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| 1 | Human, Social, and Now Positive Psychological Capital Management:显示文摘 | FRED LUTHANS CAROLYN M. YOUSSEF | 2004 | Organizational Dynamics2004，，2： | 8 |
| 2 | Industrial structure and aggregate growth显示文摘 | Michael Peneder | 2002 | Structural Change and Economic Dynamics2002，，4： | 6 |
| 3 | A Numerical Study of the Aerodynamic Characteristics of a High-Speed Train under the Effect of Crosswind and Rain显示文摘The performances of high-speed trains in the presence of coupling effects with crosswind and rain have attracted great attention in recent years.The objective of the present paper was to investigate the aerodynamic characteristics of a high-speed train under such conditions in the framework of an Eulerian-Lagrangian approach.An aerodynamic model of a high-speed train was first set up,and the side force coefficient obtained from numerical simulation was compared with that provided by wind tunnel experiments to verify the accuracy of the approach.Then,the effects of the yaw angle,the resultant wind speed,and the rainfall rate on aerodynamic coefficients were analyzed.The results indicate that the aerodynamic coefficients grow almost linearly with the rainfall rate,and increase with a decrease in the resultant wind speed.Due to the impact of raindrops on the train surface and the airflow,the pressure coefficients of windward and leeward side of the train become larger with the increase of the rainfall rate.Raindrops can accelerate the airflow and suppress the vortices detachment.Moreover,the flow velocity in regions surrounding the train increases with an increase in the rainfall rate. | Haiqing Li Mengge Yu Qian Zhang Heng Wen | 2020 | Fluid Dynamics & Materials Processing2020，16，1： | 6 |
| 4 | An Analysis of the Stretching Mechanism of a Liquid Bridge in Typical Problems of Dip-Pen Nanolithography By Using Computational Fluid Dynamics显示文摘A computational study of the stretching mechanism of a liquid bridge and the effect of the liquid properties on the DPN(dip-pen nanolithography)process is presented.The results show that the viscosity and contact angle can have an appreciable influence on these processes.The greater the viscosity,the harder the liquid bridge is to break,which allows more molecular transfer during the DPN spotting process.Besides,when the contact angle between the liquid and substrate is less than 60 degrees,the time required to stretch the bridge and break it grows with the contact angle.During the stretching process,the pressure in the midsection(along the vertical direction)of the liquid bridge is relatively unstable,with frequent changes in its value.Furthermore,this pressure increases sharply when the liquid bridge breaks. | Cheng Zhang Mingge Wu | 2019 | Fluid Dynamics & Materials Processing2019，15，4： | 5 |
| 5 | Policy distortions and aggregate productivity with heterogeneous establishments显示文摘 | Diego Restuccia Richard Rogerson | 2008 | Review of Economic Dynamics2008，，4： | 5 |
| 6 | Numerical Study on Aerodynamic Performance of High-Speed Pantograph with Double Strips显示文摘Pantograph is a critical component of the high-speed train.It collects power through contact with catenary,which significantly affects the running safety of the train.Pantograph with double collector strips is one common type.The aerodynamic performance of the collector strips may affect the current collection of the pantograph.In this study,the aerodynamic performance of the pantograph with double strips is investigated.The numerical results are consistent with the experimental ones.The error in the aerodynamic drag force of the pantograph between numerical and experimental results is less than 5%.Three different conditions of the strips are studied,including the front strip,the rear strip,and the double strips.Results show that the presence of the front strip will affect the lift force of the rear strip,and reduce the resistance of the rear strip under the opening condition.Meanwhile,the rear strip has few effects on the front strip under the opening operation condition.The law of the resistance for the interaction between two strips under the closing condition is similar to the opening one. | Zhiyuan Dai Tian Li Weihua Zhang Jiye Zhang | 2020 | Fluid Dynamics & Materials Processing2020，16，1： | 5 |
| 7 | Effect of Streamlined Nose Length on the Aerodynamic Performance of a 800 km/h Evacuated Tube Train显示文摘The aerodynamic resistance of a train running in the open air limits the maximum speed that can be attained by the train.For this reason,evacuated tube trains(ETT)are being considered as valid alternatives to be implemented in the future.The atmosphere in the tube,the so-called blocking ratio and the length of the streamlined nose are the key factors affecting the aerodynamic performances of these trains.In the present work,we investigate evacuated tube trains with different lengths of the streamline nose on the basis of computational fluid dynamics(CFD).The three-dimensional steady compressible Navier-Stokes equations are solved.The running speed of the ETT is 800 km/h and the blocking ratio is 0.2.Results show that with the increase of the streamlined nose length,the aerodynamic drag and lift forces of the head car decrease gradually,and the drag and lift forces of the middle car change slightly.For the tail car,the drag force decreases,whereas the absolute value of the lift force increases.At a speed of 800 km/h,a slight shock wave appears at the rear of the tail car,which affects the aerodynamic forces acting on the train. | Xiaohan Zhang Yao Jiang Tian Li | 2020 | Fluid Dynamics & Materials Processing2020，16，1： | 5 |
| 8 | Study on Energy Conversion Characteristics in Volute of Pump as Turbine显示文摘A volute is a curved funnel with cross-sectional area increasing towards the discharge port.The volute of a centrifugal pump is the casing hosting the fluid being pumped by the impeller.In Pump-as-turbine devices(PAT),vice versa the volute plays the role of energy conversion element.In the present analysis,this process is analyzed using CFD.The results show that in the contraction section of volute the conversion between dynamic pressure energy and static pressure energy essentially depends on the reduction of flow area,while in the spiral section,frictional losses also play a significant role.From the throat to the end of the volute,the flow decreases in a wave-like manner. | Senchun Miao Hongbiao Zhang Fengxia Shi Xiaohui Wang Xijin Ma | 2021 | Fluid Dynamics & Materials Processing2021，17，1： | 5 |
| 9 | Analysis of the Impact of the Space Guide Vane Wrap Angle on the Performance of a Submersible Well Pump显示文摘In order to study the influence of the wrap angle relating to the space guide vane of a submersible well pump(250QJ125)on the flow field and pump performance,seven possible configurations have been considered(obtained by changing the blade wrap angle while keeping unchanged all the other parameters).Such configurations have been numerically simulated in the framework of a computational model based on the Reynolds time-averaged N-S equations,the RNG k-εturbulence approach and the SIMPLE algorithm.The impact exerted by different wrap angles of the guide vane on the performance of the pump,the internal losses of the guide vane and the flow field distribution in the bladeless area at the guide vane outlet has been assessed via cross-comparison of all these cases.The results show that the wrap angle has a significant influence:the wrap angle with the highest head is different from that with the highest efficiency,and changes in this angle have a more significant effect on the head than efficiency.A moderate raise of the wrap angle can improve the properties of the flow,reduce turbulence losses and enhance the energy conversion rate inside the guide vane.Different wrap angles can also lead to different fluid circulation modes in the bladeless area from guide vane outlet to impeller inlet,while they have a weak influence on the absolute value of the velocity of the fluid entering the impeller. | Xiaorui Cheng Hongxing Chen Xiaoquan Wang | 2019 | Fluid Dynamics & Materials Processing2019，15，3： | 5 |
| 10 | Productivity growth in Asian manufacturing: the structural bonus hypothesis examined显示文摘 | Marcel P Timmer Adam Szirmai | 2000 | Structural Change and Economic Dynamics2000，，4： | 4 |
| 11 | Experimental Analysis of the Performances of Unit Refrigeration Systems Based on Parallel Compressors with Consideration of the Volumetric and Isentropic Efficiency显示文摘The performances of a refrigeration unit relying on compressors working in parallel have been investigated considering the influence of the compressor volumetric efficiency and isentropic efficiency on the compression ratio.Moreover,the following influential factors have been taken into account:evaporation temperature,condensation temperature and compressor suction-exhaust pressure ratio for different opening conditions of the compressor.The following quantities have been selected as the unit performance measurement indicators:refrigeration capacity,energy efficiency ratio(COP),compressor power consumption,and refrigerant flow rate.The experimental results indicate that the system refrigeration capacity and COP decrease with a decrease in evaporation temperature,increase of condensation temperature,and increase in pressure ratio.The refrigerant flow rate increases with the increase in evaporation temperature,decrease in condensing temperature and increase in pressure ratio.The compressor power consumption increases with the increase in condensing temperature and increase in pressure ratio,but is not significantly affected by the evaporation temperature. | Daoming Shen Chao Gui Jinhong Xia Songtao Xue | 2020 | Fluid Dynamics & Materials Processing2020，16，3： | 4 |
| 12 | An Investigation into the Effects of the Reynolds Number on High-Speed Trains Using a Low Temperature Wind Tunnel Test Facility显示文摘A series of tests have been conducted using a Cryogenic Wind Tunnel to study the effect of Reynolds number(Re)on the aerodynamic force and surface pressure experienced by a high speed train.The test Reynolds number has been varied from 1 million to 10 million,which is the highest Reynolds number a wind tunnel has ever achieved for a train test.According to our results,the drag coefficient of the leading car decreases with higher Reynolds number for yaw angles up to 30º.The drag force coefficient drops about 0.06 when Re is raised from 1 million to 10 million.The side force is caused by the high pressure at the windward side and the low pressure generated by the vortex at the lee side.Both pressure distributions are not appreciably affected by Reynolds number changes at yaw angles up to 30°.The lift force coefficient increases with higher Re,though the change is small.At a yaw angle of zero the down force coefficient is reduced by a scale factor of about 0.03 when the Reynolds number is raised over the considered range.At higher yaw angles the lift force coefficient is reduced about 0.1.Similar to the side force coefficient,the rolling moment coefficient does not change much with Re.The magnitude of the pitching moment coefficient increases with higher Re.This indicates that the load on the front bogie is higher at higher Reynolds numbers.The yawing moment coefficient increases with Re.This effect is more evident at higher yaw angles.The yawing moment coefficient increases by about 6%when Re is raised from 1 million to 10 million.The influence of Re on the rolling moment coefficient around the leeward rail is relatively smaller.It increases by about 2%over the considered range of Re. | Yundong Han Dawei Chen Shaoqing Liu Gang Xu | 2020 | Fluid Dynamics & Materials Processing2020，16，1： | 4 |
| 13 | A Study on the Reduction of the Aerodynamic Drag and Noise Generated By the Roof Air Conditioner of High-Speed Trains显示文摘In order to investigate how the aerodynamic drag and noise produced by the roof air conditioner of a high-speed train can be reduced,the related unsteady flow in the near-field was computed using the method of large eddy simulation.In this way,the aerodynamic source for noise generation has initially been determined.Then,the far-field aerodynamic noise has been computed in the framework of the Lighthill’s acoustics analogy theory.The propulsion height and flow-guide angle of the roof air conditioner were set as the design variables.According to the computational results,a lower propulsion height or flow-guide angle is beneficial in terms of aerodynamic drag and noise mitigation.However,compared to the design scheme with propulsion height of 0mm,the aerodynamic drag coefficient of the configuration with propulsion height of 190mm and flow-guide angle of 30°is slightly larger,while the aerodynamic noise is obviously reduced.Thus,from the viewpoint of the aerodynamic drag and noise,the design scheme with propulsion height of 190 mm and flow-guide angle of 30°is the optimal configuration in the range of conditions examined in the present work. | Jiali Liu Mengge Yu Dawei Chen Zhigang Yang | 2020 | Fluid Dynamics & Materials Processing2020，16，1： | 4 |
| 14 | CFD-Based Optimization of Hot Primary-Air Pipe Networks in Power Plant Milling Systems显示文摘A hot primary-air pipe system is the bridge connecting an air-preheater with a coal mill in power generation stations.The effective geometrical configuration of the pipe network greatly affects the air flow distribution and consequently influences the safe and economic operation of milling systems in power stations.In order to improve the properties of the air flow,in the present work the SIMPLEC method is used to simulate numerically the flow field for the original layout of the system.As a result,the internal mechanisms influencing the uneven pressure drop in each branch are explored and three optimization schemes are proposed accordingly.The numerical results indicate that,for the original layout,the local pressure drop of the tee section accounts for approximately 74%of the total drop of the system,with other pressure drops depending on the specific branch considered.It is shown that after optimization,a roughly balanced flow resistance and flow rate can be obtained.Compared with the original layout,the pressure drop relating to different branches is significantly reduced. | Qingyun Yan You Li Yuanhong Zhu Kui Cheng Xueli Huang Cong Qi Xuemin Ye | 2020 | Fluid Dynamics & Materials Processing2020，16，3： | 4 |
| 15 | On the Modeling of Non-Classical Problems Involving Liquid Jets and Films and Related Heat Transfer Processes显示文摘Non-classical subjects relating to the dynamics of jet and film flow and related heat transfer processes are considered.These problems,which are relevant to several technological applications,cannot completely be addressed in the frame of the canonical Navier-Stokes equations.The first example deals with the formation of a film flow as a result of the hydraulic shock of a vertical jet impinging on a horizontal plane.The effective thickness of the film resulting from the hydraulic shock is much less than the value obtained using the conventional approach(relying on the assumption of smooth flow),while the corresponding speed is much higher.The next case is a jet penetrating into a pool of another liquid,which under certain conditions can form a jet head of a fungoid shape.When the jet penetrates the pool,it expands sharply,and this situation is another example of circumstances where classical models are flawed.Moreover,by virtue of the intense radiating heat transfer taking place at the front of the jet,a high-temperature jet can penetrate a pool of evaporating coolant,like a“jet in a bag of steam”.These exotic problems are modeled and explained in the present article along with experimental data used for model validation.Several new hydrodynamic phenomena discovered over recent years are presented together with their practical applications,in particular,the modes of soliton-like and shock-wave decay of jets during vibration and electromagnetic resonant decomposition of the jet into droplets of a given size.These phenomena are relevant to the areas of granulation of metal melts,cooling of molten corium during postulated severe accidents in nuclear power plants and in other industrial and technological devices and processes. | Ivan V.Kazachkov | 2019 | Fluid Dynamics & Materials Processing2019，15，5： | 4 |
| 16 | Determination of the Circulation for a Large-Scale Wind Turbine Blade Using Computational Fluid Dynamics显示文摘The determination of the circulation for wind turbine blades is an important problem in engineering.In the present study,we develop a specific approach to evaluate the integral that represents mathematically the circulation.First the potentialities of the method are assessed using a two-dimensional NACA64_A17 airfoil as a testbed and evaluating the influence of different integration paths and angles of attack on the circulation value.Then the method is applied to blades with different relative heights in order to provide useful reference data to be used for the optimization and reverse design of wind turbine blades.As shown by the results,the integral value changes with the integral path,and an“optimal circle radius”exists.We calibrate the integral value by comparing its value with the lift formula.In this was we succeed in showing that there is a certain error when the radius is too small.However,the error can increase rapidly when the radius is too large.When the radius of the circle is 1–6 times the chord length,the error of all integral values is less than 5%.The optimal radius varies with the angle of attack. | Hao Cheng Guangsheng Du Meng Zhang Kun Wang Wenbin Bai | 2020 | Fluid Dynamics & Materials Processing2020，16，4： | 3 |
| 17 | A Novel Approach for the Numerical Simulation of Fluid-Structure Interaction Problems in the Presence of Debris显示文摘A novel algorithm is proposed for the simulation of fluid-structure interaction problems.In particular,much attention is paid to natural phenomena such as debris flow.The fluid part(debris flow fluid)is simulated in the framework of the smoothed particle hydrodynamics(SPH)approach,while the solid part(downstream obstacles)is treated using the finite element method(FEM).Fluid-structure coupling is implemented through dynamic boundary conditions.In particular,the software“TensorFlow”and an algorithm based on Python are combined to conduct the required calculations.The simulation results show that the dynamics of viscous and non-viscous debris flows can be extremely different when there are obstacles in the downstream direction.The implemented SPH-FEM coupling method can simulate the fluid-structure coupling problem with a reasonable approximation. | Miaomiao Ren Xiaobin Shu | 2020 | Fluid Dynamics & Materials Processing2020，16，5： | 3 |
| 18 | Influence of Diesel Engine Intake Throttle and Late Post Injection Process on the Rise of Temperature in the Diesel Oxidation Catalyst显示文摘In order to effectively implement DPF(Diesel Particulate Filters)regeneration control,thermal management of exhaust products before and inside Diesel Oxidation Catalyst(DOC)is necessary.In the present study,the Influence of the intake throttle valve and late post injection process on temperature rise inside DOC is analyzed through engine bench tests.The steady experiment results show that adjustment of the intake throttle valve can effectively increase exhaust temperature before DOC;in particular,with intake throttle valve opening at 20%,temperature before DOC can be increased by about 170℃ with respect to the full opening.An increase in the late post injection quantity can produce a significant rise of the temperature inside DOC,however its impact on the exhaust temperature before DOC is relatively limited.As the late post injection quantity increases,Hydrocarbon(HC)emissions also grow;in the present work it is shown that with a proper injection quantity,a considerable temperature increase inside the DOC can be obtained with relatively low HC emission.More specifically,with the intake throttle valve at 30%and DOC reaching ignition temperature as the late post injection quantity is increased,the exhaust temperature after DOC can be made larger than 550℃,adequate for DPF active regeneration. | Ke Sun Da Li Hao Liu Shuzhan Bai | 2020 | Fluid Dynamics & Materials Processing2020，16，3： | 3 |
| 19 | Simulation of the Pressure-Sensitive Seepage Fracture Network in Oil Reservoirs with Multi-Group Fractures显示文摘Stress sensitivity is a very important index to understand the seepage characteristics of a reservoir.In this study,dedicated experiments and theoretical arguments based on the visualization of porous media are used to assess the effects of the fracture angle,spacing,and relevant elastic parameters on the principal value of the permeability tensor.The fracture apertures at different angles show different change rates,which influence the relative permeability for different sets of fractures.Furthermore,under the same pressure condition,the fractures with different angles show different degrees of deformation so that the principal value direction of permeability rotates.This phenomenon leads to a variation in the water seepage direction in typical water-injection applications,thereby hindering the expected exploitation effect of the original well network.Overall,the research findings in this paper can be used as guidance to improve the effectiveness of water injection exploitation in the oil field industry. | Yueli Feng Yuetian Liu Jian Chen Xiaolong Mao | 2022 | Fluid Dynamics & Materials Processing2022，18，2： | 3 |
| 20 | Analysis of Gas-Solid Flow Characteristics in a Spouted Fluidized Bed Dryer by Means of Computational Particle Fluid Dynamics显示文摘In order to grasp the particle flow characteristics and energy consumption of industrial fluidized spouted beds,we conduct numerical simulations on the basis of a Computational Particle Fluid Dynamics(CPFD)approach.In particular,the traction model of Wen-Yu-Ergun is used and different inlet conditions are considered.Using a low-speed fluidizing gas,the flow state of the particles is better and the amount of particles accumulated at the bottom of the bed wall becomes smaller.For the same air intake,the energy loss of a circular nozzle is larger than that of a square nozzle. | Hongming Zhou Haozheng Gao Zheng Fang Jiangxin Yang Mingge Wu | 2020 | Fluid Dynamics & Materials Processing2020，16，4： | 3 |
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