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Investigations on High-Speed Flash Boiling Atomization of Fuel Based on numerical simulations

Computer Modeling in Engineering & Sciences 2024年第5期139卷 1427-1453页

作者： Wei Zhong Zhenfang Xin Lihua Wang Haiping Liu School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai200092China Beijing Mechanical Equipment Research Institute Beijing100854China

Flash boiling atomization(FBA)is a promising approach for enhancing spray atomization,which can generate a fine and more evenly distributed spray by increasing the fuel injection temperature or reducing the ambient ***,when the outlet speed of the nozzle exceeds 400 m/s,investigating high-speed flash boiling atomization(HFBA)becomes quite *** difficulty arises fromthe involvement ofmany complex physical processes and the requirement for a very fine mesh in numerical *** this study,an HFBA model for gasoline direct injection(GDI)is *** model incorporates primary and secondary atomization,as well as vaporization and boilingmodels,to describe the development process of the flash boiling *** to lowspeed FBA,these physical processes significantly impact *** this model,the Eulerian description is utilized for modeling the gas,and the Lagrangian description is applied to model the droplets,which effectively captures the movement of the droplets and avoids excessive mesh in the Eulerian *** various conditions,numerical solutions of the Sauter mean diameter(SMD)for GDI show good agreement with experimental data,validating the proposed model’s *** based on this HFBA model investigate the influences of fuel injection temperature and ambient pressure on the atomization *** analyses of the velocity field,temperature field,vapor mass fraction distribution,particle size distribution,and spray penetration length under different superheat degrees reveal that high injection temperature or low ambient pressure significantly affects the formation of small and dispersed droplet *** effect is conducive to the refinement of spray particles and enhances atomization.

关键词： High-speed flash boiling atomization numerical simulations Eulerian description Lagrangian description gasoline direct injection

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numerical simulations of One-Directional Fractional Pharmacokinetics Model

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Computers, Materials & Continua 2022年第12期73卷 4923-4934页

作者： Nursyazwani Mohamad Noor Siti Ainor Mohd Yatim Nur Intan Raihana Ruhaiyem School of Distance Education Universiti Sains MalaysiaUSM PenangPenang11800Malaysia School of Computer Science Universiti Sains MalaysiaUSM PenangPenang11800Malaysia

In this paper,we present a three-compartment of pharmacokinetics model with irreversible rate *** compartment consists of arterial blood,tissues and venous ***’s principle and the law of mass action were used to develop the model based on the diffusion *** model is modified into a fractional pharmacokinetics model with the sense of Caputo *** existence and uniqueness of the model are investigated and the positivity of the model is *** behaviour of the model is investigated by implementing numerical algorithms for the numerical solution of the system of fractional differential *** software is used to plot the graphs for illustrating the variation of drug concentration concerning ***,the numerical simulations of the model are presented for different values ofαwhich verified the theoretical ***,we also observed the pattern of the simulations at the three-compartment of the model by using different values of initial conditions.

关键词： Pharmacokinetics model Irreversible rate Fractional order numerical simulations

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numerical simulations AND DOPPLER RADAR DATA ANALYSIS OF A HAIL PROCESS IN HUAIHE RIVER BASIN

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Acta meteorologica Sinica 2002年第3期16卷 388-400,404页

作者：李柏许小峰周昆 Nanjing Institute of Meteorology Nanjing 210044 China Meteorological Administration Beijing 100081 Meteorological Observatory of Anhui Province Hefei 230061

A hail process in Huaihe River Basin observed by CINRAD Doppler radar on 12May 2000 has been simulated by using nonhydrostatic mesoscale numerical model *** simulated wind field is analyzed and compared with Doppler radar wind data,both of them show that there was a meso-β cyclone around the hail *** show that this meso-β cyclone existed below 3 km in the troposphere and its cyclonic circulation was very obvious below 1 *** temperature and moisture fields from the simulation are also ***,the storm-relative environmental helicity and CAPE(convective available potential energy)are discussed.

关键词： hail process numerical simulations radar observation meso-β cyclone

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Urban flood inundation and damage assessment based on numerical simulations of design rainstorms with different characteristics

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Science China(Technological Sciences) 2020年第11期63卷 2292-2304页

作者： MEI Chao LIU JiaHong WANG Hao LI ZeJin YANG ZhiYong SHAO WeiWei DING XiangYi WENG BaiSha YU YingDong YAN DianYi State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China Engineering and Technology Research Center for Water Resources and Hydroecology of the Ministry of Water Resources Beijing 100044China

In the context of global climate change and urbanization,urban flooding is an important type of natural disaster that affects urban development,especially in China,which is experiencing rapid *** the past 10 years,urban flooding events have caused huge disaster losses in Chinese *** has resulted in significant negative effects on the urban infrastructure,socioeconomic systems,and urban residents,thus causing widespread *** have confirmed the change in extreme rainstorms is due to the changing environments in many cities *** studies on the impact of these rainstorms with different characteristics for urban flooding is valuable for coping with unfavorable *** addition,numerical simulations provide an economical and viable means to perform these *** paper presents a numerical model of Xiamen Island in *** were conducted for 12 design rainstorm events with different return periods,rain patterns,and *** results indicate that,in the case of an equal rainfall amount,the rainfall intensity is the key factor that affects the inundated area,depth,and ***,the rainfall intensity is not the only determining factor;the rainfall pattern also affects the *** regard to the rainfall pattern,a higher rainfall peak coefficient usually leads to severe urban inundation and *** a result,the lag time would be shorter,which may further exacerbate the impact of urban flood *** results of this study provide insights into managing flood risks,developing urban flood prevention strategies,and designing flood prevention measures.

关键词： urban flood flood damage assessment flood disaster management numerical simulations design rainstorms

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Vertical impedance functions of pile groups under low-to-high loading amplitudes:numerical simulations and experimental validation

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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 647-666页

作者： Usama Zafar Chandra Shekhar Goit Masato Saitoh Riku Fukuda School of Science and Engineering Saitama University255 Shimo-OkuboSaitamaJapan

Piles in a group experience additional displacements in soil due to pile-to-pile interactions apart from those resulting from the external *** effect of these interactions determined assuming soil as an elastic and/or viscoelastic material on pile head impedance functions of the pile group is studied by relating the group stiffness to the static stiffness of a single ***,the prevailing elastic solutions may misestimate the resulting pile group response due to the lack of consideration for either soil(material)and/or soil-pile interface *** is well established that soil behaves nonlinearly under moderate-to-high loading amplitudes,and besides,the soil-pile interface nonlinearity can exist even at small loading *** study addresses the effects of these nonlinearities on the vertical impedance functions of a 3×3-pile group using numerical methods by direct analyses and superposition using pile-to-pile interaction *** numerical results are validated using scaled model tests under 1 g *** results highlight the overestimation of pile-to-pile interactions in the pile group when assuming elastic soil *** cases either by direct analyses or superposition approach involving soil and soil-pile interface nonlinearities agree well with the experimental pile group responses under close-to-elastic and nonlinear conditions.

关键词： impedance functions numerical simulations model-scale experiment superposition approach soil-pile interface nonlinearity

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Image Representations of numerical simulations for Training Neural Networks

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Computer Modeling in Engineering & Sciences 2023年第2期134卷 821-833页

作者： Yiming Zhang Zhiran Gao Xueya Wang Qi Liu School of Civil and Transportation Engineering Hebei University of TechnologyTianjin300401China School of Computer and Software Nanjing University of Information Science&TechnologyNanjing210044China

A large amount of data can partly assure good fitting quality for the trained neural *** the quantity of experimental or on-site monitoring data is commonly insufficient and the quality is difficult to control in engineering practice,numerical simulations can provide a large amount of controlled high quality *** the neural networks are trained by such data,they can be used for predicting the properties/responses of the engineering objects instantly,saving the further computing efforts of simulation ***,a strategy for efficiently transferring the input and output data used and obtained in numerical simulations to neural networks is desirable for engineers and *** this work,we proposed a simple image representation strategy of numerical simulations,where the input and output data are all represented by *** temporal and spatial information is kept and the data are greatly *** addition,the results are readable for not only computers but also human *** examples are given,indicating the effectiveness of the proposed strategy.

关键词： numerical simulations neural network pre-/post-processing data compression

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STRESS-STRAIN HYSTERESIS OF Cu-Zn-Al POLYCRYSTALLINE SMAs─Ⅱ: EXPERIMENTS AND numerical simulations

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Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 211-215页

作者： Y. Chen Y. Huo X. Zu M. Tu and Y. Gou ( Department of Metal Materials, Sichuan University, Chengdu 610065, China)( Department of Metal Materials, Sichuan University, Chengdu 610065, China)( Department of Metal Materials, Sichuan University, Chengdu 610 Sichuan Univ Chengdu China

In this paper, the stress-strain bys torests at various temperatures was investigated experimentally for Cu-Zn-Al polycrystalline shape memory alloys (SMAs). numerical simulations of the pseudoelastic hysteresis were performed based on a model, which had been proposed by the authors. As observed in the experiments, the shapes of the outer loops of the hysteresis varied strongly from specimen to specimen, which have the same chemical composition but different heat-treatment. Rather complicated inner hysteretic curves were obtained at testing temperatures higher than Af. The numerical simulations of the stress-strain hysteresis and the inner hysteretic curves agreed quite well with the experimental results.

关键词： shape memory alloys (SMAs) hystcresls inner hysteretic Beavior pseudoelasticity numerical simulations

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numerical simulations of kinetic formation mechanism of Tangjiashan landslide

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Journal of Rock Mechanics and Geotechnical Engineering 2012年第2期4卷 149-159页

作者： Gang Luo Xiewen Hu Chengzhuang Gu Ying Wang Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu610031China Aseismic Engineering Technology Key Laboratory of Sichuan Province Southwest Jiaotong UniversityChengdu610031China

Tangjiashan landslide is a typical high-speed landslide hosted on consequent bedding rock. The landslide was induced by Wenchuan earthquake at a medium-steep hill slope. The occurrence of Tangjiashan landslide was basically controlled by the tectonic structure, topography, stratum lithology, slope structure, seismic waves, and strike of river. Among various factors, the seismic loading with great intensity and long duration was dominant. The landslide initiation exhibited the local amplification effect of seismic waves at the rear of the slope, the dislocation effect on the fault, and the shear failure differentiating effect on the regions between the soft and the hard layers. Based on field investigations and with the employment of the distinct element numerical simulation program UDEC （universal distinct element code）, the whole kinetic sliding process of Tan iashan landslide was represented and the formation mechanism of the consequent rock landslide under seismic loading was studied. The results are helpful for understanding seismic dynamic responses of consequent bedding rock slopes, where the slope stability could be governed by earthquakes.

关键词： Tangjiashan high-speed landslide formation mechahism sliding process numerical simulations

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numerical simulations OF β-GYRES IN TROPICAL CYCLONES

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Journal of Tropical Meteorology 2003年第1期9卷 86-94页

作者：杨洪波张铭 Meteorological Institute China PLA University of Science & Technology

The circulation of β-gyres in tropical cyclones is studied using numerical simulations. As shown in the result, there is clear circulation of β-gyres in the deviation flow field of the middle layer of the model,i.e. there is cyclone current west of the vortex center but anticyclone current east of it. The theory analysis shows that the circulation of β-gyres is formed by the advection of geostrophic vorticity.

关键词： tropical cyclones β-gyres numerical simulations

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EFFECTS OF PACIFIC SSTA ON SUMMER PRECIPITATION OVER EASTERN CHINA, PART II: numerical simulations

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Journal of Tropical Meteorology 2007年第2期13卷 113-119页

作者：余贞寿孙照渤倪东鸿曾刚 Wenzhou Meteorological Bureau Jiangsu Key Laboratory of MeteorologicalDisaster NUIST Nanjing 210044 China Jiangsu Key Laboratory of MeteorologicalDisaster NUIST

Based on an observational analysis, seven numerical experiments are designed to study the impacts of Pacific SSTA on summer precipitation over eastern China and relevant physical mechanism by NCAR CCM3. The numerical simulation results show that preceding winter SSTA in the Kuroshio region leads to summer precipitation anomaly over the Yangtze River valleys by modifying atmospheric general circulation over eastern Asia and middle-high latitude. West Pacific subtropical high is notably affected by preceding spring SSTA over the middle and east of Equator Pacific; SSTA of the central region of middle latitude in the corresponding period causes the summer rainfall anomaly over eastern China so as to trigger the atmospheric Eurasia-Pacific teleconnection pattern.

关键词： Pacific SSTA eastern China summer precipitation numerical simulations

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