Yangyang Cao, Jiye Zhang^*, Jiawei Shi, Yao Zhang

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1079-1098, 2025, DOI:10.32604/fdmp.2025.060429 - 30 May 2025

Abstract The pantograph area is a critical source of aerodynamic noise in high-speed trains, generating noise both directly and through its cavity, a factor that warrants considerable attention. One effective method for reducing aerodynamic noise within the pantograph cavity involves the introduction of a jet at the leading edge of the cavity. This study investigates the mechanisms driving cavity aerodynamic noise under varying jet velocities, using Improved Delayed Detached Eddy Simulation (IDDES) and Ffowcs Williams-Hawkings (FW-H) equations. The numerical simulations reveal that an increase in jet velocity results in a higher elevation of the shear layer… More >

Qi Deng¹, Qi Ruan², Bo Zeng¹, Qiang Liu³, Yi Song¹, Shen Cheng¹, Huiying Tang^2,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1201-1219, 2025, DOI:10.32604/fdmp.2025.060311 - 30 May 2025

Abstract Over more than a decade of development, medium to deep shale gas reservoirs have faced rapid production declines, making sustained output challenging. To harness remaining reserves effectively, advanced fracturing techniques such as infill drilling are essential. This study develops a complex fracture network model for dual horizontal wells and a four-dimensional in-situ stress evolution model, grounded in elastic porous media theory. These models simulate and analyze the evolution of formation pore pressure and in-situ stress during production. The investigation focuses on the influence of infill well fracturing timing on fracture propagation patterns, individual well productivity, and… More >

Chinedu Nwaigwe^1,2,*, Abdon Atangana²

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1239-1259, 2025, DOI:10.32604/fdmp.2025.059925 - 30 May 2025

Abstract In the early stages of oil exploration, oil is produced through processes such as well drilling. Later, hot water may be injected into the well to improve production. A key challenge is understanding how the temperature and velocity of the injected hot water affect the production rate. This is the focus of the current study. It proposes variable-viscosity mathematical models for heat and water saturation in a reservoir containing Bonny-light crude oil, with the aim of investigating the effects of water temperature and velocity on the recovery rate. First, two sets of experimental data are… More >

Tao Wang^1,2, Haiyang Yu^1,*, Jie Gao², Fei Wang², Xinlong Zhang^3,*, Hao Yang², Guirong Di², Pengrun Wang²

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1191-1200, 2025, DOI:10.32604/fdmp.2025.058865 - 30 May 2025

Abstract Oilfields worldwide are increasingly grappling with challenges such as early water breakthrough and high water production, yet direct, targeted solutions remain elusive. In recent years, chemical flooding techniques designed for tertiary oil recovery have garnered significant attention, with microgel flooding emerging as a particularly prominent area of research. Despite its promise, the complex mechanisms underlying microgel flooding have been rarely investigated numerically. This study aims to address these gaps by characterizing the distribution of microgel concentration and viscosity within different pore structures. To enhance the accuracy of these characterizations, the viscosity of microgels is adjusted More >

Yu Zhang¹, Shang-Zhen Yu², Jia-Jia Yu^2,3,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1151-1169, 2025, DOI:10.32604/fdmp.2025.057804 - 30 May 2025

Abstract RP-3 is a kind of aviation kerosene commonly used in hypersonic and scramjet engines due to its superior thermal stability, high energy density, and ability to act as a coolant before combustion. However, it is known that coke can be generated during the cooling process as a carbonaceous deposition on metal walls and its effects on the cooling performance are still largely unknown. To explore the influence mechanism of porous coke on heat transfer characteristics of supercritical RP-3 in the regenerative cooling channel, a series of computational simulations were conducted via a three-dimensional CFD… More >

Liang Ai¹, Mingyue Li², Lumin Chen¹, Yihua Gao², Yi Sun¹, Yue Wu¹, Fuping Qian^1,*, Jinli Lu², Naijin Huang³

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.5, pp. 1171-1190, 2025, DOI:10.32604/fdmp.2025.055985 - 30 May 2025

Abstract In this study, Computational Fluid Dynamics (CFD) together with a component transport model are exploited to investigate the influence of dimensionless parameters, involving the height of the rectifier grid and the installation height of the first catalyst layer, on the flow field and the overall denitration efficiency of a cement kiln’s SCR (Selective catalytic reduction) denitrification reactor. It is shown that accurate numerical results can be obtained by fitting the particle size distribution function to the actual cement kiln fly ash and implementing a non-uniform particle inlet boundary condition. The relative error between denitration More >

Yuyao Li¹, Mingmin He¹, Mingjie Cai¹, Shiqian Xu^2,*

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.4, pp. 799-817, 2025, DOI:10.32604/fdmp.2025.062862 - 06 May 2025

Abstract In ultra-deep and large well sections, high collapse stresses and diminished annular return velocity present significant challenges to wellbore cleaning. With increasing depth, rising temperature and pressure constrain the regulation of displacement and drilling fluid rheology, impairing the fluid’s capacity to transport cuttings effectively. A precise understanding of cuttings settlement behavior and terminal velocity is therefore essential for optimizing their removal. This study accounts for variations in wellbore temperature and pressure, incorporates non-spherical cuttings and wellbore diameter parameters, and develops accordingly a simplified model to predict terminal settlement velocity. The cuttings carrying ratio is introduced… More > Graphic Abstract

Alexey Vjatkin^*, Svyatoslav Petukhov, Victor Kozlov

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.4, pp. 783-798, 2025, DOI:10.32604/fdmp.2025.062535 - 06 May 2025

Abstract Time-averaged thermal convection in a rotating horizontal annulus with a higher temperature at its inner boundary is studied. The centrifugal force plays a stabilizing role, while thermal convection is determined by the “thermovibrational mechanism”. Convective flow is excited due to oscillations of a non-isothermal rotating fluid. Thermal vibrational convection manifests in the form of two-dimensional vortices elongated along the axis of rotation, which develop in a threshold manner with an increase in the amplitude of fluid oscillations. The objective of the present study is to clarify the nature of another phenomenon, i.e., three-dimensional convective vortices… More >

Anna Chiara Uggenti¹, Giorgio Rech², Raffaella Gerboni^2,*, Gianmario Ledda², Amedeo Aliberti¹, Claudia Vivalda³, Emanuela Bruno², Andrea Carpignano²

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.4, pp. 757-782, 2025, DOI:10.32604/fdmp.2025.062347 - 06 May 2025

Abstract The paper presents an innovative approach to studying the reuse of a decommissioned natural gas production platform for the seasonal storage and extraction of a hydrogen-methane (H₂-CH₄) mixture from a depleted reservoir. The reuse plan involves removing outdated equipment from the platform’s decks while retaining essential components such as wellheads and separators. Exploiting a depleted reservoir for the injection of an H₂-CH₄ mixture requires a thorough understanding of its specific characteristics. This paper focuses on the engineering approach adopted in the basic design phase for such a conversion, providing recommendations and HSE guidelines. Given the hazardous… More >

Dapeng Zhang^*, Yifan Xie, Yining Zhang, Zhengjie Liang, Yutao Tian

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.4, pp. 697-739, 2025, DOI:10.32604/fdmp.2025.061829 - 06 May 2025

Abstract Airfoil structures play a crucial role across numerous scientific and technological disciplines, with the transition to turbulence and stall onset remaining key challenges in aerodynamic research. While experimental techniques often surpass numerical simulations in accuracy, they still present notable limitations. This paper begins by elucidating the fundamental principles of transition, dynamic stall, and airfoil behavior. It then provides a systematic review of six major experimental methodologies and examines the emerging role of artificial intelligence in this domain. By identifying key challenges and limitations, the study proposes strategic advancements to address these issues, offering a foundational More > Graphic Abstract