p>In this paper, a spherical source distribution method is established, and two kinds of spherical sound sources of symmetric and antisymmetric, distributed on a line inside the structure are proposed, in order to realize the vibro-acoustic calculation of three-dimensional elastic underwater structure. The spherical source distribution method has strong applicability and is suitable for the case where the shape of the structure is not axisymmetric. This method is a new method, and its fundamental formula is similar to the traditional acoustic boundary integral method, but it also has obvious differences. In numerical calculation, the traditional boundary element method is to divide the surface elements on the wet surface of the object, and transform the three-dimensional acoustic problem into the two-dimensional discrete element problem to solve. However, the spherical source distribution method, whose source points are only distributed on a straight line inside the object, transforms the three-dimensional acoustic problem into the quasi-one-dimensional discrete element problem, which makes the complexity and computation amount of the whole programming significantly reduced. In this paper, the fundamental principle of the spherical source distribution method, the calculation formula and the verification results of several numerical examples are discussed.</p></div>","PeriodicalId":51039,"journal":{"name":"Engineering Analysis with Boundary Elements","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142228707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

An extended lumped damage mechanics IGABEM formulation for quasi-brittle material failure 准脆性材料失效的扩展成块损伤力学 IGABEM 公式

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-12 DOI: 10.1016/j.enganabound.2024.105955

{"title":"An extended lumped damage mechanics IGABEM formulation for quasi-brittle material failure","authors":"","doi":"10.1016/j.enganabound.2024.105955","DOIUrl":"10.1016/j.enganabound.2024.105955","url":null,"abstract":"<div><p>This study proposes a new formulation for the mechanical modeling of quasi-brittle materials. The material degradation due to cracking is addressed through the Extended Lumped Damage Mechanics (XLDM) approach. The model is inserted into an IGABEM formulation, where Non-Uniform Rational B-Splines (NURBS) are the basis functions. A novel nonlinear solution technique has been developed for the numerical implementation. Crack propagation is captured using the initial stress field approach, widely utilized by the BEM community to account for nonlinear material behavior. The XLDM is coupled into an IGABEM formulation by discretizing part of the domain into cells, placed only where damage is expected to grow. Classical benchmark problems are presented to demonstrate the method’s capability and effectiveness. The results show excellent agreement with both experimental and numerical findings from the literature. Damage evolution is assessed through the band thickness opening, leading to material degradation. This method offers a new way of addressing damage mechanics problems within the BEM framework. It could benefit the BEM community, as traditional damage analysis within this numerical method often leads to significant time-consuming and elevated computational costs, which are mitigated by the formulation proposed herein.</p></div>","PeriodicalId":51039,"journal":{"name":"Engineering Analysis with Boundary Elements","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Explicit time-domain analysis of wave propagation in unbounded domains using the scaled boundary finite element method 使用缩放边界有限元法对波在无界域中的传播进行显式时域分析

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-03 DOI: 10.1016/j.enganabound.2024.105891

引用次数: 0

Assessment of RANS turbulence models based on the cell-based smoothed finite element model for prediction of turbulent flow 基于基于单元的平滑有限元模型的 RANS 湍流模型对湍流预测的评估

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-03 DOI: 10.1016/j.enganabound.2024.105937

{"title":"Assessment of RANS turbulence models based on the cell-based smoothed finite element model for prediction of turbulent flow","authors":"","doi":"10.1016/j.enganabound.2024.105937","DOIUrl":"10.1016/j.enganabound.2024.105937","url":null,"abstract":"<div><p>There is a growing body of literature that recognizes the importance of Smoothed Finite Element Method (S-FEM) in computational fluid dynamics (CFD) fields and, to a lesser extent, in complex turbulent flow problems. This study evaluates the performance of Reynolds-averaged Navier-Stokes (RANS) turbulence models within the S-FEM framework for predicting incompressible turbulent flows. Our assessment of three turbulence models based on the cell-based S-FEM (CS-FEM) is convincingly supported by testing on three flow problems. It is found that the CS-FEM exhibits superior mesh robustness compared to the Finite Volume Method (FVM) and achieves higher computational accuracy than the Finite Element Method (FEM). Notably, the CS-FEM combined with the standard k-epsilon model (CS-FEM-SKE) and the realizable k-epsilon model (CS-FEM-RKE) demonstrate robust performance in handling severely distorted meshes, with CS-FEM-RKE outperforming in regions of strong flow separation and convection. The Spalart-Allmaras model with CS-FEM (CS-FEM-SA) offers faster computational speed but shows poor mesh robustness. The hexcore mesh based on CS-FEM-RKE is employed to evaluate the aerodynamic performance of High-speed train (HST), resulting in enhanced computational efficiency. The outcomes show good agreement with other numerical studies and experimental data. Overall, it also highlights the latent capability of CS-FEM in solving complex engineering problems.</p></div>","PeriodicalId":51039,"journal":{"name":"Engineering Analysis with Boundary Elements","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142130244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Dynamic analysis of fractional poroviscoelastic reinforced subgrade under moving loading 移动荷载下的部分孔隙弹性加固路基动态分析

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-02 DOI: 10.1016/j.enganabound.2024.105935

引用次数: 0

Analysis of acoustic radiation problems involving arbitrary immersed media interfaces by the extended finite element method with Dirichlet to Neumann boundary condition 用扩展有限元法分析涉及任意浸入式介质界面的声辐射问题（附带迪里希勒到诺伊曼边界条件

IF 4.2 2区工程技术

Engineering Analysis with Boundary Elements Pub Date : 2024-09-02 DOI: 10.1016/j.enganabound.2024.105936

{"title":"Analysis of acoustic radiation problems involving arbitrary immersed media interfaces by the extended finite element method with Dirichlet to Neumann boundary condition","authors":"","doi":"10.1016/j.enganabound.2024.105936","DOIUrl":"10.1016/j.enganabound.2024.105936","url":null,"abstract":"<div><p>To quantify the influence of moving immersed media on acoustic radiation, this study develops an efficient method for acoustic radiation with arbitrary immersed media interfaces based on the extended finite element method (XFEM) and the Dirichlet-to-Neumann (DtN) boundary condition. The XFEM is employed for efficient and accurate modeling of the acoustic field with boundary shape variations. It requires no modification of the computational mesh and accurately captures non-smooth solutions on the interface by constructing enrichment functions. Additionally, the DtN boundary condition simulates the far-field radiation condition by establishing the relationship between the acoustic pressure and its derivatives. Numerical examples show that the proposed method efficiently characterizes changes in the position of immersed media interfaces without re-meshing the mesh. Variations in the thickness of porous material domains alter the acoustic radiation characteristics, with thicker porous material domains resulting in more pronounced noise reduction effects. Compared to changes in the thickness of porous material domains, changes in their position significantly alter the distribution of radiation pressure, indicating that ideal noise reduction effects can be achieved by strategically placing porous materials in specific locations in practical engineering applications.</p></div>","PeriodicalId":51039,"journal":{"name":"Engineering Analysis with Boundary Elements","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142130242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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