Journal of Computational Physics最新文献

Fast-convergence and asymptotic-preserving simulation of neutral particle flows in the plasma edge 等离子体边缘中性粒子流动的快速收敛和渐近保持模拟

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-10-03 DOI: 10.1016/j.jcp.2025.114428

Yifan Wen, Yanbing Zhang, Lei Wu

{"title":"Fast-convergence and asymptotic-preserving simulation of neutral particle flows in the plasma edge","authors":"Yifan Wen, Yanbing Zhang, Lei Wu","doi":"10.1016/j.jcp.2025.114428","DOIUrl":"10.1016/j.jcp.2025.114428","url":null,"abstract":"<div><div>The neutral flows in the plasma edge play a pivotal role in the design of nuclear fusion devices such as divertors and pumps. These flows are generally multiscale, encompassing the continuum, slip, transition, and free-molecular flow regimes, thus necessitating the use of gas kinetic equations. Traditional numerical methods, such as the direct simulation Monte Carlo method and the discrete velocity method, are hindered by extensive computation resources when dealing with near-continuum flows. This paper presents a general synthetic iterative scheme to deterministically simulate the neutral flows in plasma edge accurately and efficiently. By alternately solving the kinetic equations and macroscopic synthetic equations, our method substantially decreases the number of iterations, while maintains asymptotic-preserving properties even when the spatial cell size is much larger than the mean free path. Consequently, a significant reduction in the computational cost, particularly in near-continuum flow regimes, is achieved. This advancement provides an efficient computational tool essential for the advancement of next-generation nuclear fusion reactors.</div></div>","PeriodicalId":352,"journal":{"name":"Journal of Computational Physics","volume":"544 ","pages":"Article 114428"},"PeriodicalIF":3.8,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145242542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

On the unconditionally stable phase field model of ternary components system considering liquid-solid phase transition 考虑液固相变的三元体系无条件稳定相场模型

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-09-28 DOI: 10.1016/j.jcp.2025.114404

Yibao Li , Zhixian Lv, Qing Xia

{"title":"On the unconditionally stable phase field model of ternary components system considering liquid-solid phase transition","authors":"Yibao Li , Zhixian Lv, Qing Xia","doi":"10.1016/j.jcp.2025.114404","DOIUrl":"10.1016/j.jcp.2025.114404","url":null,"abstract":"<div><div>This study develops an unconditionally stable phase-field model for a ternary system considering liquid-solid phase transitions. The model modifies the Cahn-Hilliard equation to describe the interface between gas and the liquid-solid mixture, while the Allen-Cahn equation models the phase transition between the liquid and solid phases. Additionally, momentum and energy equations are introduced to simulate the quasi-incompressible three-phase flow dynamics. The resulting governing equations account for the coupling effects of phase transition, fluid flow, and heat transfer, effectively capturing the dynamic behavior of the mixture. The system satisfies mass conservation and adheres to the energy dissipation principle. A second-order numerical discretization scheme is developed and validated through a series of tests to confirm its mass conservation and unconditional energy stability. Numerical results demonstrate that the model accurately captures the evolution of the interface morphology, temperature field, and velocity field, showing excellent numerical stability and efficiency.</div></div>","PeriodicalId":352,"journal":{"name":"Journal of Computational Physics","volume":"543 ","pages":"Article 114404"},"PeriodicalIF":3.8,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Fixed-stress sequential schemes for a black-oil model in poroelastic media 孔隙弹性介质中黑油模型的定应力序列格式

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-09-27 DOI: 10.1016/j.jcp.2025.114406

Maicon R. Correa , Marcio A. Murad

{"title":"Fixed-stress sequential schemes for a black-oil model in poroelastic media","authors":"Maicon R. Correa , Marcio A. Murad","doi":"10.1016/j.jcp.2025.114406","DOIUrl":"10.1016/j.jcp.2025.114406","url":null,"abstract":"<div><div>We propose a new computational model for solving the Black-Oil flow model, incorporating geomechanical coupling within the framework of the fixed-stress-split scheme. The extended flow equations describing the movement of two slightly compressible liquids and a highly compressible gas are recast in terms of multiphase–multicomponent flow. Here, we construct a nonlinear extension of the fixed-stress split proposed in earlier work (Correa and Murad, J. Comput. Phys. v.373, pp. 493-532, 2018), which also allows for the compressibility of the liquid phases, dissolution of the gas in the oil phase, and gas phase appearance and disappearance. Flow and transport subsystems are rephrased in terms of compositions, and two alternative sequential coupling strategies at different levels are introduced to link the flow/transport and mechanics subsystems. These strategies incorporate a suitable definition of a trusted saturation variable within the flow equations, ensuring the full resolution of a three-equation system of conservation laws for the compositions and thereby enhancing the overall stability and accuracy of the proposed scheme. Flow and mechanics subsystems are discretized by mixed finite element formulations, whereas the transport system is solved by an innovative semi-discrete central-upwind finite volume scheme for hyperbolic conservation laws, capable of capturing spatial and temporal variability in the Lagrangian porosity and also obviating the need to adopt operator-splitting schemes for the storativity in the transport equations. The innovative numerical model clearly demonstrates its ability to capture the intricate interaction between geomechanical effects and phase change in the vicinity of the bubble point. Numerical experiments are performed, including an undrained setting upon cyclic loading and water-flooding problems, illustrating precisely the influence of the bubble point pressure upon the evolution of the poromechanical variables and hydrocarbon production.</div></div>","PeriodicalId":352,"journal":{"name":"Journal of Computational Physics","volume":"543 ","pages":"Article 114406"},"PeriodicalIF":3.8,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 structure-preserving collisional particle method for the Landau kinetic equation 朗道动力学方程的保结构碰撞粒子法

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-09-26 DOI: 10.1016/j.jcp.2025.114387

Kai Du , Lei Li , Yongle Xie , Yang Yu

引用次数: 0

A ghost-cell immersed boundary method for reacting flow simulations with conjugate heat transfer 共轭传热反应流动模拟的鬼胞浸入边界法

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-09-25 DOI: 10.1016/j.jcp.2025.114399

Wei Guan , Farshad Gharibi , Cheng Chi , Abouelmagd Abdelsamie , Dominique Thévenin

{"title":"A ghost-cell immersed boundary method for reacting flow simulations with conjugate heat transfer","authors":"Wei Guan , Farshad Gharibi , Cheng Chi , Abouelmagd Abdelsamie , Dominique Thévenin","doi":"10.1016/j.jcp.2025.114399","DOIUrl":"10.1016/j.jcp.2025.114399","url":null,"abstract":"<div><div>This paper proposes a novel methodology based on a ghost-cell immersed boundary method (IBM) for simulating conjugate heat transfer (CHT) between solids and reacting fluids. The method employs a directional ghost-cell IBM, where ghost values are reconstructed along each discretization direction, to impose Dirichlet boundary conditions. A conventional ghost-cell IBM, where ghost values are extrapolated along the wall-normal direction, is used to enforce Neumann boundary conditions. Combining both, a partially directional ghost-cell IBM is then developed to describe the coupled heat transfer between solids and fluids along complex fluid-solid interfaces on a Cartesian grid, using a Neumann-Dirichlet weak coupling strategy. A series of validation cases - including heat conduction and forced convection along flat and curved fluid-solid interfaces - demonstrate the ability of the method to accurately impose CHT boundary conditions at fluid-solid interfaces. Additionally, a nearly second-order accuracy in space is preserved. Finally, simulations of reacting flow in a packed-bed reactor, considering heat exchange between the flame and the solid, further illustrate the performance of the proposed method for realistic applications.</div></div>","PeriodicalId":352,"journal":{"name":"Journal of Computational Physics","volume":"543 ","pages":"Article 114399"},"PeriodicalIF":3.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Geometric optimization of a lithium-ion battery with the Doyle–Fuller–Newman model 基于Doyle-Fuller-Newman模型的锂离子电池几何优化

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-09-24 DOI: 10.1016/j.jcp.2025.114390

Richard Joly , Grégoire Allaire , Romain De Loubens

引用次数: 0

An efficient and robust high-order compact ALE gas-kinetic scheme 一种高效、鲁棒的高阶紧凑ALE气体动力学格式

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-09-24 DOI: 10.1016/j.jcp.2025.114398

Yibo Wang , Xing Ji , Liang Pan

{"title":"An efficient and robust high-order compact ALE gas-kinetic scheme","authors":"Yibo Wang , Xing Ji , Liang Pan","doi":"10.1016/j.jcp.2025.114398","DOIUrl":"10.1016/j.jcp.2025.114398","url":null,"abstract":"<div><div>For the arbitrary-Lagrangian–Eulerian (ALE) calculations, the geometric information needs to be calculated at each time step due to the movement of mesh. To achieve the high-order spatial accuracy, a large number of matrix inversions are needed, which affect the efficiency of computation dramatically. In this paper, an efficient and robust high-order compact ALE gas-kinetic scheme is developed for the compressible moving grids and moving boundary problems. The memory-reduction reconstruction Liu et al. (2024) is used to construct a quadratic polynomial on the target cell, where both structured and unstructured meshes can be used. Taking derivatives of the candidate polynomial, the quadratic terms can be obtained by the least square method using the average gradient values of the cell itself and its adjacent cells. Moving the quadratic terms to right-hand side of the constrains for cell averaged value, the linear terms of the polynomial can be determined by the least square method as well. As a result, the matrix for reconstruction coefficients is no longer required. The gradient compression factor is adopted to suppress the spurious oscillations near discontinuities. Combined with the two-stage fourth-order time discretization Li and Du (2016), a high-order compact gas-kinetic scheme is developed for ALE computation. In the process of mesh movement, the inversions of lower order matrix are needed for the least square method, which improves the efficiency greatly. Compared with the ALE scheme in Pan et al. (2020), a 7x speedup can be achieved in terms of the total execution time. In the computation, the grid velocity can be given by the mesh adaptation method and the cell centered Lagrangian nodal solver Maire et al. (2007). Numerical examples are presented to evaluate the accuracy, efficiency, robustness and the preservation of geometric conservation law of the current scheme.</div></div>","PeriodicalId":352,"journal":{"name":"Journal of Computational Physics","volume":"543 ","pages":"Article 114398"},"PeriodicalIF":3.8,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Enhanced diffuse interface method for multiphase flow simulations across all mach numbers 全马赫数多相流模拟的增强型扩散界面法

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-09-24 DOI: 10.1016/j.jcp.2025.114397

Ghanshyam Bharate, J.C. Mandal

引用次数: 0

A globally divergence-free entropy stable nodal DG method for conservative ideal MHD equations 保守理想MHD方程的全局无散度熵稳定节点DG方法

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-09-21 DOI: 10.1016/j.jcp.2025.114382

Yuchang Liu , Wei Guo , Yan Jiang , Mengping Zhang

引用次数: 0

A novel trunk branch-net PINN for flow and heat transfer prediction in porous medium 用于多孔介质流动和传热预测的新型干支网PINN

IF 3.8 2区物理与天体物理

Journal of Computational Physics Pub Date : 2025-09-20 DOI: 10.1016/j.jcp.2025.114385

Haoyun Xing , Kaiyan Jin , Guice Yao , Jin Zhao , Dichu Xu , Dongsheng Wen

{"title":"A novel trunk branch-net PINN for flow and heat transfer prediction in porous medium","authors":"Haoyun Xing , Kaiyan Jin , Guice Yao , Jin Zhao , Dichu Xu , Dongsheng Wen","doi":"10.1016/j.jcp.2025.114385","DOIUrl":"10.1016/j.jcp.2025.114385","url":null,"abstract":"<div><div>A novel Trunk-Branch (TB)-net physics-informed neural network (PINN) architecture is developed, which is a PINN-based method incorporating trunk and branch nets to capture both global and local features. The aim is to solve four main classes of problems: forward flow problem, forward heat transfer problem, inverse heat transfer problem, and transfer learning problem within the porous medium, which are notoriously complex that could not be handled by origin PINN. In the proposed TB-net PINN architecture, a Fully-connected Neural Network (FNN) is used as the trunk net, followed by separated FNNs as the branch nets with respect to outputs, and automatic differentiation is performed for partial derivatives of outputs with respect to inputs by considering various physical loss. The effectiveness and flexibility of the novel TB-net PINN architecture is demonstrated through a collection of forward problems, and transfer learning validates the feasibility of resource reuse. Combining with the superiority over traditional numerical methods in solving inverse problems, the proposed TB-net PINN shows its great potential for practical engineering applications.</div></div>","PeriodicalId":352,"journal":{"name":"Journal of Computational Physics","volume":"543 ","pages":"Article 114385"},"PeriodicalIF":3.8,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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