Open Access

ARTICLE

Feiyang Liu¹, Yi Zhou¹, Decai Qu², Bowen Zhao^3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.087716
Abstract The effects of heave amplitude and oscillation period on the hydrodynamic performance of a three-dimensional NACA0012 hydrofoil operating beneath a free surface are systematically investigated using an unsteady Reynolds-averaged Navier–Stokes (RANS) framework coupled with the Volume of Fluid (VOF) method. The shear stress transport (SST) turbulence model and an overset mesh technique are employed to resolve the turbulent flow and large-amplitude hydrofoil motion, while grid and time-step convergence studies are performed to establish numerical reliability. The results show that the heaving hydrofoil generates net thrust throughout the investigated parameter range, demonstrating the dominant role of… More >

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ARTICLE

Dapeng Jin^1,2, Yuejiao Wang^3,*, Bin Liu⁴, Yichi Zhang⁵, Sichao Zhang⁴, Pengbo Yin^6,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.089244
Abstract This study develops a sequential numerical modelling framework to elucidate the transient evolution of liquid hydrogen (LH₂) leakage, pool evaporation, hydrogen dispersion, and post-ignition thermal hazards in a representative semi-open railway station. The framework couples a source-term integral model for LH₂ pool evaporation with computational fluid dynamics (CFD), in which the time-dependent liquid-pool radius and evaporation mass flow rate are introduced as transient inlet conditions through a user-defined function. The Realizable k-ε turbulence model and species transport equations are employed to predict the subsequent dispersion of gaseous H₂ within the station environment, accounting for the influence of… More >

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ARTICLE

Chao Liu¹, Jianwu He^2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.086616
Abstract This study investigates the influence of the cavitation coefficient on the internal flow field and pressure fluctuation characteristics of a pump-turbine using numerical simulations validated against experimental measurements. The validated model is then used to analyze hydraulic performance and cavitation-induced flow behavior over a range of cavitation conditions. The results show that cavitation first develops on the suction side of the runner blades near the outlet and progressively reduces hydraulic efficiency as it intensifies. The flow field within the runner is primarily governed by rotor-stator interactions between the runner and guide vanes, resulting in pronounced More >

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Open Access

REVIEW

Liang Yin^1,*, Lei Zhong², Youjia Gao², Yongsheng Zhang², Xiangming Liu², Yun Zeng², Jun Hu², Jie Ding¹
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.085289
Abstract Hypersonic vehicles are subjected to extreme aerodynamic heating, making active cooling technologies a critical component of their thermal protection systems. This paper presents a comprehensive review of the fundamental principles, operating mechanisms, recent research developments, and key technical challenges associated with three major active cooling approaches: regenerative cooling, gas film cooling, and transpiration cooling. The review establishes a comparative framework to support the selection of cooling strategies according to specific mission requirements, while identifying current limitations and outlining priorities for future research. The analysis shows that regenerative cooling is well suited to long-duration missions owing More >

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ARTICLE

Jiabin Wang¹, Rundong Wang¹, Xingda Tong^1,*, Shaopeng Hao¹, Bo Yan², Zhihui Wang^3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.087557
（This article belongs to the Special Issue: Theoretical Foundations and Applications of Multiphase Flow in Pipeline Engineering)
Abstract This study develops a unified, material-specific semi-empirical framework to describe both low-velocity corrosion mitigation and high-velocity erosion-corrosion enhancement in CO₂-containing environments. L360, 20# and X65 steels were investigated using static weight-loss and electrochemical tests, together with dynamic erosion-corrosion experiments and SEM/EDS characterization. Static tests were conducted at total pressures of 3–7 MPa, CO₂ partial pressures of 4–60 kPa, and temperatures of 10–60°C, while dynamic tests were performed at 3.5 MPa total pressure, 40 kPa CO₂ partial pressure, and 25°C, over velocities of 0–50 m/s and impingement angles of 0–80°. Static corrosion rates increased with increasing CO₂ partial… More >

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ARTICLE

Haozhe Zhang¹, Shengjie Wang¹, Jiajia Song¹, Zeqi Chen¹, Suoying He¹, Ming Gao^1,2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.088369
Abstract This study develops and systematically evaluates a hierarchical tree-shaped finned-tube heat exchanger designed to enhance hydrogen absorption in porous metal-hydride (MH) storage reactors. The proposed architecture combines geometrically nested primary, secondary, and tertiary tubes with branched fins to redistribute cooling capacity from the reactor core towards peripheral regions where localized reaction dead zones develop. A validated two-dimensional transient model, incorporating Darcy-law porous-media flow, heat transfer between the MH bed and the aluminium heat-exchanger structure, and LaNi₅ hydriding kinetics, is employed to compare a series of discrete heat-exchanger geometries. The effects of tube-spacing ratio α, primary-tube radius r₀,… More >

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ARTICLE

Shaohui Wang^1,2,*, Minpo Jung^1,*, Zongzheng Jiao¹, Yanmei Xu³
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.085897
（This article belongs to the Special Issue: High-Order Computing and Deep Reinforcement Learning for Multiphase Interfacial Flows)
Abstract This paper develops a Fractal-Constrained Physics-Informed Neural Network (FC-PINN) framework to reinterpret mercury intrusion porosimetry (MIP) data from a fluid-mechanics perspective and to infer multiphase flow parameters and predict permeability in compacted expansive clay. The approach exploits the physical equivalence between mercury intrusion and water–air displacement in unsaturated soils, both of which are governed by the Laplace–Washburn relationship, while incorporating the steady-state Richards equation into the neural-network loss function as a physical constraint. Compacted expansive clay specimens with three void ratios (e = 1.4, 1.5, and 1.6) are considered, and surface fractal dimensions (Ds =… More >

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ARTICLE

Xiangping Liao^*, Ye Xu, Ying Zhao, Langxin Sun
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.087496
（This article belongs to the Special Issue: Advances in Hydraulic Systems: Integrating Hydrostatic, Hydrodynamic, and Hydro-viscous Transmission Technologies)
Abstract This study investigates the oil-groove configuration of composite friction pairs in hydro-viscous clutches (HVCs), with particular emphasis on the effects of gas content and pressure within the oil film on torque transmission under high-slip conditions. A novel C-type composite groove is proposed to improve oil-film distribution and pressure within the friction interface. A three-dimensional gas–liquid two-phase CFD model is developed to account for the effects of radial groove geometry under prescribed flow-rate and slip conditions. The coupled gas-liquid two-phase Navier–Stokes equations are solved numerically to examine the oil-phase distribution and its influence on torque transmission… More >
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ARTICLE

Xiuyang Fan¹, Fuqiang Chen^1,2,3,*, Haicang Wang¹, Jingjing Liu¹
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2026.087295
（This article belongs to the Special Issue: Multiphase Flow in Fluid Machinery)
Abstract This study develops a numerical framework to elucidate how staged perforated plates regulate flow and suppress cavitation in a multi-stage sleeve-type pressure-reducing valve (MSPRV) for nuclear feedwater systems under high-pressure-drop conditions. Steady Reynolds-averaged Navier–Stokes (RANS) simulations, coupled with the standard k–ω turbulence model and the Zwart–Gerber–Belamri cavitation model, were conducted at an inlet pressure of 2 MPa. The effects of outlet back pressure, perforated-plate hole radius, and inter-plate spacing were systematically examined through comparisons of a baseline valve without a perforated plate, single-stage configurations, and two-stage configurations. Lower outlet back pressure was found to concentrate the… More >
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