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  • Open Access

    ARTICLE

    Improved Design of a Hydraulically Expanded Overhead Cylinder for an Automotive Torsion Beam

    Kefan Yang1,*, Youmin Wang1, Kexun Fu1, Jiaqi Chen2

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1317-1338, 2023, DOI:10.32604/fdmp.2023.024265

    Abstract The design of hydro-bulge molds, able to provide hollow parts with special-shaped cross-sections, is still a pretty complicated task (especially for what concerns the design of the related hydraulic system and its “synchronization”). In the present work, this task is addressed through the introduction of a new type of overhead cylinder hydraulic synchronization system, able to correct automatically any deviation from the optimal process. Using the AMESim software, the displacement synchronization curve of the piston rods of the two cylinders is obtained and it is verified that the system is able to implement an automatic deviation correction function by adjusting… More >

  • Open Access

    ARTICLE

    Analysis of the Influence of the Blade Deformation on Wind Turbine Output Power in the Framework of a Bidirectional Fluid-Structure Interaction Model

    Ling Yuan1, Zhenggang Liu2,*, Li Li3, Ming Lin1

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1129-1141, 2023, DOI:10.32604/fdmp.2023.023538

    Abstract The blades of large-scale wind turbines can obviously deform during operation, and such a deformation can affect the wind turbine’s output power to a certain extent. In order to shed some light on this phenomenon, for which limited information is available in the literature, a bidirectional fluid-structure interaction (FSI) numerical model is employed in this work. In particular, a 5 MW large-scale wind turbine designed by the National Renewable Energy Laboratory (NREL) of the United States is considered as a testbed. The research results show that blades’ deformation can increase the wind turbine’s output power by 135 kW at rated working conditions.… More > Graphic Abstract

    Analysis of the Influence of the Blade Deformation on Wind Turbine Output Power in the Framework of a Bidirectional Fluid-Structure Interaction Model

  • Open Access

    ARTICLE

    Numerical Simulation of Aerodynamic Interaction Effects in Coaxial Compound Helicopters

    Maosheng Wang, Yanyang Wang, Yihua Cao*, Qiang Zhang

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1301-1315, 2023, DOI:10.32604/fdmp.2023.023435

    Abstract The so-called coaxial compound helicopter features two rigid coaxial rotors, and possesses high-speed capabilities. Nevertheless, the small separation of the coaxial rotors causes severe aerodynamic interactions, which require careful analysis. In the present work, the aerodynamic interaction between the various helicopter components is investigated by means of a numerical method considering both hover and forward flight conditions. While a sliding mesh method is used to deal with the rotating coaxial rotors, the Reynolds-Averaged Navier-Stokes (RANS) equations are solved for the flow field. The Caradonna & Tung (CT) rotor and Harrington-2 coaxial rotor are considered to validate the numerical method. The… More >

  • Open Access

    ARTICLE

    Comparative Study of Two Materials Combining a Standard Building Material with a PCM

    Marwa El Yassi1,2,*, Ikram El Abbassi1,2, Alexandre Pierre2, Yannick Melinge3

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1283-1290, 2023, DOI:10.32604/fdmp.2022.023183

    Abstract Phase change materials (PCMs) have the ability to store thermal energy and make it available at a later stage to keep indoor temperature within a specific range and achieve better thermal comfort in buildings. This study focuses on the performances of materials obtained by combining a standard building material with a PCM. In particular, two different materials mixed with the same PCM are considered under the same climatic conditions. The related thermal behavior is assessed in the framework of numerical simulations conducted with ANSYS Fluent assuming parameters representative of a city located in Europe. The results show that the addition… More >

  • Open Access

    ARTICLE

    A Comprehensive Method for the Optimization of Cement Slurry and to Avoid Air Channeling in High Temperature and High-Pressure Conditions

    Yanjun Li1, Wandong Zhang1, Jiang Wu1, Yuhao Yang1, Chao Zhang1, Huanqiang Yang2,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1237-1248, 2023, DOI:10.32604/fdmp.2022.023147

    Abstract Air channeling in the annulus between the casing and the cement sheath and/or between the cement sheath and formation is the main factor affecting the safe operation of natural gas wells at high temperatures and pressures. Prevention of this problem requires, in general, excellent anti-channeling performances of the cement sheath. Three methods to predict such anti-channeling performances are proposed here, which use the weightless pressure of cement slurry, the permeability of cement stone and the volume expansion rate of cement sheath as input parameters. Guided by this approach, the anti-channeling performances of the cement slurry are evaluated by means of… More >

  • Open Access

    ARTICLE

    Effect of an Internal Heat Exchanger on the Performances of a Double Evaporator Ejector Refrigeration Cycle

    Rachedi Khadraoui1, Latra Boumaraf1,*, Philippe Haberschill2

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1115-1128, 2023, DOI:10.32604/fdmp.2022.022674

    Abstract A theoretical investigation is presented about a double evaporator ejector refrigeration cycle (DEERC). Special attention is paid to take into account the influence of the sub-cooling and superheating effects induced by an internal heat exchanger (IHX). The ejector is introduced into the baseline cycle in order to mitigate the throttling process losses and increase the compressor suction pressure. Moreover, the IHX has the structure of a concentric counter-flow type heat exchanger and is intentionally used to ensure that the fluid at the compressor inlet is vapor. To assess accurately the influence of the IHX on the DEERC performance, a mathematical… More > Graphic Abstract

    Effect of an Internal Heat Exchanger on the Performances of a Double Evaporator Ejector Refrigeration Cycle

  • Open Access

    ARTICLE

    Numerical Investigation of the Thermal Behavior of a System with a Partition Wall Incorporating a Phase Change Material

    Nisrine Hanchi*, Hamid Hamza, Jawad Lahjomri, Khalid Zniber, Abdelaziz Oubarra

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1227-1236, 2023, DOI:10.32604/fdmp.2023.022530

    Abstract The work deals with the thermal behavior of a conventional partition wall incorporating a phase change material (PCM). The wall separates two environments with different thermal properties. The first one is conditioned, while the adjacent space is characterized by a temperature that changes sinusoidally in time. The effect of the PCM is assessed through a comparative analysis of the cases with and without PCM. The performances are evaluated in terms of dimensionless energy stored within the wall, comfort temperature and variations of these quantities as a function of the amount of PCM and its emplacement. More >

  • Open Access

    ARTICLE

    Numerical Simulation of Dust Removal in the Cyclone Collector of a Straw Crusher Based on a Discrete Phase Model

    Zhuang Wu1,2, Chang Su1,2,*, Hua Xu1,2, Liu Wang1,2

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1143-1157, 2023, DOI:10.32604/fdmp.2022.022496

    Abstract The cyclone dust collector is an important subsystem of straw crushers used in agriculture. In the present study, a new type of dust collector with involute morphology is proposed to obtain better dust removal efficiency with respect to that of classical tangential and spiral dust collectors. A discrete phase model (DPM) method is used in synergy with a turbulence model, and the SIMPLE algorithm to simulate the flow field inside the dust collector and the related particle dynamics. It is shown that the internal flow field features a primary swirl, a secondary swirl and blockage effects. Moreover, for the involute… More > Graphic Abstract

    Numerical Simulation of Dust Removal in the Cyclone Collector of a Straw Crusher Based on a Discrete Phase Model

  • Open Access

    ARTICLE

    An Investigation into the Effects of Oil-Well Cement Expansion Agent on the Integrity of Cement Sheath

    Chunqin Tan1, Shenglai Guo2,3,*, Juanjuan Huang4

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1291-1300, 2023, DOI:10.32604/fdmp.2022.022233

    Abstract Generally, the so-called expansion agent is very effective in eliminating all the micro-annuli that exist between the casing and the cement sheath or between the cement sheath and the formation. However, this approach can detrimentally affect the sealing ability of cement sheath if the expansion agent is used in an unreasonable way. For these reasons, in the present work, numerical simulations have been conducted to analyze the effect of elasticity modulus of cement sheath, the elasticity modulus of formation, the expansion rate of cement, the geo-stress on the micro-annulus caused by cement expansion, and the cement sheath expansion on the… More >

  • Open Access

    ARTICLE

    An Experimental Study on the Reinforcement of Weakly-Consolidated Shallow Formation in Deep Water Using an Epoxy Resin-Based Fluid

    Leiju Tian1, Yuhuan Bu1,*, Huajie Liu1,*, Lingyun Zhao2,3

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1215-1226, 2023, DOI:10.32604/fdmp.2022.022219

    Abstract The mechanical properties of Portland cement differ from the weakly consolidated shallow formation in deep water. This results in undesired abrupt changes in the compressive strength and elastic modulus at the cement–formation interface. In this study, a water-borne epoxy resin was applied as a strengthening material to reinforce the weakly consolidated shallow formation and protect the cement sheath from potential failure. The mechanical properties of the unconsolidated clay were tested, including their changes with increases in the temperature and curing time. In addition, the effects of the seawater, cement slurry alkaline filtrate, and saltwater drilling fluid were evaluated. As confirmed… More >

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