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Nikolai A. Magnitskii^*
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1529-1544, 2025, DOI:10.32604/fdmp.2025.067021 - 31 July 2025
（This article belongs to the Special Issue: Traveling Waves, Impulses and Laminar-turbulent Transitions in Fluid Dynamics Equations)
Abstract This paper presents both analytical and numerical studies of the conservative Sawada–Kotera equation and its dissipative generalization, equations known for their soliton solutions and rich chaotic dynamics. These models offer valuable insights into nonlinear wave propagation, with applications in fluid dynamics and materials science, including systems such as liquid crystals and ferrofluids. It is shown that the conservative Sawada–Kotera equation supports traveling wave solutions corresponding to elliptic limit cycles, as well as two- and three-dimensional invariant tori surrounding these cycles in the associated ordinary differential equation (ODE) system. For the dissipative generalized Sawada–Kotera equation, chaotic More >

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KL Vasudev¹, Manish Pandey², Jaan H. Pu^3,*
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1545-1569, 2025, DOI:10.32604/fdmp.2025.065289 - 31 July 2025
Abstract This study presents a comparative analysis of optimisation strategies for designing hull shapes of Autonomous Underwater Vehicles (AUVs), paying special attention to drag, lift-to-drag ratio, and delivered power. A fully integrated optimisation framework is developed accordingly, combining a single-objective Genetic Algorithm (GA) for design parameter generation, Computer-Aided Geometric Design (CAGD) for the creation of hull geometries and associated fluid domains, and a Reynolds-Averaged Navier–Stokes (RANS) solver for evaluating hydrodynamic performance metrics. This unified approach eliminates manual intervention, enabling automated determination of optimal hull configurations. Three distinct optimisation problems are addressed using the proposed methodology. First,… More >

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Hao Tang^1,2,3, Jianchang Yang^1,2,3, Yunxin Zhou^1,2,3, Jianxin Xu^1,2,3,*, Hua Wang^1,2,3
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1571-1600, 2025, DOI:10.32604/fdmp.2025.063741 - 31 July 2025
Abstract This research explores the characteristics of boiling in inclined pipes, a domain of great importance in engineering. Employing an experimental visualization technique, the boiling dynamics of deionized water are examined at varying inclination angles, paying special attention to the emerging flow patterns. The findings demonstrate that the inclination angle significantly impacts flow pattern transitions within the 0° to 90° range. As the heat flux rises, bubbles form in the liquid. The liquid’s inertia extends the bubble-wall contact time, thereby delaying the onset of bulk bubble flow. Beyond a 90° inclination, however, the patterning behavior is… More >

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Zichen Zhang^1,2, Aoyu Zhang¹, Tongtong Qi¹, Xiaoyan Ma^1,2,*
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1601-1610, 2025, DOI:10.32604/fdmp.2025.067414 - 31 July 2025
（This article belongs to the Special Issue: Materials and Energy an Updated Image for 2023)
Abstract This study experimentally investigates the oscillatory dynamics of wind-driven droplets using high-speed imaging to capture droplet profiles within the symmetry plane and to characterize their natural oscillation frequencies. Results reveal that the eigenfrequencies vary spatially due to distinct oscillation modes occurring at different droplet locations. Notably, the fundamental eigenfrequency decreases with reducing droplet volume, while droplet viscosity exerts minimal influence on this frequency. Prior to the onset of motion, the dynamic contact angle consistently remains between the advancing and receding angles. The inertial forces generated by droplet oscillation are found to be significantly greater than More >

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571

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Ya Li^1,*, Min Deng², Shanyi Hao³, Yucong Lin¹, Yu Lu¹
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1611-1622, 2025, DOI:10.32604/fdmp.2025.067497 - 31 July 2025
（This article belongs to the Special Issue: Fluid Mechanics & Thermodynamics in Renewable Energy and HVAC Systems)
Abstract The noise generated by high-speed hair dryers significantly affects user experience, with aerodynamic design playing a crucial role in controlling sound emissions. This study investigates the aerodynamic noise characteristics of a commercial high-speed hair dryer through Computational Fluid Dynamics (CFD) analysis. The velocity field, streamline patterns, and vector distribution within the primary flow path and internal cavity were systematically examined. Results indicate that strong interactions between the wake flow generated by the guide vanes and the straight baffle in the rear flow path induce vortex structures near the outlet, which are primarily responsible for high-frequency More >

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Yu Sang¹, Anqi Du¹, Changqing Ye¹, Jianhua Xiang¹, Yi Chen¹, Yazhou Guo², Le Shen^3,*
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1623-1639, 2025, DOI:10.32604/fdmp.2025.065832 - 31 July 2025
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources III)
Abstract In the context of the global “Carbon Peaking and Carbon Neutrality” initiative, the injection of carbon dioxide (CO₂) into depleted gas reservoirs represents a dual-purpose strategy—facilitating long-term carbon sequestration while enhancing hydrocarbon recovery. However, variations in injection parameters at the wellhead can exert pronounced effects on the temperature and pressure conditions at the bottom of the well. These variations, in turn, influence the geomechanical behavior of reservoir rocks and the displacement efficiency of CO₂ within the formation. Precise prediction of downhole thermodynamic conditions is therefore essential for optimizing injection performance and ensuring reservoir stability. To address… More >

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553

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Yunfeng Zhang, Dong Hu^*, Yuan Liu
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1641-1655, 2025, DOI:10.32604/fdmp.2025.065820 - 31 July 2025
（This article belongs to the Special Issue: Effect of Materials Surface Properties on Fluid Dynamics Behavior)
Abstract To address the challenges of poor surface quality and high energy consumption in marble cutting, this study introduces an auxiliary abrasive jet cutting technology enhanced by the use of polyacrylamide (PAM) as a drag-reducing additive. The effects of feed rate (50–300 mm/min), polymer concentration (0–0.5 g/L), and nozzle spacing (4–12 mm) on kerf width and surface roughness are systematically investigated through an orthogonal experimental design. Results reveal that feed rate emerges as the most significant factor (p < 0.01), followed by PAM concentration and nozzle spacing. The optimal set of parameters, comprising a 200 mm/min feed More >

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599

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Yizhe Han^1,2, Guangjing Huang¹, Fei Xiao¹, Zhiyin Huang^3,*, Yuting Dai¹
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1657-1671, 2025, DOI:10.32604/fdmp.2025.067528 - 31 July 2025
Abstract During high-speed forward flight, helicopter rotor blades operate across a wide range of Reynolds and Mach numbers. Under such conditions, their aerodynamic performance is significantly influenced by dynamic stall—a complex, unsteady flow phenomenon highly sensitive to inlet conditions such as Mach and Reynolds numbers. The key features of three-dimensional blade stall can be effectively represented by the dynamic stall behavior of a pitching airfoil. In this study, we conduct an uncertainty quantification analysis of dynamic stall aerodynamics in high-Mach-number flows over pitching airfoils, accounting for uncertainties in inlet parameters. A computational fluid dynamics (CFD) model… More >

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616

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Shun Chen^1,2,3, Jingyuan Fan¹, Xingyang He^1,2,3,*, Ying Su^1,2,3, Jizhan Chen¹, Yiming Cao¹, Meng Fan¹, Zhihao Liu¹, Zihao Jin^1,2,3, Yubo Li^1,2,3
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1673-1688, 2025, DOI:10.32604/fdmp.2025.065003 - 31 July 2025
（This article belongs to the Special Issue: Low-carbon Civil Engineering Materials: Materials Processing, Fluids and Medium Transport)
Abstract The presence of impurities in phosphogypsum has long impeded its effective utilization, highlighting the need for energy-efficient and sustainable purification methods. This study proposes a novel purification strategy that synergistically combines pH regulation and micelle-assisted treatment to create an optimized microenvironment for impurity removal. Under mechanical grinding conditions, this approach enhances the rheological properties of the phosphogypsum slurries and facilitates the dissolution and removal of impurity ions. Experimental results demonstrate that the synergistic method achieves a remarkable 64.01% increase in whiteness while significantly reducing soluble phosphorus and fluoride content in a single-step process. This technique More >

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Cuiping Yuan^1,2,*, Sicun Zhong^1,3,*, Yijia Wu^1,3, Man Chen⁴, Ying Wang^1,3, Yinping Cao⁵, Jia Chen^1,2
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1689-1710, 2025, DOI:10.32604/fdmp.2025.065151 - 31 July 2025
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources III)
Abstract Field development practices in many shale gas regions (e.g., the Changning region) have revealed a persistent issue of suboptimal reserve utilization, particularly in areas where the effective drainage width of production wells is less than half the inter-well spacing (typically 400–500 m). To address this, infill drilling has become a widely adopted and effective strategy for enhancing reservoir contact and mobilizing previously untapped reserves. However, this approach has introduced significant inter-well interference, complicating production dynamics and performance evaluation. The two primary challenges hindering efficient deployment of infill wells are: (1) the quantitative assessment of hydraulic… More >

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568

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Senchun Miao^1,*, Wenkai Hu¹, Jiangbo Wu¹, Zhengjing Shen¹, Xiaoze Du^1,2,*
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1711-1735, 2025, DOI:10.32604/fdmp.2025.062239 - 31 July 2025
Abstract In Brayton cycle energy storage systems powered by supercritical carbon dioxide (sCO₂), compressors are among the most critical components. Understanding their internal flow loss characteristics is, therefore, essential for enhancing the performance of such systems. This study examines the main sCO₂ compressor from Sandia Laboratory, utilizing entropy production theory to elucidate the sources and distribution of energy losses both across the entire machine and within its key flow components. The findings reveal that turbulent viscous dissipation is the predominant contributor to total entropy production. Interestingly, while the relative importance of the entropy produced by various sources More >

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Yang Sun¹, Runze Yang^2,*
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1737-1751, 2025, DOI:10.32604/fdmp.2025.063103 - 31 July 2025
Abstract The intake system of a racing engine plays a crucial role in determining its performance, particularly in terms of volumetric efficiency, power output, and throttle response. According to Formula Society of Automotive Engineers (FSAE) regulations, the engine intake system must incorporate a 20 mm diameter flow-limiting valve within the intake manifold. This restriction significantly reduces the airflow into the engine, leading to a substantial drop in power output. To mitigate this limitation, the intake system requires a redesign. In this study, theoretical calculations and one-dimensional thermodynamic simulations are employed to determine the optimal parameters for… More >

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886

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Hailong Chen^*, Yu Zhang, Xin Luan, Mingyu Zhang, Guanzhen Tao
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1753-1770, 2025, DOI:10.32604/fdmp.2025.066494 - 31 July 2025
Abstract Fuel injection properties, including the injection rate (temporal aspects) and spray behavior (spatial aspects), play a crucial role in the combustion efficiency and emissions of diesel engines. This study investigates the effects of different ethanol-biodiesel-diesel (EBD) blends on the injection performance in diesel engines. Experimental tests are conducted to examine key injection parameters, such as spray penetration distance, spray cone angle, and droplet size, alongside an analysis of coupling leakage. The main findings are as follows: (1) The injection behavior of ethanol and diesel differs significantly. The addition of ethanol reduces the density, viscosity, and… More >

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Hamed Yousefzadeh Eini, Mohammad Hossein Sabouri, Mojtaba Babaelahi^*
FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.7, pp. 1771-1788, 2025, DOI:10.32604/fdmp.2025.066747 - 31 July 2025
Abstract Heat Recovery Ventilators (HRVs) are essential for improving indoor air quality (IAQ) and reducing energy consumption in residential buildings situated in cold climates. This study considers the efficiency and performance optimization of HRVs under cold climatic conditions, where conventional ventilation systems increase heat loss. A comprehensive numerical model was developed using COMSOL Multiphysics, integrating fluid dynamics, heat transfer, and solid mechanics to evaluate the thermal efficiency and structural integrity of an HRV system. The methodology employed a detailed geometry with tetrahedral elements, temperature-dependent material properties, and coupled governing equations solved under Tehran-specific boundary conditions. A More >

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