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  • Open Access

    ARTICLE

    Experimental Investigation of Wave–Current Loads on a Bridge Shuttle-Shaped Cap–Pile Foundation

    Chenkai Hong1,2,*, Zhongda Lyu2,*, Fei Wang2, Zhuo Zhao2, Lei Wang2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.042685
    Abstract To scrutinize the characteristics of wave–current loads on a bridge shuttle-shaped cap–pile foundation, a 1:125 test model was considered in a laboratory flume. The inline, transverse and vertical wave–current forces acting on the shuttle-shaped cap–pile group model were measured considering both random waves and a combination of random waves with a current. The experimental results have shown that the wave–current forces can be well correlated with the wave height, the wavelength, the current velocity, the incident direction and the water level in the marine environment. An increase in the current velocity can lead to a sharp increase in the inline… More >

  • Open Access

    ARTICLE

    Phase Transition in a Dense Swarm of Self-Propelled Bots

    Dmitry Bratsun*, Kirill Kostarev
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048206
    (This article belongs to this Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract

    Swarms of self-organizing bots are becoming important elements in various technical systems, which include the control of bacterial cyborgs in biomedical applications, technologies for creating new metamaterials with internal structure, self-assembly processes of complex supramolecular structures in disordered media, etc. In this work, we theoretically study the effect of sudden fluidization of a dense group of bots, each of which is a source of heat and follows a simple algorithm to move in the direction of the gradient of the global temperature field. We show that, under certain conditions, an aggregate of self-propelled bots can fluidize, which leads to a… More >
    Graphic Abstract

    Phase Transition in a Dense Swarm of Self-Propelled Bots

  • Open Access

    ARTICLE

    Influence of Ultra Fine Glass Powder on the Properties and Microstructure of Mortars

    Wei Chen*, Dingdan Liu, Yue Liang
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.046335
    (This article belongs to this Special Issue: Advances in Solid Waste Processing and Recycling Technologies for Civil Engineering Materials)
    Abstract This study focuses on the effect of ultrafine waste glass powder on cement strength, gas permeability and pore structure. Varying contents were considered, with particle sizes ranging from 2 to 20 μm. Moreover, alkali activation was considered to ameliorate the reactivity and cementitious properties, which were assessed by using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and specific surface area pore size distribution analysis. According to the results, without the addition of alkali activators, the performance of glass powder mortar decreases as the amount of glass powder increases, affecting various aspects such as strength and resistance to gas permeability.… More >

  • Open Access

    ARTICLE

    Numerical Simulation of Oil-Water Two-Phase Flow in Low Permeability Tight Reservoirs Based on Weighted Least Squares Meshless Method

    Xin Liu1,*, Kai Yan2, Bo Fang3, Xiaoyu Sun3, Daqiang Feng4, Li Yin5
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047922
    Abstract In response to the complex characteristics of actual low-permeability tight reservoirs, this study develops a meshless-based numerical simulation method for oil-water two-phase flow in these reservoirs, considering complex boundary shapes. Utilizing radial basis function point interpolation, the method approximates shape functions for unknown functions within the nodal influence domain. The shape functions constructed by the aforementioned meshless interpolation method have δ-function properties, which facilitate the handling of essential aspects like the controlled bottom-hole flow pressure in horizontal wells. Moreover, the meshless method offers greater flexibility and freedom compared to grid cell discretization, making it simpler to discretize complex geometries. A… More >

  • Open Access

    ARTICLE

    Study on the Relationship between Structural Aspects and Aerodynamic Characteristics of Archimedes Spiral Wind Turbines

    Yuanjun Dai1,2,3,*, Zetao Deng1, Baohua Li2, Lei Zhong1, Jianping Wang1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.046828
    (This article belongs to this Special Issue: Aerodynamic Analysis and Optimal Design of Fluid Machinery)
    Abstract A combined experimental and numerical research study is conducted to investigate the complex relationship between the structure and the aerodynamic performances of an Archimedes spiral wind turbine (ASWT). Two ASWTs are considered, a prototypical version and an improved version. It is shown that the latter achieves the best aerodynamic performance when the spread angles at the three sets of blades are α1 = 30°, α2 = 55°, α3 = 60°, respectively and the blade thickness is 4 mm. For a velocity V = 10 m/s, a tip speed ratio (TSR) = 1.58 and 2, the maximum CP values are 0.223… More >
    Graphic Abstract

    Study on the Relationship between Structural Aspects and Aerodynamic Characteristics of Archimedes Spiral Wind Turbines

  • Open Access

    ARTICLE

    Applying the Shearlet-Based Complexity Measure for Analyzing Mass Transfer in Continuous-Flow Microchannels

    Elena Mosheva1,*, Ivan Krasnyakov2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049146
    (This article belongs to this Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract Continuous-flow microchannels are widely employed for synthesizing various materials, including nanoparticles, polymers, and metal-organic frameworks (MOFs), to name a few. Microsystem technology allows precise control over reaction parameters, resulting in purer, more uniform, and structurally stable products due to more effective mass transfer manipulation. However, continuous-flow synthesis processes may be accompanied by the emergence of spatial convective structures initiating convective flows. On the one hand, convection can accelerate reactions by intensifying mass transfer. On the other hand, it may lead to non-uniformity in the final product or defects, especially in MOF microcrystal synthesis. The ability to distinguish regions of convective… More >

  • Open Access

    ARTICLE

    An Investigation into the Performances of Cement Mortar Incorporating Superabsorbent Polymer Synthesized with Kaolin

    Xiao Huang1,2, Jin Yang3,*
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.046360
    (This article belongs to this Special Issue: Advances in Solid Waste Processing and Recycling Technologies for Civil Engineering Materials)
    Abstract Cement-based materials are fundamental in the construction industry, and enhancing their properties is an ongoing challenge. The use of superabsorbent polymers (SAP) has gained significant attention as a possible way to improve the performance of cement-based materials due to their unique water-absorption and retention properties. This study investigates the multifaceted impact of kaolin intercalation-modified superabsorbent polymers (K-SAP) on the properties of cement mortar. The results show that K-SAP significantly affects the cement mortar’s rheological behavior, with distinct phases of water absorption and release, leading to changes in workability over time. Furthermore, K-SAP alters the hydration kinetics, delaying the exothermic peak… More >

  • Open Access

    ARTICLE

    Study of a Hydraulic Jump in an Asymmetric Trapezoidal Channel with Different Sluice Gates

    Bouthaina Debabeche1,2,*, Sonia Cherhabil3
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047403
    Abstract In this study, the main properties of the hydraulic jump in an asymmetric trapezoidal flume are analyzed experimentally, including the so-called sequent depths, characteristic lengths, and efficiency. In particular, an asymmetric trapezoidal flume with a length of 7 m and a width of 0.304 m is considered, with the bottom of the flume transversely inclined at an angle of m = 0.296 and vertical lateral sides. The corresponding inflow Froude number is allowed to range in the interval (1.40 < F1 < 6.11). The properties of this jump are compared to those of hydraulic jumps in channels with other types… More >

  • Open Access

    ARTICLE

    A Gasification Technology to Combine Oil Sludge with Coal–Water Slurry: CFD Analysis and Performance Determination

    Xulei Wu1, Hailong Yu1,*, Panrong Wu1, Chaoqian Wang1, Haiqun Chen1, Yunlan Sun1, He Zheng2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047092
    Abstract The development of more environment-friendly ways to dispose of oil sludge is currently regarded as a hot topic. In this context, gasification technologies are generally seen as a promising way to combine oil sludge with coal–water slurry (CWS) and generate resourceful fuel. In this study, a novel five-nozzle gasifier reactor was analyzed by means of a CFD (Computational fluid dynamic) method. Among several influential factors, special attention was paid to the height-to-diameter ratio of the gasifier and the mixing ratio of oil sludge, which are known to have a significant impact on the flow field, temperature distribution and gasifier performances.… More >

  • Open Access

    ARTICLE

    An Experimental Analysis of Gas-Liquid Flow Breakdown in a T-Junction

    Lihui Ma1,*, Zhuo Han1, Wei Li1, Guangfeng Qi1, Ran Cheng2, Yuanyuan Wang1, Xiangran Mi3, Xiaohan Zhang1, Yunfei Li1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.046405
    (This article belongs to this Special Issue: Multiphase Flow and Vortex Dynamics in Fluid Machinery)
    Abstract When a gas-liquid two-phase flow (GLTPF) enters a parallel separator through a T-junction, it generally splits unevenly. This phenomenon can seriously affect the operation efficiency and safety of the equipment located downstream. In order to investigate these aspects and, more specifically, the so-called bias phenomenon (all gas and liquid flowing to one pipe, while the other pipe is a liquid column that fluctuates up and down), laboratory experiments were carried out by using a T-junction connected to two parallel vertical pipes. Moreover, a GLTPF prediction model based on the principle of minimum potential energy was introduced. The research results indicate… More >

  • Open Access

    ARTICLE

    Effects of Different Concentrations of Sulfate Ions on Carbonate Crude Oil Desorption: Experimental Analysis and Molecular Simulation

    Nannan Liu*, Hengchen Qi, Hui Xu, Yanfeng He
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048354
    Abstract

    Low salinity water containing sulfate ions can significantly alter the surface wettability of carbonate rocks. Nevertheless, the impact of sulfate concentration on the desorption of oil film on the surface of carbonate rock is still unknown. This study examines the variations in the wettability of the surface of carbonate rocks in solutions containing varying amounts of sodium sulfate and pure water. The problem is addressed in the framework of molecular dynamics simulation (Material Studio software) and experiments. The experiment’s findings demonstrate that sodium sulfate can increase the rate at which oil moisture is turned into water moisture. The final contact… More >

  • Open Access

    ARTICLE

    Numerical Analysis of Permeability of Functionally Graded Scaffolds

    Dmitry Bratsun*, Natalia Elenskaya, Ramil Siraev, Mikhail Tashkinov
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.047928
    (This article belongs to this Special Issue: Advanced Problems in Fluid Mechanics)
    Abstract In this work, we numerically study the hydrodynamic permeability of new-generation artificial porous materials used as scaffolds for cell growth in a perfusion bioreactor. We consider two popular solid matrix designs based on triply periodic minimal surfaces, the Schwarz P (primitive) and D (diamond) surfaces, which enable the creation of materials with controlled porosity gradients. The latter property is crucial for regulating the shear stress field in the pores of the scaffold, which makes it possible to control the intensity of cell growth. The permeability of functionally graded materials is studied within the framework of both a microscopic approach based… More >
    Graphic Abstract

    Numerical Analysis of Permeability of Functionally Graded Scaffolds

  • Open Access

    ARTICLE

    Impact of Osmotic Pressure on Seepage in Shale Oil Reservoirs

    Lijun Mu, Xiaojia Xue, Jie Bai*, Xiaoyan Li, Xueliang Han
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.049013
    (This article belongs to this Special Issue: Solid, Fluid, and Thermal Dynamics in the Development of Unconventional Resources )
    Abstract Following large-scale volume fracturing in shale oil reservoirs, well shut-in measures are generally employed. Laboratory tests and field trials have underscored the efficacy of fracturing fluid imbibition during the shut-in phase in augmenting shale oil productivity. Unlike conventional reservoirs, shale oil reservoirs exhibit characteristics such as low porosity, low permeability, and rich content of organic matter and clay minerals. Notably, the osmotic pressure effects occurring between high-salinity formation water and low-salinity fracturing fluids are significant. The current understanding of the mobilization patterns of crude oil in micro-pores during the imbibition process remains nebulous, and the mechanisms underpinning osmotic pressure effects… More >

  • Open Access

    ARTICLE

    Transient Analysis of a Reactor Coolant Pump Rotor Seizure Nuclear Accident

    Mengdong An1, Weiyuan Zhong1, Wei Xu2, Xiuli Wang1,*
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.046604
    (This article belongs to this Special Issue: Multiphase Flow and Vortex Dynamics in Fluid Machinery)
    Abstract The reactor coolant pump (RCP) rotor seizure accident is defined as a short-time seizure of the RCP rotor. This event typically leads to an abrupt flow decrease in the corresponding loop and an ensuing reactor and turbine trip. The significant reduction of core coolant flow while the reactor is being operated at full load can have very negative consequences. This potentially dangerous event is typically characterized by a complex transient behavior in terms of flow conditions and energy transformation, which need to be analyzed and understood. This study constructed transient flow and rotational speed mathematical models under various degrees of… More >

  • Open Access

    ARTICLE

    A Study on the Performances of Solar Air Collectors Having a Hemispherical Dimple on the Absorber Plate

    Shuilian Li1, Fan Zeng1, Xinli Wei2,*
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.043614
    Abstract In order to increase the efficiency of solar air collectors, a new variant with a protrusion is proposed in this study, and its performances are analyzed from two points of view, namely, in terms of optics and thermodynamics aspects. By comparing and analyzing the light paths of the protrusion and the dimple, it can be concluded that when sunlight shines on the dimple, it is reflected and absorbed multiple times, whereas for the sunlight shining on the protrusion, there is no secondary reflection or absorption of light. When the lighting area and the properties of the surfaces are the same,… More >

  • Open Access

    ARTICLE

    A Well Productivity Model for Multi-Layered Marine and Continental Transitional Reservoirs with Complex Fracture Networks

    Huiyan Zhao1, Xuezhong Chen1, Zhijian Hu2,*, Man Chen1, Bo Xiong3, Jianying Yang1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.048840
    (This article belongs to this Special Issue: Advances in Seepage Mechanism and Numerical Simulation of Unconventional Reservoirs)
    Abstract Using the typical characteristics of multi-layered marine and continental transitional gas reservoirs as a basis, a model is developed to predict the related well production rate. This model relies on the fractal theory of tortuous capillary bundles and can take into account multiple gas flow mechanisms at the micrometer and nanometer scales, as well as the flow characteristics in different types of thin layers (tight sandstone gas, shale gas, and coalbed gas). Moreover, a source-sink function concept and a pressure drop superposition principle are utilized to introduce a coupled flow model in the reservoir. A semi-analytical solution for the production… More >

  • Open Access

    ARTICLE

    Influence of Polyaluminum Chloride Residue on the Strength and Microstructure of Cement-Based Materials

    Ping Xu1,*, Zhiwei Zhang1, Zhenguo Hou2,3, Mankui Zheng1, Jin Tong1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.046183
    Abstract In this paper, cement and dechlorinated Polyaluminum Chloride Residue (PACR) have been used to prepare a net slurry and mortar specimens. Two hydration activity indicators have been used to quantitatively analyze the dechlorinated PACR hydration activity. In particular, the effect of dechlorinated PACR content on the compressive strength of mortar has been assessed by means of compressive strength tests. Moreover, X-ray diffraction (XRD) and scanning electron microscopy (SEM) have been employed to observe the microstructure of the considered hydration products. The following results have been obtained. The 28th day activity index of the dechlorinated PACR is 75%, and therefore it… More >

  • Open Access

    ARTICLE

    An Experimental Study on the Effect of a Nanofluid on Oil-Water Relative Permeability

    Hui Tian1, Dandan Zhao1, Yannan Wu2,3,*, Xingyu Yi1, Jun Ma1, Xiang Zhou4
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.044833
    Abstract

    The low porosity and low permeability of tight oil reservoirs call for improvements in the current technologies for oil recovery. Traditional chemical solutions with large molecular size cannot effectively flow through the nano-pores of the reservoir. In this study, the feasibility of Nanofluids has been investigated using a high pressure high temperature core-holder and nuclear magnetic resonance (NMR). The results of the experiments indicate that the specified Nanofluids can enhance the tight oil recovery significantly. The water and oil relative permeability curve shifts to the high water saturation side after Nanofluid flooding, thereby demonstrating an increase in the water wettability… More >

  • Open Access

    ARTICLE

    Structure Optimization of a Tesla Turbine Using an Organic Rankine Cycle Technology

    Yongguo Li1,2, Caiyin Xu1,2,*, Can Qin1,2, Dingjian Zheng1,2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.044804
    Abstract The so-called ORC (Organic Rankine Cycle) heat recovery technology has attracted much attention with regard to medium and low temperature waste heat recovery. In the present study, it is applied to a Tesla turbine. At the same time, the effects of the disc speed, diameter and inter-disc gap on the internal flow field and output power of the turbine are also investigated by means of CFD (Computational Fluid Dynamics) numerical simulation, by which the pressure, velocity, and output efficiency of the internal flow field are obtained under different internal and external conditions. The highest efficiency (66.4%) is obtained for a… More >

  • Open Access

    ARTICLE

    A Novel Method for Determining the Void Fraction in Gas-Liquid Multi-Phase Systems Using a Dynamic Conductivity Probe

    Xiaochu Luo1, Xiaobing Qi2, Zhao Luo3, Zhonghao Li4, Ruiquan Liao1, Xingkai Zhang1,*
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.045737
    Abstract Conventional conductivity methods for measuring the void fraction in gas-liquid multiphase systems are typically affected by accuracy problems due to the presence of fluid flow and salinity. This study presents a novel approach for determining the void fraction based on a reciprocating dynamic conductivity probe used to measure the liquid film thickness under forced annular-flow conditions. The measurement system comprises a cyclone, a conductivity probe, a probe reciprocating device, and a data acquisition and processing system. This method ensures that the flow pattern is adjusted to a forced annular flow, thereby minimizing the influence of complex and variable gas-liquid flow… More >

  • Open Access

    ARTICLE

    Evaluation of Well Spacing for Primary Development of Fractured Horizontal Wells in Tight Sandstone Gas Reservoirs

    Fang Li1,*, Juan Wu1, Haiyong Yi2, Lihong Wu2, Lingyun Du1, Yuan Zeng1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.043256
    (This article belongs to this Special Issue: Solid, Fluid, and Thermal Dynamics in the Development of Unconventional Resources )
    Abstract Methods for horizontal well spacing calculation in tight gas reservoirs are still adversely affected by the complexity of related control factors, such as strong reservoir heterogeneity and seepage mechanisms. In this study, the stress sensitivity and threshold pressure gradient of various types of reservoirs are quantitatively evaluated through reservoir seepage experiments. On the basis of these experiments, a numerical simulation model (based on the special seepage mechanism) and an inverse dynamic reserve algorithm (with different equivalent drainage areas) were developed. The well spacing ranges of Classes I, II, and III wells in the Q gas field are determined to be… More >

  • Open Access

    ARTICLE

    Optimal Design of High-Speed Partial Flow Pumps using Orthogonal Tests and Numerical Simulations

    Jiaqiong Wang1,2, Tao Yang1, Chen Hu1, Yu Zhang3,*, Ling Zhou1,2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.045825
    Abstract To investigate the influence of structural parameters on the performances and internal flow characteristics of partial flow pumps at a low specific speed of 10000 rpm, special attention was paid to the first and second stage impeller guide vanes. Moreover, the impeller blade outlet width, impeller inlet diameter, blade inclination angle, and number of blades were considered for orthogonal tests. Accordingly, nine groups of design solutions were formed, and then used as a basis for the execution of numerical simulations (CFD) aimed at obtaining the efficiency values and heads for each design solution group. The influence of impeller geometric parameters… More >

  • Open Access

    ARTICLE

    Study on the Impact of Massive Refracturing on the Fracture Network in Tight Oil Reservoir Horizontal Wells

    Jianchao Shi1,2, Yanan Zhang3, Wantao Liu1,2, Yuliang Su3,*, Jian Shi1,2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.044500
    (This article belongs to this Special Issue: Solid, Fluid, and Thermal Dynamics in the Development of Unconventional Resources )
    Abstract Class III tight oil reservoirs have low porosity and permeability, which are often responsible for low production rates and limited recovery. Extensive repeated fracturing is a well-known technique to fix some of these issues. With such methods, existing fractures are refractured, and/or new fractures are created to facilitate communication with natural fractures. This study explored how different refracturing methods affect horizontal well fracture networks, with a special focus on morphology and related fluid flow changes. In particular, the study relied on the unconventional fracture model (UFM). The evolution of fracture morphology and flow field after the initial fracturing were analyzed… More >

  • Open Access

    ARTICLE

    Effects of Temperature and Liquid Nitrogen (LN2) on Coal’s Mechanical and Acoustic Emission (AE) Properties

    Teng Teng1,2, Yuhe Cai3, Linchao Wang3,*, Yanzhao Zhu2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.044532
    (This article belongs to this Special Issue: Fluids, Materials and Related Disasters in Geotechnical and Mining Engineering)
    Abstract Liquid nitrogen has shown excellent performances as a good fracturing medium in the extraction of unconventional natural gas, and its application in coalbed methane extraction is currently a research hotspot. This study focuses on the acoustic emission properties of coal specimens treated utilizing liquid nitrogen with varying initial temperatures in a three-point bending environment. Through examination of the load-displacement curves of the considered coal samples, their mechanical properties are also revealed for different initial temperatures and cycling frequencies. The findings demonstrate a gradual decline in the maximum load capacity of coal rock as the temperature rises. Similarly, when subjected to… More >

  • Open Access

    ARTICLE

    Optimization of a Pipeline-Type Savonius Hydraulic Turbine

    Xiaohui Wang1,2,3,*, Kai Zhang1, Xiaobang Bai4, Senchun Miao1, Zanxiu Wu1, Jicheng Li1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.043272
    Abstract This study focuses on a DN50 pipeline-type Savonius hydraulic turbine. The torque variation of the turbine in a rotation cycle is analyzed theoretically in the framework of the plane potential flow theory. Related numerical simulations show that the change in turbine torque is consistent with the theoretical analysis, with the main power zone and the secondary power zone exhibiting a positive torque. In contrast, the primary resistance zone and the secondary resistance zone are characterized by a negative torque. Analytical relationships between the turbine’s internal flow angle θ, the deflector’s inclination angle α0, and the coverage angle α of the… More >

  • Open Access

    ARTICLE

    Gas-Water Production of a Continental Tight-Sandstone Gas Reservoir under Different Fracturing Conditions

    Yan Liu1, Tianli Sun2, Bencheng Wang1,*, Yan Feng2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.041852
    (This article belongs to this Special Issue: Solid, Fluid, and Thermal Dynamics in the Development of Unconventional Resources )
    Abstract A numerical model of hydraulic fracture propagation is introduced for a representative reservoir (Yuanba continental tight sandstone gas reservoir in Northeast Sichuan). Different parameters are considered, i.e., the interlayer stress difference, the fracturing discharge rate and the fracturing fluid viscosity. The results show that these factors affect the gas and water production by influencing the fracture size. The interlayer stress difference can effectively control the fracture height. The greater the stress difference, the smaller the dimensionless reconstruction volume of the reservoir, while the flowback rate and gas production are lower. A large displacement fracturing construction increases the fracture-forming efficiency and… More >

  • Open Access

    ARTICLE

    A Novel Fracturing Fluid with High-Temperature Resistance for Ultra-Deep Reservoirs

    Lian Liu1,2, Liang Li1,2, Kebo Jiao1,2,*, Junwei Fang1,2, Yun Luo1,2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.030109
    (This article belongs to this Special Issue: Advances in Seepage Mechanism and Numerical Simulation of Unconventional Reservoirs)
    Abstract Ultra-deep reservoirs play an important role at present in fossil energy exploitation. Due to the related high temperature, high pressure, and high formation fracture pressure, however, methods for oil well stimulation do not produce satisfactory results when conventional fracturing fluids with a low pumping rate are used. In response to the above problem, a fracturing fluid with a density of 1.2~1.4 g/cm3 was developed by using Potassium formatted, hydroxypropyl guanidine gum and zirconium crosslinking agents. The fracturing fluid was tested and its ability to maintain a viscosity of 100 mPa.s over more than 60 min was verified under a shear… More >

  • Open Access

    ARTICLE

    Analysis of Calcined Red Mud Properties and Related Mortar Performances

    Zhengfan Lyu1,3, Yulin Li2,3, Mengmeng Fan1,3,*, Yan Huang1, Chenguang Li2
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.043512
    Abstract Red mud (RM) is a low-activity industrial solid waste, and its utilization as a resource is currently a hot topic. In this study, the micro characteristics of red mud at different calcination temperatures were analyzed using X-ray diffraction and scanning electron microscopy. The performance of calcined red mud was determined through mortar strength tests. Results indicate that high-temperature calcination can change the mineral composition and microstructure of red mud, and increase the surface roughness and specific surface area. At the optimal temperature of 700°C, the addition of calcined red mud still leads to a decrease in mortar strength, but its… More >
    Graphic Abstract

    Analysis of Calcined Red Mud Properties and Related Mortar Performances

  • Open Access

    ARTICLE

    A Numerical Study on the Effect of the Backflow Hole Position on the Performances of a Self-Priming Pump

    Dongwei Wang1,*, Lijian Cao1, Weidong Wang2, Jiajun Hu1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.042654
    Abstract A self-priming pump is a centrifugal pump that has the ability to prime itself. Typically, its performance depends on the configuration of its reflux hole. In this study, the ANSYS FLUENT software is used to investigate the effects of three different radial positions of the reflux hole on gas-liquid two-phase distribution, pressure pulsation, and imp during self-priming. The research results indicate that: (1) The effective channel size for the reflux liquid to enter the volute varies depending on the location of the reflux hole. The effect of the impeller rotation on the reflux liquid becomes more obvious as the setting… More >

  • Open Access

    ARTICLE

    Aerodynamic Analysis and Optimization of Pantograph Streamline Fairing for High-Speed Trains

    Xiang Kan1, Yan Li2, Tian Li1,*, Jiye Zhang1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.044050
    Abstract A pantograph serves as a vital device for the collection of electricity in trains. However, its aerodynamic resistance can limit the train’s running speed. As installing fairings around the pantograph is known to effectively reduce the resistance, in this study, different fairing lengths are considered and the related aerodynamic performances of pantograph are assessed. In particular, this is accomplished through numerical simulations based on the k-ω Shear Stress Transport (SST) two-equation turbulence model. The results indicate that the fairing diminishes the direct impact of high-speed airflow on the pantograph, thereby reducing its aerodynamic resistance. However, it also induces interferences in… More >

  • Open Access

    ARTICLE

    Performance Characterization of CR/PU Asphalt for Potential Application in Assembled Fast-Repairing Engineering

    Hong Pang1, Ao Lu1, Ming Xiong1, Chen Chen1, Xian Cao1, Xiong Xu2,3,*, Jing Wang1
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.044000
    Abstract Conventional repairing methods for asphalt pavement have some inconveniences, such as insufficient strength, and are typically time-consuming. To address these issues, this study proposes a new technological method to design and prepare a high-performance assembled asphalt concrete block for fast repair of the potholes. A series of composite modified asphalt binders with 10% crumb rubber (CR) and different dosages (0%, 1%, 3%, 5%) of polyurethane (PU) are examined to determine the optimized binder. Subsequently, the corresponding asphalt mixtures are prepared for further comparison and assessment of engineering properties, such as moistureinduced damage, high-temperature deformation, and low-temperature cracking characteristics. The test… More >

  • Open Access

    ARTICLE

    Smoothed-Particle Hydrodynamics Simulation of Ship Motion and Tank Sloshing under the Effect of Regular Waves

    Mingming Zhao, Jialong Jiao*
    FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2023.043744
    Abstract Predicting the response of liquefied natural gas (LNG) contained in vessels subjected to external waves is extremely important to ensure the safety of the transportation process. In this study, the coupled behavior due to ship motion and liquid tank sloshing has been simulated by the Smoothed-Particle Hydrodynamics (SPH) method. Firstly, the sloshing flow in a rectangular tank was simulated and the related loads were analyzed to verify and validate the accuracy of the present SPH solver. Then, a three-dimensional simplified LNG carrier model, including two prismatic liquid tanks and a wave tank, was introduced. Different conditions were examined corresponding to… More >