Open Access
ARTICLE
Xinli Zhao1,*, Qianhua Xiao2, Xuewei Liu3, Yu Shi4, Xiangji Dou1, Guoqiang Xing1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052646
Abstract Tight oil reservoirs face significant challenges, including rapid production decline, low recovery rates, and a lack of effective energy replenishment methods. In this study, a novel development model is proposed, based on inter-fracture injection following volumetric fracturing and relying on a high-temperature and high-pressure large-scale physical simulation system. Additionally, the CMG (Computer Modelling Group Ltd., Calgary City, Canada) software is also used to elucidate the impact of various single factors on the production of horizontal wells while filtering out the interference of others. The effects of fracture spacing, fracture half-length, and the injection-production ratio are… More >
Open Access
ARTICLE
Kairuo Chen1, He Wang1,*, Xiangliang Wang2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055174
Abstract Pneumatic conveying technology, as an efficient material transportation method, has been widely used in various industrial fields. To study the powder transportation in horizontal ash conveying pipes, this study relies on the Computational Particle Fluid Dynamics (CPFD) numerical method. The characteristics of the gas-solid two-phase flow under continuous air supply conditions are analyzed, and the effects on particle movement of factors such as feed port spacing, inlet air velocity, and the number of discharge ports are explored accordingly. The research results show that when the inlet velocity is 5 m/s, adjacent discharged particles come into More >
Open Access
ARTICLE
Ikram Belmehdi1,*, Boumedienne Beladjine1, Mohamed Djermouni1, Amina Sabeur1, Mohammed El Ganaoui2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.058510
（This article belongs to the Special Issue: Materials and Energy an Updated Image for 2023)
Abstract The objective of this study is to propose an optimal plant design for blue hydrogen production aboard a liquefied natural gas (LNG) carrier. This investigation focuses on integrating two distinct processes—steam methane reforming (SMR) and ship-based carbon capture (SBCC). The first refers to the common practice used to obtain hydrogen from methane (often derived from natural gas), where steam reacts with methane to produce hydrogen and carbon dioxide (CO2). The second refers to capturing the CO2 generated during the SMR process on board ships. By capturing and storing the carbon emissions, the process significantly reduces its… More >
Open Access
ARTICLE
Tao Chen1, Zhengyu Du2, Zihan Liu2, Maoyu Xiao3, Zhe Zhang3, Lei Shi2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.056396
Abstract During the highly transient process of the direct-start in a four-cylinder GDI engine, each cylinder exhibits specific characteristics in terms of in-cylinder conditions and energy demands, necessitating different control for each cylinder. However, recent studies have paid insufficient attention to cylinders other than the first starting cylinder. This paper proposes a comprehensive control strategy based on experimental data from the direct-start process of the second, third, and fourth cylinders, aiming to enhance the characteristics of combustion and emission performance through the optimization of injection timing, equivalence ratio, and ignition timing. The research findings indicate that… More >
Open Access
ARTICLE
Shun Chen1,2,3, Yingjie Wang1, Xingyang He1,2,3,*, Ying Su1,2,3, Yingyuan Pan1, Yimin Cao1, Wentian Wang1, Chao Yang1,2,3, Bo Jiang1,2,3, Shaolin Zhang4
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055697
（This article belongs to the Special Issue: Advances in Solid Waste Processing and Recycling Technologies for Civil Engineering Materials)
Abstract Styrene-butadiene-styrene (SBS) modified asphalt (SA) has long found effective applications in road construction materials. When combined with fillers, SBS-modified asphalt has demonstrated promising resistance to fatigue cracking caused by temperature fluctuations and aging. In this study, molybdenum disulfide (MoS2) and polyphosphoric acid (PPA) were ground in naphthenic oil (NO) and subjected to mechanical activation to create PPA-modified MoS2, referred to as OMS-PPA. By blending various ratios of OMS-PPA with SBS-modified asphalt, composite-modified asphalts were successfully developed to enhance their overall properties. To assess the mechanical characteristics and stability of these modified asphalts, various methods were employed,… More >
Open Access
ARTICLE
Bailong Sun1, Tian Li1,*, Deng Qin1, Yan Li2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055519
（This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)
Abstract High-speed maglev trains (HSMTs) can run at high running speeds due to their unique design. The pressure waves that these trains generate while passing each other are therefore very intense, and can even have safety implications. In order to reduce the transient impact of such waves, the standard k-ε turbulence model is used in this work to assess the effect of railway spacing on the aerodynamic loads, pressure and surrounding flow field of 600 km/h maglev trains passing each other in open air. The sliding mesh technique is used to determine the relative motion between the More >
Open Access
ARTICLE
Haijie Zhang1, Haifeng Zhao2, Ming Jiang3,*, Junwei Pu1, Yuanping Luo1, Weiming Chen1, Tongtong Luo1,4, Zhiqiang Li5, Xinan Yu6
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.053496
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract Pressure control in deep shale gas horizontal wells can reduce the stress sensitivity of hydraulic fractures and improve the estimated ultimate recovery (EUR). In this study, a hydraulic fracture stress sensitivity model is proposed to characterize the effect of pressure drop rate on fracture permeability. Furthermore, a production prediction model is introduced accounting for a non-uniform hydraulic fracture conductivity distribution. The results reveal that increasing the fracture conductivity leads to a rapid daily production increase in the early stages. However, above 0.50 D·cm, a further increase in the fracture conductivity has a limited effect on More >
Open Access
ARTICLE
Jiarui Cheng1,*, Yirong Yang1, Sai Ye2, Yucheng Luo1, Bilian Peng1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.057056
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract During the implementation of CO2 fracturing for oil and gas development, the force transfer effect caused by the unsteady flow of high-pressure CO2 fluid can lead to forced vibration of the tubing and ensuing structural fatigue. In this study, a forced vibration analysis of tubing under CO2 fracturing conditions is carried out by taking into account the fluid-structure coupling and related interaction forces by means of the method of characteristics (MOC). The results show that for every 1 m3/min increase in pumping displacement, the fluid flow rate increases up to 3.67 m/s. The flow pressure in the… More >
Graphic Abstract
Open Access
ARTICLE
Lanxi Zhang1, Yuming Peng1, Yudong Wu2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.056516
（This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)
Abstract The challenge of aerodynamic noise is a key obstacle in the advancement of low-pressure tube ultra-high-speed maglev transportation, demanding urgent resolution. This study utilizes a broadband noise source model to perform a quantitative analysis of the aerodynamic noise produced by ultra-high-speed maglev trains operating in low-pressure environments. Initially, an external flow field calculation model for the ultra-high-speed maglev train is presented. Subsequently, numerical simulations based on the broadband noise source model are used to examine the noise characteristics. The impact of the train speed and pressure level on noise generation is investigated accordingly. Subsequently, a… More >
Open Access
ARTICLE
Shande Li1, Wen’an Zhong1, Shaoxing Yu1, Hao Wang2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.056228
Abstract This paper aims to numerically explore the characteristics of unsteady cavitating flow around a NACA0015 hydrofoil, with a focus on vorticity attributes. The simulation utilizes a homogeneous mixture model coupled with a filter-based density correction turbulence model and a modified Zwart cavitation model. The study investigates the dynamic cavitation features of the thermal fluid around the hydrofoil at various incoming flow velocities. It systematically elucidates the evolution of cavitation and vortex dynamics corresponding to each velocity condition. The results indicate that with increasing incoming flow velocity, distinct cavitation processes take place in the flow field. More >
Open Access
ARTICLE
Haoyu Cui1, Congxin Yang1,2,*, Yanlei Guo1, Tianzhi Lv1, Sen Zhao1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055301
（This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)
Abstract Most of existing methods for the safety assessment of the primary cooling loop of nuclear reactors in conditions of reactor coolant pump (RCP) failure (rotor seizure accident) essentially rely on the combination of one-dimensional theory and experience. This study introduces a novel three-dimensional model of the ‘Hualong-1’ (HPR1000) primary loop and uses the method of matching the resistance characteristics of the tube to ensure that the main pump operates at the rated operating condition. In particular, the three-dimensional unsteady numerical calculation of the RCP behavior in the rotor-seizure accident condition is carried out in the More >
Open Access
ARTICLE
Junwei Han1, Guohua Li1, Wu Zhong1, Yuchen Yang1, Maoheng Li2,3, Zhiwei Chen2,3, Ruichang Ge2,3, Lijuan Huang2,3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.056130
Abstract A comprehensive method to evaluate the factors affecting the production capacity of horizontal wells in Carboniferous volcanic rocks after fracturing is investigated. A systematic approach combining gray correlation analysis, hierarchical analysis and fuzzy evaluation is proposed. In particular, first the incidence of reservoir properties and fracturing parameters on production capacity is assessed. These parameters include reservoir base geological parameters (porosity, permeability, oil saturation, waterproof height) as well as engineering parameters (fracture half-length, fracture height, fracture conductivity, fracture distance). Afterwards, a two-by-two comparison judgment matrix of sensitive parameters is constructed by means of hierarchical analysis, and More >
Open Access
ARTICLE
Haoran Meng1,2,3, Nianxun Li4, Xukui Shen2, Hong Zhang2, Tian Li4,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055389
Abstract The pressure wave generated by an urban-rail vehicle when passing through a tunnel affects the comfort of passengers and may even cause damage to the train and related tunnel structures. Therefore, controlling the train speed in the tunnel is extremely important. In this study, this problem is investigated numerically in the framework of the standard k-ε two-equation turbulence model. In particular, an eight-car urban rail train passing through a tunnel at different speeds (140, 160, 180 and 200 km/h) is considered. The results show that the maximum aerodynamic drag of the head and tail cars is More >
Open Access
ARTICLE
Yanbo Shao1, Xuewen Cao1,*, Wei You1, Shan Zhao1, Zilong Nan2, Jiang Bian1,3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.053774
Abstract Transporting massive quantities of carbon dioxide through a pipeline in its supercritical state is extremely convenient. Because of the unique properties of supercritical carbon dioxide, however, leakage occurring in such conditions can be extremely intricate, resulting in the dispersion area following leakage being influenced by numerous factors. In this study, this problem is addressed in the frame of the so-called Unified Dispersion Model (UDM), and various influential parameters are considered, namely, leakage pressure, leakage temperature, leakage aperture, leakage angle, atmospheric stability, wind speed, and surface roughness. The results show that the supercritical carbon dioxide dispersion More >
Open Access
ARTICLE
Salma Kouzzi1,*, Mouniba Redah1, Souad Morsli2, Mohammed El Ganaoui3, Mohammed Lhassane Lahlaouti1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055890
（This article belongs to the Special Issue: Materials and Energy an Updated Image for 2023)
Abstract This study investigates the potential for enhancing the thermal performance of external walls insulation in warmer climates through the combination of phase change materials (PCMs) and bio-based materials, specifically hemp wool and wood wool. Experimental tests using the heat flow method (HFM), and numerical simulations with ANSYS Fluent software were conducted to assess the dynamic thermal distribution and fluid-mechanical aspects of phase change materials (PCMs) within composite walls. The results demonstrate a notable reduction in peak indoor temperatures, achieving a 58% reduction with hemp wool with a close 40% reduction with wood wool when combined More >
Open Access
ARTICLE
Tatyana P. Lyubimova1, Sergey A. Plotnikov2, Albert N. Sharifulin2, Vladimir Ya. Modorskii2, Sergey S. Neshev2, Stanislav L. Kalyulin2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.054498
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract Transporting and storing hydrogen is a complex technological task. A typical problem relates to the need to minimize the strength of fluid motion and heat transfer near the walls of the container. In this work this problem is tackled numerically assuming an infinite cavity of pipe square cross-section, located in a constant external temperature gradient. In particular, a method based on the application of vibrations to suppress the gravitational convection mechanism is explored. A parametric investigation is conducted and the limits of applicability of the method for small Grashof numbers (10e4) are determined. It is More >
Open Access
ARTICLE
Yuzhe Ma, Jiye Zhang*, Jiawei Shi
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055205
Abstract The large number and dense layout of rail fastening can significantly affect the aerodynamic performance of trains. Utilizing the Improved Delayed Detached Eddy Simulation (IDDES) approach based on the SST (Shear Stress Transport) k-ω turbulent model, this study evaluates the effects of the rail fastening system on the aerodynamic force, slipstream and train wake under crosswind conditions. The results indicate that in such conditions, compared to the model without rails, the rail and the fastening system reduce the drag force coefficient of the train by 1.69%, while the lateral force coefficients increase by 1.16% and… More >
Open Access
ARTICLE
Baohua Li, Yi Ye, Yuanjun Dai*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.054011
Abstract A linear microporous blade tip structure is designed in order to reduce the aerodynamic noise of a wind turbine during operations. Various structures of such a kind are considered and the related aerodynamic noise is determined in the framework of large vortex simulation and acoustic array test methods. The findings demonstrate that various blade tip designs can enhance the vortex trajectory in the tip region and lessen the pressure differential between the blade’s upper and lower surfaces. In particular, the wind turbine’s maximum linear velocity at the blade tip can be increased by 10%–23% while More >
Open Access
ARTICLE
Yao Zhang1, Hong Lan1,3, Jiye Zhang1,*, Lu Cai2, Yuzhe Ma1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055418
（This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)
Abstract In this study, the unsteady Reynolds-averaged Navier–Stokes algorithm coupled with the Discrete Phase Model (DPM) was used to study the accumulation of snow in the bogie region of a high-speed train under crosswind conditions. Moreover, the impact of active blowing schemes on the airflow around the bogie and the dynamics and deposition of snow particles were also assessed. According to the results: in the crosswind environment, active blowing changes the flow field in the bogie area, reducing the flow of air coming from the windward side and bottom of the bogie. The trajectory of snow… More >
Open Access
ARTICLE
Chakar Khadija*, El Mouden Mahmoud, Hajjaji Abdelowahed
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.053458
（This article belongs to the Special Issue: Materials and Energy an Updated Image for 2023)
Abstract The primary objective of this study is to develop an innovative theoretical model to accurately predict the thermophysical properties of hybrid nanofluids designed to enhance cooling in solar panel applications. This research lays the groundwork for our future studies, which will focus on photovoltaic thermal applications. These nanofluids consist of water and nanoparticles of alumina (Al2O3), titanium dioxide (TiO2), and copper (Cu), exploring volumetric concentrations ranging from 0% to 4% for each type of nanoparticle, and up to 10% for total mixtures. The developed model accounts for complex interactions between the nanoparticles and the base fluid, More >
Open Access
ARTICLE
Yanina N. Parshakova*, Andrey Ivantsov
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052396
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract During the manufacturing or processing of materials, large volumes of water of the required quality are often needed. Industrial water treatment and water purification is the process of removing impurities and pollution from the considered medium. To obtain liquid with specified quality parameters, complex systems of filters and treatment facilities are generally used. In this work, the cleaning process for a filtration column is studied. Three-dimensional numerical simulations of flow in a columnar array consisting of a porous medium are conducted. In particular, a model case corresponding to laboratory conditions is examined, with potassium salt… More >
Open Access
ARTICLE
Victor Kozlov1,*, Alsu Zimasova1, Nikolai Kozlov2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.052398
（This article belongs to the Special Issue: Advanced Problems in Fluid Mechanics)
Abstract The behavior of a viscous liquid film on the wall of a rapidly rotating cylinder subjected to angular vibrations is experimentally studied. The cavity is filled with an immiscible low-viscosity liquid of lower density. In the absence of vibrations, the high viscosity liquid covers the inner surface of the cylinder with a relatively thin axisymmetric film; the low-viscosity liquid is located in the cavity interior. It is found that with an increase in the amplitude of rotational vibrations, the axisymmetric interphase boundary loses stability. An azimuthally periodic 2D “frozen wave” appears on the film surface… More >
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