Open Access
ARTICLE
Yan Xiong1, Xiangnan Song1, Jiawei Lu1, Lei Liu2, Yaru Yan3, Xuemin Ye3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.063769
Abstract Enhancing the fermentation efficiency of waste in waste warehouses is pivotal for accelerating the pyrolysis process and minimizing harmful gas emissions. This study proposes an integrated approach, combining hot air injection with dual atomizing nozzles, for the thermal treatment of waste piles. Numerical simulations are employed to investigate the influence of various parameters, namely, nozzle height, nozzle tilt angle, inlet air velocity and air temperature, on the droplet diffusion process, spread area, droplet temperature, and droplet size distribution. The results show that reducing the nozzle height increases the temperature of droplets upon their deposition on… More >
Graphic Abstract
Open Access
ARTICLE
Anna Chiara Uggenti1, Giorgio Rech2, Raffaella Gerboni2,*, Gianmario Ledda2, Amedeo Aliberti1, Claudia Vivalda3, Emanuela Bruno2, Andrea Carpignano2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.062347
（This article belongs to the Special Issue: Recent Advances in Computational Fluid Dynamics)
Abstract The paper presents an innovative approach to studying the reuse of a decommissioned natural gas production platform for the seasonal storage and extraction of a hydrogen-methane (H2-CH4) mixture from a depleted reservoir. The reuse plan involves removing outdated equipment from the platform’s decks while retaining essential components such as wellheads and separators. Exploiting a depleted reservoir for the injection of an H2-CH4 mixture requires a thorough understanding of its specific characteristics. This paper focuses on the engineering approach adopted in the basic design phase for such a conversion, providing recommendations and HSE guidelines. Given the hazardous… More >
Open Access
ARTICLE
Yuyao Li1, Mingmin He1, Mingjie Cai1, Shiqian Xu2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.062862
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract In ultra-deep and large well sections, high collapse stresses and diminished annular return velocity present significant challenges to wellbore cleaning. With increasing depth, rising temperature and pressure constrain the regulation of displacement and drilling fluid rheology, impairing the fluid’s capacity to transport cuttings effectively. A precise understanding of cuttings settlement behavior and terminal velocity is therefore essential for optimizing their removal. This study accounts for variations in wellbore temperature and pressure, incorporates non-spherical cuttings and wellbore diameter parameters, and develops accordingly a simplified model to predict terminal settlement velocity. The cuttings carrying ratio is introduced… More >
Graphic Abstract
Open Access
ARTICLE
Xiaozong Song*, Jiangbin Liu, Longhua Fei, Wencong Zhang
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061222
Abstract Ultra-precision components have been widely used to produce advanced optoelectronic equipment. The so-called Electric field enhanced UltraViolet-Induced Jet Machining (EUV-INCJM) is an ultra-precision method that can achieve sub-nanometer level surface quality polishing. This study focuses on the application of the EUV-INCJM with different nozzle structures to a single-crystal of silicon. Two kinds of electro-optic-liquid coupling nozzles with single-jet and multi-jet focusing structures are proposed accordingly. Simulations and experiments have been conducted to verify the material removal performance of these nozzles. The simulation results show that, under the same condition, the flow velocity of the single-jet… More >
Open Access
ARTICLE
Tatyana Lyubimova1,*, Anatoly Lepikhin2, Yanina Parshakova1, Andrey Bogomolov2, Alibek Issakhov3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061649
（This article belongs to the Special Issue: Non-Equilibrium Processes in Continuous Media)
Abstract The article presents the results of in-kind measurements and numerical modeling of the formation of water characteristics in the Kama River, which is used for technical water supply in the production of potash fertilizers. In the warm season, risks arise that threaten the sustainability of the water supply. It was found that in the summer, when the studied section of the Kama River is backed up by the Kama Hydroelectric Power Station, there is a significant decrease in flow rates, which leads to vertical stratification of water properties. This, in turn, significantly limits the possibilities… More >
Open Access
ARTICLE
Manqing Qian*, Xiyu Chen, Yongming Li
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061652
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract Shale reservoirs are characterized by numerous geological discontinuities, such as bedding planes, and exhibit pronounced heterogeneity across rock layers separated by these planes. Bedding planes often possess distinct mechanical properties compared to the surrounding rock matrix, particularly in terms of damage and fracture behavior. Consequently, vertical propagation of hydraulic fractures is influenced by both bedding planes and the heterogeneity. In this study, a numerical investigation into the height growth of hydraulic fractures was conducted using the finite element method, incorporating zero-thickness cohesive elements. The analysis explored the effects of bedding planes, toughness contrasts between layers,… More >
Open Access
REVIEW
Md. Mahbub Alam
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.060942
Abstract Wind turbines play a vital role in renewable energy production. This review examines advancements in
wind turbine blade morphing technologies aimed at enhancing power coefficients, reducing vibrations, and minimizing
noise generation. Efficiency, vibration, and noise levels can be optimized through morphing techniques applied to the
blade’s shape, leading edge, trailing edge, and surface. Leading-edge morphing is particularly effective in improving
efficiency and reducing noise, as flow attachment and separation at the leading edge significantly influence lift and
vortex generation. Morphing technologies often draw inspiration from bionic designs based on natural phenomena,
highlighting the potential of More >
Open Access
ARTICLE
Shanshan Tang1,2,*, Zhanbin Li3,4, Xubin Zhu1,2, Peng Li3, Zhaoyang Feng1,2, Guoliang Yang1,2, Huake Chang1,2, Zefeng Che1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.057605
Abstract The particle size distribution plays a crucial role in the transportation and deposition of eroded sediments. Gaining insights into the related sorting mechanism can significantly enhance our understanding of such processes. In this study, sand-covered slopes were examined. A controlled indoor rainfall simulation was conducted on loess slopes with a 12° incline and a rainfall intensity of 1.5 mm/min. These slopes were then covered with sand layers of varying thicknesses—0.5, 1.0, and 1.5 cm—to observe their effects. The findings have revealed that as the thickness of the sand cover increases, the content of sediment particles… More >
Open Access
REVIEW
Dapeng Zhang*, Yifan Xie, Yining Zhang, Zhengjie Liang, Yutao Tian
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061829
Abstract Airfoil structures play a crucial role across numerous scientific and technological disciplines, with the transition to turbulence and stall onset remaining key challenges in aerodynamic research. While experimental techniques often surpass numerical simulations in accuracy, they still present notable limitations. This paper begins by elucidating the fundamental principles of transition, dynamic stall, and airfoil behavior. It then provides a systematic review of six major experimental methodologies and examines the emerging role of artificial intelligence in this domain. By identifying key challenges and limitations, the study proposes strategic advancements to address these issues, offering a foundational More >
Open Access
ARTICLE
Li-Li Wang*, Hong-Xing Qin, Nan Dong
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061154
（This article belongs to the Special Issue: Computational Mechanics and Fluid Dynamics in Intelligent Manufacturing and Material Processing Ⅱ)
Abstract The so-called close-coupled gas atomization process involves melting a metal and using a high-pressure gas jet positioned close to the melt stream to rapidly break it into fine, spherical powder particles. This technique, adapted for blast furnace slag granulation using a circular seam nozzle, typically aims to produce solid slag particles sized 30–140 µm, thereby allowing the utilization of slag as a resource. This study explores the atomization dynamics of liquid blast furnace slag, focusing on the effects of atomization pressure. Primary atomization is simulated using a combination of the Volume of Fluid (VOF) method… More >
Open Access
ARTICLE
Baoyu Chen1,2, Meina Li3, Jicheng Zhang1, Wenguo Ma1,*, Yueqi Wang1, Tianchen Pan1, Xuan Liu1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.060255
Abstract The relative permeability of oil and water is a key factor in assessing the production performance of a reservoir. This study analyzed the impact of injecting a viscosity reducer solution into low-viscosity crude oil to enhance fluid flow within a low-permeability reservoir. At 72°C, the oil-water dispersion solution achieved a viscosity reduction rate (f) of 92.42%, formulated with a viscosity reducer agent concentration (CVR) of 0.1% and an oil-water ratio of 5:5. The interfacial tension between the viscosity reducer solution and the crude oil remained stable at approximately 1.0 mN/m across different concentrations, with the minimum More >
Open Access
ARTICLE
Li Niu1, Yang Wang1,*, Nan Lin2, Yaoying Yue1, Wenbin Fu1, Elzat Tuhanjiang1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.062623
（This article belongs to the Special Issue: Computational Mechanics and Fluid Dynamics in Intelligent Manufacturing and Material Processing Ⅱ)
Abstract With the widespread use of polyethylene (PE) materials in gas pipelines, the problem related to the aging of these pipes has attracted increasing attention. Especially under complex environmental conditions involving temperature, humidity, and pressure changes, PE pipes are prone to oxidative degradation, which adversely affects their performance and service life. This study investigates the aging behavior of PE pipes used for gas transport under the combined effects of temperature (ranging from 80°C to 110°C) and pressure (0, 0.1, 0.2, and 0.3 MPa). By assessing the characteristics and thermal stability of the aged pipes, relevant efforts… More >
Open Access
ARTICLE
Yongsheng Wang1,2, Xiangwu Lu1, Wei Yuan1,*, Lei Zhang1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061052
Abstract This study explores the influence of rotor blade angle on stall inception in an axial fan by means of numerical simulations grounded in the Reynolds-Averaged Navier-Stokes (RANS) equations and the Realizable k-ε turbulence model. By analyzing the temporal behavior of the outlet static pressure, along with the propagation velocity of stall inception, the research identifies distinct patterns in the development of stall. The results reveal that stall inception originates in the second rotor impeller. At a blade angle of 27°, the stall inception follows a modal wave pattern, while in all other cases, it assumes the More >
Open Access
ARTICLE
Fengxia Shi1,2, Pengcheng Wang1,*, Haonan Zhan1, Xiangyun Shi1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.062244
Abstract To investigate the impact of guide vane geometry—specifically, outlet angle, blade count, and radial height—on the performance of a Pump as Turbine (PAT), radial guide vanes were introduced upstream of the impeller in an IS80-50-315 low-specific-speed centrifugal PAT. Using an orthogonal test design, numerical simulations were conducted on 16 different PAT configurations, and the influence of vane geometry on performance was analyzed through a range analysis to determine the optimal parameter combinations. The results indicate that the number of guide vane blades significantly affects both the hydraulic efficiency and water head of the PAT under More >
Open Access
ARTICLE
Denis Polezhaev*, Alexey Vjatkin, Victor Kozlov
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.062000
（This article belongs to the Special Issue: Non-Equilibrium Processes in Continuous Media)
Abstract The dynamics of fluid and non-buoyant particles in a librating horizontal annulus is studied experimentally. In the absence of librations, the granular material forms a cylindrical layer near the outer boundary of the annulus and undergoes rigid-body rotation with the fluid and the annulus. It is demonstrated that the librational liquefaction of the granular material results in pattern formation. This self-organization process stems from the excitation of inertial modes induced by the oscillatory motion of liquefied granular material under the influence of the gravitational force. The inertial wave induces vortical fluid flow which entrains particles More >
Open Access
ARTICLE
Qi Deng1, Qi Ruan2, Bo Zeng1, Qiang Liu3, Yi Song1, Shen Cheng1, Huiying Tang2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.060311
Abstract Over more than a decade of development, medium to deep shale gas reservoirs have faced rapid production declines, making sustained output challenging. To harness remaining reserves effectively, advanced fracturing techniques such as infill drilling are essential. This study develops a complex fracture network model for dual horizontal wells and a four-dimensional in-situ stress evolution model, grounded in elastic porous media theory. These models simulate and analyze the evolution of formation pore pressure and in-situ stress during production. The investigation focuses on the influence of infill well fracturing timing on fracture propagation patterns, individual well productivity, and… More >
Open Access
ARTICLE
Tao Wang1,2, Haiyang Yu1,*, Jie Gao2, Fei Wang2, Xinlong Zhang3,*, Hao Yang2, Guirong Di2, Pengrun Wang2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.058865
Abstract Oilfields worldwide are increasingly grappling with challenges such as early water breakthrough and high water production, yet direct, targeted solutions remain elusive. In recent years, chemical flooding techniques designed for tertiary oil recovery have garnered significant attention, with microgel flooding emerging as a particularly prominent area of research. Despite its promise, the complex mechanisms underlying microgel flooding have been rarely investigated numerically. This study aims to address these gaps by characterizing the distribution of microgel concentration and viscosity within different pore structures. To enhance the accuracy of these characterizations, the viscosity of microgels is adjusted More >
Open Access
ARTICLE
Alexey Vjatkin*, Svyatoslav Petukhov, Victor Kozlov
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.062535
（This article belongs to the Special Issue: Non-Equilibrium Processes in Continuous Media)
Abstract Time-averaged thermal convection in a rotating horizontal annulus with a higher temperature at its inner boundary is studied. The centrifugal force plays a stabilizing role, while thermal convection is determined by the “thermovibrational mechanism”. Convective flow is excited due to oscillations of a non-isothermal rotating fluid. Thermal vibrational convection manifests in the form of two-dimensional vortices elongated along the axis of rotation, which develop in a threshold manner with an increase in the amplitude of fluid oscillations. The objective of the present study is to clarify the nature of another phenomenon, i.e., three-dimensional convective vortices… More >
Open Access
ARTICLE
Zhi Yang1,2, Xiaohui Zhang1,2,*, Xinting Tong3, Yutang Zhao4, Teng Xia1,2, Hua Wang1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.061737
Abstract In bottom-blown copper smelting processes, oxygen-enriched air is typically injected into the melt through a lance, generating bubbles that ascend and agitate the melt, enhancing mass, momentum, and heat transfer within the furnace. The melt’s viscosity, which varies across reaction stages, and the operating conditions influence bubble size and dynamics. This study investigates the interplay between melt viscosity and bubble diameter on bubble motion using numerical simulations and experiments. In particular, the volume of fluid (VOF) method and Ω-identification technique were employed to analyze bubble velocity, deformation, trajectories, and wake characteristics. The results showed that More >
Open Access
ARTICLE
Yangyang Cao, Jiye Zhang*, Jiawei Shi, Yao Zhang
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.060429
（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 pantograph area is a critical source of aerodynamic noise in high-speed trains, generating noise both directly and through its cavity, a factor that warrants considerable attention. One effective method for reducing aerodynamic noise within the pantograph cavity involves the introduction of a jet at the leading edge of the cavity. This study investigates the mechanisms driving cavity aerodynamic noise under varying jet velocities, using Improved Delayed Detached Eddy Simulation (IDDES) and Ffowcs Williams-Hawkings (FW-H) equations. The numerical simulations reveal that an increase in jet velocity results in a higher elevation of the shear layer… More >
Open Access
ARTICLE
Yu Zhang1, Shang-Zhen Yu2, Jia-Jia Yu2,3,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.057804
Abstract
RP-3 is a kind of aviation kerosene commonly used in hypersonic and scramjet engines due to its superior thermal stability, high energy density, and ability to act as a coolant before combustion. However, it is known that coke can be generated during the cooling process as a carbonaceous deposition on metal walls and its effects on the cooling performance are still largely unknown. To explore the influence mechanism of porous coke on heat transfer characteristics of supercritical RP-3 in the regenerative cooling channel, a series of computational simulations were conducted via a three-dimensional CFD… More >
Open Access
ARTICLE
Shiyao Peng1, Hanwen Zhang1, Chong Chai1, Shilong Xue2, Xiaobin Zhang2,*
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.060452
Abstract The diffusion of hydrogen-blended natural gas (HBNG) from buried pipelines in the event of a leak is typically influenced by soil properties, including porosity, particle size, temperature distribution, relative humidity, and the depth of the pipeline. This study models the soil as an isotropic porous medium and employs a CFD-based numerical framework to simulate gas propagation, accounting for the coupled effects of soil temperature and humidity. The model is rigorously validated against experimental data on natural gas diffusion in soil. It is then used to explore the impact of relevant parameters on the diffusion behavior… More >
Open Access
ARTICLE
Li Wang1, Haipeng Mu1, Jiming Zhu2,*, Zhongchang Wang3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.057931
Abstract
To elucidate the relationship between pipeline erosion and wear during slurry transportation, this study considers three key influencing parameters, namely, the ratio of inlet to outlet pipe diameter, the length of the variable diameter section, and the roughness of the pipe wall. The impact of these factors on pipeline erosion and wear is analyzed using a single-factor analysis approach. In particular, the Fluent software is employed to conduct the required numerical simulations for variable diameter elbows of varying morphologies. The results indicate that as the inlet to outlet diameter ratio increases, the wear on… More >
Open Access
ARTICLE
Shuxun Li1,2, Jianwei Wang1,2,*, Tingjin Ma1, Guolong Deng1,2, Wei Li1,2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.059570
Abstract
In photothermal power (solar energy) generation systems, purging residual molten salt from pipelines using high-pressure gas poses a significant challenge, particularly in clearing the bottom of regulating valves. Ineffective purging can lead to crystallization of the molten salt, resulting in blockages. To address this issue, understanding the gas-liquid two-phase flow dynamics during high-pressure gas purging is crucial. This study utilizes the Volume of Fluid (VOF) model and adaptive dynamic grids to simulate the gas-liquid two-phase flow during the purging process in a DN50 PN50 conventional molten salt regulating valve. Initially, the reliability of the… More >
Open Access
ARTICLE
Anqi Du1,*, Ming Wen2, Jian Yang1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.058553
（This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources II)
Abstract Horizontal wells play a crucial role in enhancing shale gas reservoir production. This study employs transient multiphase simulation to investigate the impact of well trajectory on production optimization throughout a well’s life cycle. The research uses OLGATM as a simulator to examine six well trajectories: toe-up, toe-down, smooth horizontal, undulated toe-up, undulated toe-down, and undulated horizontal. Initial findings indicate comparable production rates across different trajectories during the early production phase, with toe-up wells showing slightly better performances due to minimal slugging. However, as the reservoir pressure decreases, the well trajectory significantly influences production. Horizontal wells achieve More >
Open Access
ARTICLE
Liang Ai1, Mingyue Li2, Lumin Chen1, Yihua Gao2, Yi Sun1, Yue Wu1, Fuping Qian1,*, Jinli Lu2, Naijin Huang3
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2025.055985
Abstract
In this study, Computational Fluid Dynamics (CFD) together with a component transport model are exploited to investigate the influence of dimensionless parameters, involving the height of the rectifier grid and the installation height of the first catalyst layer, on the flow field and the overall denitration efficiency of a cement kiln’s SCR (Selective catalytic reduction) denitrification reactor. It is shown that accurate numerical results can be obtained by fitting the particle size distribution function to the actual cement kiln fly ash and implementing a non-uniform particle inlet boundary condition. The relative error between denitration More >
Open Access
ARTICLE
Yuliang Zhang1,2,*, Zezhou Yang1, Lianghuai Tong3,*, Yanjuan Zhao4, Xiaoqi Jia5, Anda Han6
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.059903
Abstract
This paper investigates the start-up and shutdown phases of a five-bladed closed-impeller centrifugal pump through experimental analysis, capturing the temporal evolution of its hydraulic performances. The study also predicts the transient characteristics of the pump under non-rated operating conditions to assess the accuracy of various machine learning methods in forecasting its instantaneous performance. Results indicate that the pump’s transient behavior in power-frequency mode markedly differs from that in frequency-conversion mode. Specifically, the power-frequency mode achieves steady-state values faster and exhibits smaller fluctuations before stabilization compared to the other mode. During the start-up phase, as… More >
Open Access
ARTICLE
Dongwei Wang1,*, Wensheng Ma2, Weiguo Zhao1, Rui Cao2, Youchao Yang2
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.055220
Abstract Cavitation is an unavoidable phenomenon in the operation of centrifugal pumps. Prolonged cavitation can cause significant damage to the components of the flow channel, and in severe cases, it may even interfere with the normal energy exchange processes within the pump. Therefore, effective monitoring of cavitation in centrifugal pumps is crucial. This article presents a study that approaches the issue from an acoustic perspective, using experimental methods to gather and analyze acoustic data at the inlet and outlet of centrifugal pumps across various flow rates, with hydrophones as the primary measuring instruments. Results show that… More >
Open Access
ARTICLE
Zhuang Liu1,*, Tingen Fan1, Qianli Lu2, Jianchun Guo2, Renfeng Yang1, Haifeng Wang1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.056729
Abstract
Thermal shock damage in deep shale hydraulic fracturing can impact fracture propagation behaviors, potentially leading to the formation of complex fractures and enhancing gas recovery. This study introduces a thermal-hydraulic-mechnical (THM) coupled fracture propagation model relying on the phase field method to simulate thermal shock-induced fracturing in the deep shale considering dynamic temperature conditions. The validity of this model is confirmed through comparison of experimental and numerical results concerning the THM-coupled stress field and thermal cracking. Special attention is paid to the interaction of thermal shock-induced fractures in deep shale that contains weak planes. More >
Open Access
ARTICLE
Wei Dong1,2,3,4, Fuping Qian5,*, Gang Li1,*, Shi’an Zhou5, Lei Ding2,4, Qingda Gao5, Xuemin Zeng1
FDMP-Fluid Dynamics & Materials Processing, DOI:10.32604/fdmp.2024.056060
Abstract Nitrogen oxides (NOx) and particulate matter (PM) present significant risks to both human health and environmental sustainability. The Integrated Dust Removal and Denitrification Technology (DRDt) offers a more efficient and cost-effective solution for achieving ultralow industrial flue gas emissions; however, its effectiveness is undermined by low catalyst load rates and poor stability in filter materials. This study addresses these limitations by modifying conventional PTFE filter media (PTFE-Tim) through the incorporation of sodium alginate (SA) and dopamine (DA) as modifiers, resulting in two new filter materials: PTFE–SA–MOF and PTFE–DA–MOF. By optimizing the parameters of an orthogonal experimental… More >
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