Flow, Turbulence and Combustion最新文献_第3页

Agglomeration Dynamics of Non-Spherical Nanoparticles in Homogeneous Isotropic Turbulence 非球形纳米颗粒在均匀各向同性湍流中的团聚动力学

IF 2.2 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-07-01 DOI: 10.1007/s10494-026-00765-9

Maximilian Karsch, Andreas Kronenburg

引用次数: 0

Impact of Structure-Preserving Discretizations on Compressible Wall-Bounded Turbulence of Thermally Perfect Gases 保结构离散化对热完美气体可压缩壁面湍流的影响

IF 2.2 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-06-26 DOI: 10.1007/s10494-026-00768-6

Alessandro Aiello, Andrea Palumbo, Carlo De Michele, Gennaro Coppola

{"title":"Impact of Structure-Preserving Discretizations on Compressible Wall-Bounded Turbulence of Thermally Perfect Gases","authors":"Alessandro Aiello, Andrea Palumbo, Carlo De Michele, Gennaro Coppola","doi":"10.1007/s10494-026-00768-6","DOIUrl":"10.1007/s10494-026-00768-6","url":null,"abstract":"<div><p>Direct numerical simulations of compressible turbulent channel flow at supersonic and hypersonic Mach numbers are performed using a thermally perfect gas model for <span>(textrm{CO}_2)</span>. The objective is to assess the role of structure-preserving discretizations of the convective terms in high-enthalpy regimes, with particular emphasis on entropy conservation, kinetic-energy preservation, and consistency with the thermodynamic closure. The comparative analysis of various formulations examines their impact on robustness, thermodynamic fluctuations, and turbulence statistics across a range of Mach numbers. Differences among formulations are found to originate primarily in the treatment of thermodynamic variables and progressively influence the dynamical fields as compressibility effects intensify. In particular, the coupling between entropy consistency and pressure discretization is shown to affect Reynolds stresses and mean flow properties in high-speed regimes. Overall, the results indicate that consistency between the numerical formulation and the thermodynamic model contributes significantly to the reliable simulation of high-enthalpy compressible turbulence. The study systematically assesses entropy-conservative discretizations for thermally perfect gases in wall-bounded flows and examines their impact on thermodynamic-dynamic coupling at high Mach numbers.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00768-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

DNS and LES of the Flow Over Periodic Hills with a Remeshed Vortex Method 基于重网格涡旋法的周期性山丘流动的DNS和LES

IF 2.2 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-06-26 DOI: 10.1007/s10494-026-00767-7

Marthe de Crouy-Chanel, Chloé Mimeau, Iraj Mortazavi, Alessandro Mariotti, Maria Vittoria Salvetti

{"title":"DNS and LES of the Flow Over Periodic Hills with a Remeshed Vortex Method","authors":"Marthe de Crouy-Chanel, Chloé Mimeau, Iraj Mortazavi, Alessandro Mariotti, Maria Vittoria Salvetti","doi":"10.1007/s10494-026-00767-7","DOIUrl":"10.1007/s10494-026-00767-7","url":null,"abstract":"<div><p>This study evaluates the capability of a Remeshed Vortex Method (RVM) to accurately simulate complex wall-bounded turbulent flows by performing both Direct Numerical Simulations (DNS) and Large Eddy Simulations (LES) of the flow over periodic hills. The RVM stems from Lagrangian Vortex methods, discretizing the flow fields on numerical particles, where a remeshing procedure is applied to redistribute the particles onto a Cartesian grid in order to control the interparticle distance. In DNS, different algorithmic configurations inherent to the RVM’s remeshing procedure are explored. The RVM shows good accuracy and computational efficiency in terms of mesh resolution and time steps compared to the DNS results reported in literature, despite the limitation of using a uniform Cartesian grid. In the LES framework, first a systematic analysis of the directional splitting sequence in the RVM algorithm for anisotropic flows allows us to select a priori the optimal direction ordering in the operators splitting procedure. Secondly, different subgrid-scale models are selected and assessed, including some models previously evaluated and calibrated in a HIT configuration. Among these, the Variational Multiscale (VMS) eddy-viscosity models and the Spectral Vanishing Viscosity (SVV) approaches, which introduce dissipation only at the smallest resolved vorticity scales, are found to be the most suitable for use with the RVM. In particular, the calibrated VMS Smagorinsky model shows the best performance, confirming our previous findings on the robustness of the model calibration.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323285","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

Generation of Lambda Shaped Flow Region in Laminar Gas Jet Induced by Plasma Propagation 等离子体传播诱导层流气体射流中λ形流区的产生

IF 2.2 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-06-16 DOI: 10.1007/s10494-026-00766-8

Asma Begum, Tatsuo Ishijima, M. R. Pervez, Mohammed Anwer

{"title":"Generation of Lambda Shaped Flow Region in Laminar Gas Jet Induced by Plasma Propagation","authors":"Asma Begum, Tatsuo Ishijima, M. R. Pervez, Mohammed Anwer","doi":"10.1007/s10494-026-00766-8","DOIUrl":"10.1007/s10494-026-00766-8","url":null,"abstract":"<div><p>Atmospheric Pressure Plasma Jet (APPJ) accelerating following the fluid flow is responsible for the modification of the gas flow dynamics. This study investigates the gas flow dynamics in the presence of non-thermal atmospheric pressure plasma jets (APPJs), focusing on the Greek letter lambda shape transition region between laminar and vortex flow regimes. Using Schlieren imaging, we analyzed flow characteristics at different gas flow rates (2 slm, 3 slm, and 4 slm), identified distinct flow regions and the onset of vortex. A small to moderate flow instability around plasma jet is observed. Key parameters, including Reynolds number, electron density, electron drift velocity (~10<sup>5</sup> m/s) and electrohydrodynamic (EHD) forces, are evaluated experimentally to understand their roles in flow instability. Electron and gas temperature estimated from emission data are ~3500 K and ~350 K, respectively. The plasma jet extends past the 50% air admixture on the helium channel, resulting in a lambda-shaped flow. Additionally, variations in the electric field contribute to the instability of the plasma jet is justified.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281170","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

Flow Characteristics of Wall Synthetic Jet Flowing Over a Circular Cylinder 壁面合成射流在圆柱上的流动特性

IF 2.4 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-06-08 DOI: 10.1007/s10494-026-00762-y

Rion Yokota, Takaya Hiruma, Koichi Nishibe, Kotaro Sato

{"title":"Flow Characteristics of Wall Synthetic Jet Flowing Over a Circular Cylinder","authors":"Rion Yokota, Takaya Hiruma, Koichi Nishibe, Kotaro Sato","doi":"10.1007/s10494-026-00762-y","DOIUrl":"10.1007/s10494-026-00762-y","url":null,"abstract":"<div><p>When jet-based flow control, such as stall control and fluidic thrust vectoring, is employed, jet nozzles are commonly installed near a convex-curved surface. Numerous researchers have investigated the most fundamental curved-wall continuous jet. For synthetic jets, although numerous applied studies exist, fundamental investigations on cylindrical walls remain scarce. Synthetic jets have zero net mass flux; the vortex pair generated during the expulsion phase dominates the suction phase and establishes a time-averaged flow downstream. This study clarifies how a cylindrical surface influences the vortex pair and the resulting mean flow. We performed flow visualization using Particle Image Velocimetry and surface-pressure measurements for a synthetic jet issuing tangentially over a cylindrical surface. We examined the effects of stroke length (the distance fluid particle travels at the representative velocity during one oscillation period) and radius of curvature on the flow. The boundary layer on the wall organized into discrete vortices linked to the dimensionless stroke length, and both the time-averaged pressure distribution and separation point on the cylindrical surface depended on it. Moreover, the vortex street and time-averaged-flow characteristics can be parameterized using a nominal dimensionless stroke based on the radius of curvature rather than the slot width typically used as the representative length.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00762-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Advances in Combustion Research 燃烧研究进展

IF 2.4 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-06-04 DOI: 10.1007/s10494-026-00760-0

Mohy S. Mansour, Andrea D’Anna

引用次数: 0

Usage of Green Spectrum-Based Temperature Sensitive Paint for Heat Transfer Measurement 基于绿色光谱的温敏涂料在传热测量中的应用

IF 2.4 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-06-03 DOI: 10.1007/s10494-026-00764-w

Haricharan Pippari, Keesanth Singh Chandrasekaran, Sathesh Mariappan

{"title":"Usage of Green Spectrum-Based Temperature Sensitive Paint for Heat Transfer Measurement","authors":"Haricharan Pippari, Keesanth Singh Chandrasekaran, Sathesh Mariappan","doi":"10.1007/s10494-026-00764-w","DOIUrl":"10.1007/s10494-026-00764-w","url":null,"abstract":"<div><p>Jet impingement cooling is a traditional method that provides higher heat transfer rates for cooling components in many engineering applications to increase the life and efficiency of the components. The present work focuses on the experimental measurement of heat transfer on a flat plate, cooled by an obliquely impinging low-speed jet using a recently developed green-spectrum-based temperature-sensitive paint (TSP). The TSP is used to measure temperature distributions on the hot plate (at 333 K) when subjected to a relatively cold jet (298 K). Surface temperature data are extracted from the TSP luminescence emission captured by a charge-coupled device camera. The experiments are performed for different impingement angles and jet exit Reynolds numbers. Heat flux is calculated using the modified Cook-Felderman method, which employs a semi-infinite and finite thickness model for the hot plate. The obtained heat flux is compared with the commercially available differential thermophile heat flux (point) sensor. Temporal self-similarity in heat flux is observed. The corresponding normalized heat flux is identified. A feedforward artificial neural network is trained to link the normalized heat flux distribution with the experimental parameters.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172278","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

A Sequential RANS/LES Turbulence Modelling Framework for the Gas-Phase Combustion of Grate-Firing Biomass Furnaces 栅格燃烧生物质炉气相燃烧的连续RANS/LES湍流模型框架

IF 2.4 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-06-01 DOI: 10.1007/s10494-026-00758-8

A H M Nazmush Sakib, Madjid Birouk

{"title":"A Sequential RANS/LES Turbulence Modelling Framework for the Gas-Phase Combustion of Grate-Firing Biomass Furnaces","authors":"A H M Nazmush Sakib, Madjid Birouk","doi":"10.1007/s10494-026-00758-8","DOIUrl":"10.1007/s10494-026-00758-8","url":null,"abstract":"<div><p>Research on converting biomass into heat or power has recently plummeted owing to the importance of renewable energy sources in today’s world. Grate-firing biomass combustion furnace technology has attracted much attention due to its capability of accommodating a wide range of biomass fuels. While this technology has been well established, there is still room for improvement, which can be achieved through optimization studies using numerical simulations. Their success, however, depends on their ability to accurately reproduce the flow field inside these biomass combustion systems. Turbulent flow field inside a grate-firing biomass furnace has traditionally been modelled using RANS-based turbulence models. In this study, a sequential RANS/LES modelling framework is proposed as a practical alternative to the widely adopted RANS-based RNG <i>k</i>−ε model, and is assessed as a computationally feasible coarse scale-resolving approach under practical grid limitations rather than as a fully resolved LES. The results showed improved predictions of temperature profiles, species concentrations, and key combustion parameters, including Damköhler number, scalar dissipation rate, and turbulent flame speed. The improved characterization of the turbulent flow field including residence time within the furnace resulted in enhanced prediction of <span>(N{O_x})</span> emission and related intermediate species.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060662","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

A surrogate-based Bayesian framework for parametric calibration of URANS turbulence models informed by anisotropic pressure fluctuations 基于代理的各向异性压力波动的URANS湍流模型参数定标贝叶斯框架

IF 2.4 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-06-01 DOI: 10.1007/s10494-026-00763-x

Ali Eidi, Richard P. Dwight

{"title":"A surrogate-based Bayesian framework for parametric calibration of URANS turbulence models informed by anisotropic pressure fluctuations","authors":"Ali Eidi, Richard P. Dwight","doi":"10.1007/s10494-026-00763-x","DOIUrl":"10.1007/s10494-026-00763-x","url":null,"abstract":"<div><p>Flow-induced vibrations in wall-bounded flows remain a major challenge in many engineering applications. While fully predictive turbulence-induced vibration simulations generally require scale-resolving approaches, unsteady Reynolds-averaged Navier–Stokes (URANS) methods are employed in practice due to their favorable computational cost. However, their predictive reliability is limited by uncertainty in turbulence-model parameters, structural model–form error, and deficiencies in representing turbulent fluctuations. This work presents a surrogate-based Bayesian calibration framework for the SST <span>(k)</span>–<span>(omega)</span> model, incorporating anisotropic pressure-fluctuation reconstruction to quantify and reduce model uncertainty. Global Sobol’ sensitivity analysis, surrogate modeling, and Bayesian inference are combined to identify influential parameters and assimilate high-fidelity reference data. The framework is applied to turbulent channel flow, turbulent annular flow, and a blunt-end cantilevered-rod configuration. Across all cases, the specific dissipation-rate coefficient <span>(alpha_{omega1})</span> and the turbulent kinetic-energy dissipation coefficient <span>(beta^*)</span> consistently dominate variability in mean-flow quantities and reconstructed fluctuation statistics. Bayesian calibration constrains these parameters to consistent regions of the admissible space, while less influential coefficients remain weakly informed. Gaussian process regression and polynomial chaos expansion surrogates yield nearly identical posterior and predictive distributions, demonstrating robustness to surrogate choice. Remaining discrepancies with reference data are attributed primarily to structural turbulence model limitations rather than parametric uncertainty.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00763-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

LES of Multi-Armed Variable Density Jets 多臂变密度射流的LES

IF 2.4 3区工程技术

Flow, Turbulence and Combustion Pub Date : 2026-05-27 DOI: 10.1007/s10494-026-00759-7

Karol Wawrzak, Artur Tyliszczak

{"title":"LES of Multi-Armed Variable Density Jets","authors":"Karol Wawrzak, Artur Tyliszczak","doi":"10.1007/s10494-026-00759-7","DOIUrl":"10.1007/s10494-026-00759-7","url":null,"abstract":"<div><p>Large eddy simulations are performed to investigate the influence of combined axial and helical excitation on the structure and mixing characteristics of variable-density jets. The analysis includes various frequency ratios <span>(mathcal{R})</span>, two Reynolds numbers, and three density ratios between the jet and surrounding flow. Depending on <span>(mathcal{R})</span>, three distinct jet patterns are observed: five-armed, double-spiral and bifurcating. This parameter governs the azimuthal organization of coherent vortical structures, leading to fundamentally different jet shapes and mixing behaviour. The five-armed and double-spiral jets exhibit significantly enhanced entrainment and improved mixing compared to the bifurcating configuration. Entrainment analysis reveals strong suction of ambient fluid in the near field, followed by pronounced radial spreading further downstream. In particular, the double-spiral jet maintains elevated entrainment over a longer streamwise extent and proves especially effective for higher density ratio. A flow uniformity index demonstrates that excitation not only increases the amount of entrained fluid but also promotes its effective mixing into the jet core, leading to rapid homogenization of both mean temperature and its fluctuations. The results highlight the potential of excitation at a tuned <span>(mathcal{R})</span> for controlling jet dynamics and improving mixing.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"116 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00759-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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