Journal of Computational and Theoretical Transport最新文献_第10页

Matrix Riccati Equation Solution of the 1D Radiative Transfer Equation 一维辐射传递方程的矩阵Riccati方程解

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-07-05 DOI: 10.1080/23324309.2020.1816553

B. Ganapol, J. Patel

引用次数: 2

A Mathematical Walk into the Paradox of Bloch Oscillations Bloch振荡悖论的数学探索

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-06-22 DOI: 10.1080/23324309.2020.1828470

L. Barletti

引用次数: 0

Canceling Teleportation Error in Legacy IMC Code for Photonics (Without Tilts, With Simple Minimal Modifications) 消除传统IMC代码中的隐形传态错误(没有倾斜，只需简单的最小修改)

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-06-06 DOI: 10.1080/23324309.2020.1785893

Gaël Poëtte, Xavier Valentin, Adrien Bernede

引用次数: 7

On the Random Walk Microorganisms Cells Distribution on a Planar Surface and Its Properties 微生物细胞在平面上的随机游动分布及其性质

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-06-06 DOI: 10.1080/23324309.2020.1785892

M. El-Hadidy

引用次数: 1

Linear Transport in Porous Media 多孔介质中的线性输运

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-05-25 DOI: 10.1080/23324309.2020.1842453

K. Amagai, Yuko Hatano, M. Machida

引用次数: 0

Modified Fokker-Planck Acceleration for Forward-Peaked Transport Problems in Slab Geometry 平板几何中前峰输运问题的修正Fokker-Planck加速度

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-05-13 DOI: 10.1080/23324309.2021.1894174

J. Kuczek, J. Patel, R. Vasques

引用次数: 0

Reviewing the Computational Performance of Structured and Unstructured Grid Deterministic SN Transport Sweeps on Many-Core Architectures 回顾结构化和非结构化网格确定性SN传输在多核心架构上的计算性能

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-04-15 DOI: 10.1080/23324309.2020.1775096

Tom Deakin, Simon McIntosh-Smith, J. Lovegrove, R. Smedley-Stevenson, A. Hagues

{"title":"Reviewing the Computational Performance of Structured and Unstructured Grid Deterministic SN Transport Sweeps on Many-Core Architectures","authors":"Tom Deakin, Simon McIntosh-Smith, J. Lovegrove, R. Smedley-Stevenson, A. Hagues","doi":"10.1080/23324309.2020.1775096","DOIUrl":"https://doi.org/10.1080/23324309.2020.1775096","url":null,"abstract":"Abstract In recent years the computer processors underpinning the large, distributed, workhorse computers used to solve the Boltzmann transport equation have become ever more parallel and diverse. Traditional CPU architectures have increased in core count, reduced in clock speed and gained a deep memory hierarchy. Multiple processor vendors offer a collectively diverse range of both CPUs and GPUs, with the architectures used in the fastest machines in the world ever growing in diversity of many-core architectures. Going forward, the landscape of processor technologies will require our codes to function well across multiple architectures. This ever increasing range of architectures represents a unique challenge for solving the Boltzmann equation using deterministic methods in particular, and so it is important to characterize the performance of those key algorithms across the processor spectrum. The solution of the transport equation is computationally expensive, and so we require well optimized and highly parallel solver implementations in order to solve interesting problems quickly. In this work we explore the performance profiles of deterministic SN transport sweeps for both 3D structured (Cartesian) and unstructured (hexahedral) meshes. The study focuses on the characteristics of computational performance which are responsible for the actual performance of a transport solver.","PeriodicalId":54305,"journal":{"name":"Journal of Computational and Theoretical Transport","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23324309.2020.1775096","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43955600","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: 2

Investigating the Simulation Rate of an Axially Symmetric Rarefied Gas Flow Using v-DSMC 用v-DSMC研究轴对称稀薄气流的模拟速率

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-04-15 DOI: 10.1080/23324309.2020.1770796

Siavash Maniee, Seyed Salman Noorazar

{"title":"Investigating the Simulation Rate of an Axially Symmetric Rarefied Gas Flow Using v-DSMC","authors":"Siavash Maniee, Seyed Salman Noorazar","doi":"10.1080/23324309.2020.1770796","DOIUrl":"https://doi.org/10.1080/23324309.2020.1770796","url":null,"abstract":"Abstract This article reports a comparative study of the convergence rate of an axially symmetric binary gas flow inside a rotating cylinder using an improved direct simulation Monte Carlo algorithm for rarefied gases (v-DSMC) and the conventional DSMC. Subsequently, a comparison between the convergence behavior of the v-DSMC and analytical data is carried out to scrutinize the validity of the v-DSMC algorithm. This method makes use of a modified collision model of variable hard sphere (VHS) termed Maxwell-VHS, which considers an equal contingency of collision but an arbitrary viscosity variation with temperature, for all adjacent gas particles. The results of the numerical simulation declare the convergence rate of the v-DSMC is noticeably faster than those performed by the conventional DSMC; however, a slight computational error occurs at the same simulation time due to higher accuracy of collision sampling in the conventional DSMC. Moreover, the results show a good agreement between the convergence behaviors of the v-DSMC in comparison with the analytical data.","PeriodicalId":54305,"journal":{"name":"Journal of Computational and Theoretical Transport","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23324309.2020.1770796","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49346754","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

Goal-Based Error Estimation for the Multi-Dimensional Diamond Difference and Box Discrete Ordinate (SN) Methods 多维菱形差分和盒形离散纵坐标(SN)方法的目标误差估计

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-01-30 DOI: 10.1080/23324309.2019.1710214

R. S. Jeffers, J. Kópházi, M. D. Eaton, F. Févotte, F. Hülsemann, J. Ragusa

{"title":"Goal-Based Error Estimation for the Multi-Dimensional Diamond Difference and Box Discrete Ordinate (SN) Methods","authors":"R. S. Jeffers, J. Kópházi, M. D. Eaton, F. Févotte, F. Hülsemann, J. Ragusa","doi":"10.1080/23324309.2019.1710214","DOIUrl":"https://doi.org/10.1080/23324309.2019.1710214","url":null,"abstract":"Abstract Goal-based error estimation due to spatial discretization and adaptive mesh refinement (AMR) has previously been investigated for the one dimensional, diamond difference, discrete ordinate (1-D DD-SN) method for discretizing the Neutron Transport Equation (NTE). This paper investigates the challenges of extending goal-based error estimation to multi-dimensions with supporting evidence provided on 2-D fixed (extraneous) source and Keff eigenvalue (criticality) verification test cases. It was found that extending Hennart’s weighted residual view of the lowest order 1-D DD equations to multi-dimensions gave what has previously been called the box method. This paper shows how the box method can be extended to higher orders. The paper also shows an equivalence between the higher order box methods and the higher order DD methods derived by Hébert et al. Though, less information is retained in the final solution in the latter case. These extensions allow for the definition of dual weighted residual (DWR) error estimators in multi-dimensions for the DD and box methods. However, they are not applied to drive AMR in the multi-dimensional case due to the various challenges explained in this paper.","PeriodicalId":54305,"journal":{"name":"Journal of Computational and Theoretical Transport","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23324309.2019.1710214","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47670354","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

Stochastic Resonance of Charge Carriers Diffusion in a Semiconductor Layer under a Nonuniform Low Temperature 非均匀低温下半导体层中载流子扩散的随机共振

IF 0.7 4区工程技术

Journal of Computational and Theoretical Transport Pub Date : 2020-01-23 DOI: 10.1080/23324309.2019.1709873

Berhanu Aragie

{"title":"Stochastic Resonance of Charge Carriers Diffusion in a Semiconductor Layer under a Nonuniform Low Temperature","authors":"Berhanu Aragie","doi":"10.1080/23324309.2019.1709873","DOIUrl":"https://doi.org/10.1080/23324309.2019.1709873","url":null,"abstract":"Abstract We study the dynamics of charge carriers jumping from one trap to the other of potential trap depth Φ in a one-dimensional semiconductor layer with the help of thermal noise. Applying a nonuniform temperature, colder around the center and hotter on moving away from it, favors the charge carriers to migrate toward the center and populate around the center. However, exposing the system to another additional nonuniform temperature, hotter around the center, forced the charge carriers to redistribute around two points. The trap potential together with the nonuniform temperature forms a system similar to having bistable potential. Diffusion of charge carriers and thermally transition rate, in a high barrier limit, as a function of controlling parameters has been explored. Due to a time-varying signal the system shows stochastic resonance (SR). The noise that made phase transition also favors the system to exhibit SR by applying a time varying signal. Using two-state approximation, SR of charge carriers diffusion, both analytical and numerical simulation, has been investigated. Our finding shows a strong spectral amplification η at a low temperature.","PeriodicalId":54305,"journal":{"name":"Journal of Computational and Theoretical Transport","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23324309.2019.1709873","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41848973","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: 2