Computers & Fluids最新文献_第7页

Mimetic differences and pseudo symplectic Runge Kutta methods for incompressible Navier Stokes equations 不可压缩Navier Stokes方程的模拟差分和伪辛Runge Kutta方法

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-11-11 DOI: 10.1016/j.compfluid.2025.106898

Anand Srinivasan , Perry Johnson , José Castillo

引用次数: 0

Investigation of filter stability and consistency for high-resolution turbulent flow simulations on finite-domains 有限域高分辨率湍流模拟滤波器的稳定性和一致性研究

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-11-22 DOI: 10.1016/j.compfluid.2025.106919

James G․ Coder

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Data-driven RANS closures using a relative importance term analysis based classifier for 2D and 3D separated flows 数据驱动的RANS闭包使用基于相对重要项分析的分类器，用于2D和3D分离流

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-11-13 DOI: 10.1016/j.compfluid.2025.106899

Tyler Buchanan , Monica Lăcătuş , Alastair West , Richard P. Dwight

{"title":"Data-driven RANS closures using a relative importance term analysis based classifier for 2D and 3D separated flows","authors":"Tyler Buchanan , Monica Lăcătuş , Alastair West , Richard P. Dwight","doi":"10.1016/j.compfluid.2025.106899","DOIUrl":"10.1016/j.compfluid.2025.106899","url":null,"abstract":"<div><div>This study presents a novel approach for enhancing Reynolds-averaged Navier-Stokes (RANS) turbulence modeling through the application of a Relative Importance Term Analysis (RITA) methodology to develop a new zonally-augmented <span><math><mrow><mi>k</mi><mo>−</mo><mi>ω</mi></mrow></math></span> SST model. Traditional Linear Eddy Viscosity Models often struggle with separated flows. Our approach introduces a physics-based binary classifier that systematically identifies separated shear layers requiring correction by analyzing the relative magnitudes of terms in the turbulent kinetic energy equation. Using symbolic regression, we develop compact correction terms for Reynolds stress anisotropy and turbulent kinetic energy production. Trained on 2D configurations, our model demonstrates significant improvements in predicting separation dynamics while maintaining baseline performance in fully attached flows. Generalization tests on Ahmed body and Faith hill 3D configurations confirm robust transferability, establishing an effective methodology for targeted enhancement of RANS predictions in separated flows.</div></div>","PeriodicalId":287,"journal":{"name":"Computers & Fluids","volume":"305 ","pages":"Article 106899"},"PeriodicalIF":3.0,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145615894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Adaptive criterion and modification of wave-particle decomposition in UGKWP method for high-speed flow simulation 高速流动模拟UGKWP法波粒分解自适应准则及修正

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-11-06 DOI: 10.1016/j.compfluid.2025.106896

Junzhe Cao , Yufeng Wei , Wenpei Long , Chengwen Zhong , Kun Xu

{"title":"Adaptive criterion and modification of wave-particle decomposition in UGKWP method for high-speed flow simulation","authors":"Junzhe Cao , Yufeng Wei , Wenpei Long , Chengwen Zhong , Kun Xu","doi":"10.1016/j.compfluid.2025.106896","DOIUrl":"10.1016/j.compfluid.2025.106896","url":null,"abstract":"<div><div>Benefiting from its direct modeling of physical laws in discretized space and its automatic decomposition of hydrodynamic waves and particles, the unified gas-kinetic wave-particle (UGKWP) method provides significant advantages for a wide range of multiscale physical problems, including hypersonic flow, plasma transport, and radiation transport. To achieve a more effective and efficient wave-particle decomposition in high-speed flow simulations, particularly in regions with drastic scale variations, this work investigates a scale-adaptive criterion and introduces modifications to the flux evolution of the UGKWP method. In addition to the intrinsic time-based criterion embedded in the time-dependent distribution function of UGKWP, two further criteria-based on spatial resolution and local gradients–are employed to identify the local scale and reduce the computational overhead of particles in representing near-equilibrium gas distributions. Furthermore, by aligning the evolution of hydrodynamic waves with the coefficients in the time–integration flux of the unified gas-kinetic scheme (UGKS), the modified wave representation improves consistency with particle contributions, which is especially critical when flow scales vary significantly across computational cells. The effectiveness of the adaptive UGKWP method is demonstrated through a series of benchmark cases, including hypersonic flows around a cylinder at various inflow Knudsen numbers, hypersonic flow over a slender cavity, side-jet impingement in hypersonic flow, and three-dimensional hypersonic flows over a 70<sup>∘</sup> blunted cone with a cylindrical sting.</div></div>","PeriodicalId":287,"journal":{"name":"Computers & Fluids","volume":"305 ","pages":"Article 106896"},"PeriodicalIF":3.0,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145518588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Direct Poisson solver combining domain decomposition and influence matrix methods and its application to DNS of oscillating grid turbulence 结合域分解和影响矩阵法的直接泊松求解方法及其在振荡网格湍流DNS中的应用

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-10-31 DOI: 10.1016/j.compfluid.2025.106891

Toru Yamada , Ryuga Sumi , Yohei Morinishi

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A solver-agnostic Lagrangian approach for efficient particle tracking in unsteady multiphase flows 非定常多相流中有效粒子跟踪的求解器不可知拉格朗日方法

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-11-11 DOI: 10.1016/j.compfluid.2025.106914

Yimeng Du , Zhendong Jin , Chengjun Zhang , Yan Cui , Yulong Wang , Rongxuan Hu , Peng Gao , Martin Sommerfeld

{"title":"A solver-agnostic Lagrangian approach for efficient particle tracking in unsteady multiphase flows","authors":"Yimeng Du , Zhendong Jin , Chengjun Zhang , Yan Cui , Yulong Wang , Rongxuan Hu , Peng Gao , Martin Sommerfeld","doi":"10.1016/j.compfluid.2025.106914","DOIUrl":"10.1016/j.compfluid.2025.106914","url":null,"abstract":"<div><div>This work introduces a novel one-way coupled Lagrangian Particle Tracking (LPT) approach that demonstrates strong compatibility with various fluid solvers, enabling efficient particle tracking in unsteady flows. By utilizing the standard Visualization Toolkit (VTK) format, this method efficiently manages data by loading sampled instantaneous flow data, significantly reducing computational costs while tracking multiple particle properties. Crucially, this decoupling from fluid solvers allows researchers to rapidly prototype and validate new LPT models without rerunning the underlying CFD simulations, thereby dramatically accelerating iterative model development. Consequently, the method requires that the time interval be sufficiently fine to capture key flow characteristics, while the total time span covers the complete evolutionary process of the flow. Extensive numerical validations confirm its accuracy and versatility across diverse flow scenarios, including Couette and Poiseuille flows, lid-driven cavity flow, backward-facing step flow, and 90° duct bend flow. Its effectiveness in pharmaceutical aerosol applications—encompassing respiratory and dry-powder inhalers—further highlights its scalability and physical fidelity. The approach's flexibility supports the integration of complex physical models and offers a user-friendly interface through the open-source software ParaView®. This innovation not only addresses challenges faced by engineers using commercial Computational Fluid Dynamics (CFD) software but also transforms the research workflow by enabling agile exploration of particle physics, thus expediting discovery timelines in multiphase flow studies.</div></div>","PeriodicalId":287,"journal":{"name":"Computers & Fluids","volume":"305 ","pages":"Article 106914"},"PeriodicalIF":3.0,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145570126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Embedded strong stability preserving Runge-Kutta methods with adaptive time stepping for shock-dominated flows 基于自适应时间步进的冲击控制流嵌入强保稳定龙格-库塔方法

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-11-15 DOI: 10.1016/j.compfluid.2025.106916

Francesco Mario D’Afiero

{"title":"Embedded strong stability preserving Runge-Kutta methods with adaptive time stepping for shock-dominated flows","authors":"Francesco Mario D’Afiero","doi":"10.1016/j.compfluid.2025.106916","DOIUrl":"10.1016/j.compfluid.2025.106916","url":null,"abstract":"<div><div>Accurate time integration of hyperbolic-parabolic systems, particularly in the presence of shocks and steep gradients, remains a central challenge in computational fluid dynamics. In this work, we propose a robust, adaptive time integration framework for discontinuous Galerkin discretizations that combines an embedded third-order Strong Stability Preserving Runge-Kutta method with physics-based shock capturing and novel error control strategies. The proposed method is based on total variation diminishing properties while leveraging a proportional-integral controller for adaptive step-size selection, eliminating the need for empirical CFL tuning. A key innovation lies in the introduction of an entropy-based filtering mechanism that modulates element-wise error estimates, effectively dampening spurious spikes induced by discontinuities. Additionally, the integral term of the PI controller is stabilized using a moving median over a sliding window, enhancing reliability in shock-dominated regimes. The overall methodology requires no parameter tuning beyond a user-defined error tolerance (as it is common in any ordinary differential equation) and is demonstrated to be stable and accurate across a broad range of canonical test cases. Compared to conventional CFL stable solution obtained for the same numerical setups in a previous work, the proposed approach consistently delivers improved accuracy and robustness for high-fidelity simulations in complex compressible flows.</div></div>","PeriodicalId":287,"journal":{"name":"Computers & Fluids","volume":"305 ","pages":"Article 106916"},"PeriodicalIF":3.0,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145615895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Grid resolution requirements for DNS of shock/boundary-layer interactions 激波/边界层相互作用DNS的网格分辨率要求

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-11-04 DOI: 10.1016/j.compfluid.2025.106892

Alessandro Ceci , Andrea Palumbo , Sergio Pirozzoli

{"title":"Grid resolution requirements for DNS of shock/boundary-layer interactions","authors":"Alessandro Ceci , Andrea Palumbo , Sergio Pirozzoli","doi":"10.1016/j.compfluid.2025.106892","DOIUrl":"10.1016/j.compfluid.2025.106892","url":null,"abstract":"<div><div>Direct Numerical Simulation (DNS) of shock-boundary-layer interactions (SBLI) is critical for accurate prediction of turbulence, heat transfer, and separation in high-speed flows. One of the main challenges is selecting a grid resolution that properly resolves both pre- and post-interaction states while maintaining computational efficiency. This study systematically examines the impact of grid resolution on DNS accuracy, with particular focus on the post-interaction region, where turbulence length scales undergo a dramatic reduction-especially under hypersonic flow conditions. Through a series of high-fidelity simulations using grids of increasing resolution, we quantify the consequences of under-resolution on turbulence statistics, skin friction, and heat transfer, and demonstrate that classical DNS criteria remain applicable in SBLI once the viscous length scale reduction across the shock is properly accounted for. To support mesh design, we propose and validate a simple predictive scaling law, based solely on inviscid flow quantities, that estimates this reduction and thus enables a priori resolution requirements to be determined across different configurations. These results go beyond confirming the need for fine grids, providing a predictive tool to guide future DNS and wall-modeled LES of hypersonic SBLI.</div></div>","PeriodicalId":287,"journal":{"name":"Computers & Fluids","volume":"305 ","pages":"Article 106892"},"PeriodicalIF":3.0,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145518902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

High order global flux schemes for general steady state preservation of shallow water moment equations with non-conservative products 具有非保守积的浅水力矩方程一般稳态保持的高阶全局通量格式

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-10-30 DOI: 10.1016/j.compfluid.2025.106887

Mirco Ciallella , Julian Koellermeier

{"title":"High order global flux schemes for general steady state preservation of shallow water moment equations with non-conservative products","authors":"Mirco Ciallella , Julian Koellermeier","doi":"10.1016/j.compfluid.2025.106887","DOIUrl":"10.1016/j.compfluid.2025.106887","url":null,"abstract":"<div><div>Shallow water moment equations are reduced-order models for free-surface flows that allow to represent vertical variations of the velocity profile at the expense of additional evolution equations for a number of additional variables, so called moments. This introduces non-linear non-conservative products in the system, which make the analytical characterization of steady states much harder if not impossible. The lack of analytical steady states poses a challenge for the design of well-balanced schemes, which aim at preserving such steady states as crucial in many applications.</div><div>In this work, we present a family of fully approximately well-balanced, high-order WENO finite volume methods for general hyperbolic balance laws with non-conservative products like the shallow water moment equations, for which no analytical steady states are available. The schemes are based on the flux globalization approach, in which both source terms and non-conservative products are integrated with a tailored high order quadrature in the divergence term. The resulting global flux is then reconstructed instead of the conservative variables to preserve all steady states. Numerical tests show the optimal convergence of the method and a significant error reduction for steady state solutions. Furthermore, we provide a numerical comparison of perturbed steady states for different families of shallow water moment equations, which illustrates the flexibility of our method that is valid for general equations without prior knowledge of steady states.</div></div>","PeriodicalId":287,"journal":{"name":"Computers & Fluids","volume":"305 ","pages":"Article 106887"},"PeriodicalIF":3.0,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145518579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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GPU accelerated vortex-induced vibration simulation using JAX: Efficiency and accuracy strategies 基于JAX的GPU加速涡激振动仿真：效率与精度策略

IF 3 3区工程技术

Computers & Fluids Pub Date : 2026-01-30 Epub Date: 2025-11-13 DOI: 10.1016/j.compfluid.2025.106913

Haiming Zhu , Yuan Yang , Zunfeng Du , Jianxing Yu

{"title":"GPU accelerated vortex-induced vibration simulation using JAX: Efficiency and accuracy strategies","authors":"Haiming Zhu , Yuan Yang , Zunfeng Du , Jianxing Yu","doi":"10.1016/j.compfluid.2025.106913","DOIUrl":"10.1016/j.compfluid.2025.106913","url":null,"abstract":"<div><div>This study presents an immersed boundary-lattice Boltzmann method (IB-LBM) simulation framework for vortex-induced vibration (VIV), implemented using the JAX framework to exploit GPU acceleration. The code is specifically structured to meet JAX’s functional and static requirements, incorporating an efficient multi-block grid refinement scheme and a novel dynamic region approach for immersed boundary calculations. Through systematic benchmarking and convergence studies, we revealed that the present dynamic region approach achieves improved efficiency by reducing computational workload while avoiding excessive dynamic array operations. We demonstrated that the grid refinement setting should be adjusted according to the Reynolds number to maintain accuracy. The results also showed that while grid refinement saves total time-to-solution, parallel efficiency is reduced due to the stalls caused by frequent inter-block communications. Furthermore, we compared fluid-structure coupling strategies, finding that while weak coupling is adequate for amplitude prediction, strong coupling with at least two iterations is necessary to eliminate spurious frequency artifacts in the response. These findings offer practical guidelines for achieving efficient and accurate VIV simulations with IB-LBM on modern GPU platforms.</div></div>","PeriodicalId":287,"journal":{"name":"Computers & Fluids","volume":"305 ","pages":"Article 106913"},"PeriodicalIF":3.0,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145570080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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