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| 1 | ADAPTIVE FEM ANALYSIS FOR TWO-DIMENSIONAL UNCONFINED SEEPAGE PROBLEMS显示文摘ADAPTIVEFEMANALYSISFORTWO-DIMENSIONALUNCONFINEDSEEPAGEPROBLEMS￥ChenSheng-hong(WuhanUniversityofHydraulicandElectricalEngineer... | Chen, Shenghong | 1996 | Journal of Hydrodynamics1996，8，1： | 10 |
| 2 | NUMERICAL PREDICTION OF THREE DIMENSIONAL HIGHLYTURBULENT FLOW WITH FREE SURFACES显示文摘NUMERICALPREDICTIONOFTHREEDIMENSIONALHIGHLYTURBULENTFLOWWITHFREESURFACES￥MaFu-xi(NorthChinaInstituteofWaterConservancyandHydr... | Ma, Fuxi | 1995 | Journal of Hydrodynamics1995，7，1： | 7 |
| 3 | Investigation of the Effects of Baffles on the Shallow Water Sloshing in A Rectangular Tank Using A 2D Turbulent ISPH Method显示文摘Liquid sloshing is a common phenomenon in the liquid tanks transportation. Liquid waves lead to fluctuating forces on the tank wall. Uncontrolled fluctuations lead to large forces and momentums. Baffles can control these fluctuations. A numerical method, which has been widely used to model this phenomenon, is Smoothed Particle Hydrodynamics(SPH). The Lagrangian nature of this method makes it suitable for simulating free surface flows. In the present study, an accurate Incompressible Smoothed Particle Hydrodynamics(ISPH) method is developed and improved using the kernel gradient correction tensors, particle shifting algorithms, k–ε turbulence model, and free surface particle detectors. Comparisons with the experimental data approve the ability of the present algorithm for simulating shallow water sloshing. The main aim of this study is to investigate the effects of the vertical baffle on the damping of liquid sloshing. Results show that baffles number has a major role in sloshing fluctuation damping. | Rahim SHAMSODDINI Bahador ABOLPUR | 2019 | China Ocean Engineering2019，33，1： | 7 |
| 4 | Surface free energy of copper-zinc alloy for energy-saving of boiler显示文摘Cu-Zn, Cu-Zn-Sn, Cu-Zn-Ni alloys were melted by vacuum smelter. The effect factors to the surface free energy of the alloys such as chemical composition, crystal structure and surface crystal lattice distortion etc. were investigated by OCA30 automatic contact angle test instrument, metallography microscope and XRD instrument etc. Results suggests: adding alloy element to Cu may increase its surface free energy, and the more kinds of alloy elements are added, the more surface free energy increases; the alloy element Sn an increase the surface free energy of Cu-Zn alloy; Cu-Zn alloy with fir-tree crystal structure, great phase discrepancy and obvious composition aliquation has greater surface free energy; Cu-Zn alloy with compounds and serious surface crystal lattice distortion has greater surface free energy. | WANG Man LIANG Jinsheng TANG Qingguo MING Xing MENG Junping DING Yan | 2006 | Rare Metals2006，25，z1： | 6 |
| 5 | THE APPLICATIONS AND STUDY OF NUMERICAL SIMULATION OF TURBULENCE FLOW WITH FREE SURFACE IN HYDRAULIC SPILL WAYS STRUCTURE显示文摘The turbulence flow Free Surface has important applications in hydraulic spillways structure,such as the hydraulic jump,energy dissipation flow etc.This is being considered as very complicated flow,and has not yet been solved quite well by numerical method. In this paper,a Large-scale computational software package are developed for numerical laboratory of hydraulic spillway structure.Some methods,such as turbulence model, free surface and irregular boundary treating techniques,scientific computer visualization are put forward and performed. | Dai Hui-chaoChina Yangtze Three Gorges Project Development Corporation,Yichang 443002,P. R.China | 1997 | Journal of Hydrodynamics1997，9，4： | 5 |
| 6 | Using thermodynamic parameters to study self-healing and interface properties of crumb rubber modified asphalt based on molecular dynamics simulation显示文摘The thermodynamic property of asphalt binder is changed by the addition of crumb rubber,which in turn influences the self-healing property as well as the cohesion and adhesion within the asphalt-aggregate system.This study investigated the self-healing and interface properties of crumb rubber modified asphalt(CRMA)using thermodynamic parameters based on the molecular simulation approach.The molecular models of CRMA were built with representative structures of the virgin asphalt and the crumb rubber.The aggregate was represented by SiO2 and Al2O3 crystals.The selfhealing capability was evaluated with the thermodynamic parameter wetting time,work of cohesion and diffusivity.The interface properties were evaluated by characterizing the adhesion capability,the debonding potential and the moisture susceptibility of the asphalt-aggregate interface.The self-healing capability of CRMA is found to decrease as the rubber content increases.The asphalt-Al2O3 interface with higher rubber content has stronger adhesion and moisture stability.But the influence of crumb rubber on the interfacial properties of asphalt-SiO2 interface has no statistical significance.Comparing with the interfacial properties of the asphalt-SiO2 interface,the asphalt-Al2O3 interface is found to have a stronger adhesion but a worse moisture susceptibility for its enormous thermodynamic potential for water to displace the asphalt binder. | Dongliang HU Jianzhong PEI Rui LI Jiupeng ZHANG Yanshun JIA Zepeng FAN | 2020 | Frontiers of Structural and Civil Engineering2020，14，1： | 5 |
| 7 | Multi-lens stereo reconstruction of wave surface in a wave basin显示文摘A new method is developed to measure the wave surface elevation in a wave basin.A thin film of tiny granules floating on the free surface ensures the formation of the dot grid pattern on the wave surface.The dot grid pattern is generated by a high-brightness projector.The granule film has little influence on the wave propagation in a wave basin.The measuring system is validated by the experiments of the propagation of solitary wave in water of uniform depth.It turns out that the time series of the surface elevation measured by the multi-lens stereo reconstruction method agree well with that measured by wave gauges.The errors of the measuring system are discussed.This work sheds a light on measuring the local wave field with high precision and efficiency in laboratory. | Qian Wang Yong-liu Fang Hua Liu | 2019 | Journal of Hydrodynamics2019，31，5： | 5 |
| 8 | Baroclinic Instability in the Generalized Phillips'Model PartI:Two-layer Model显示文摘BaroclinicInstabilityintheGeneralizedPhillips'ModelPartI:Two-layerModelLiYang(李扬)andMuMu(穆穆)(LASG,InstituteofAtmosphericPhysi... | 李扬 穆穆 | 1996 | Advances in Atmospheric Sciences1996，13，1： | 4 |
| 9 | EXAMINATION OF THE SURFACE FREE ENERGY AND ACID-BASE PROPERTIES OF CELLULOSE BY THE COLUMN WICKING TECHNIQUE AND THE CRITICAL PACKING HEIGHT/DENSITY显示文摘The column wicking technique was applied to estimate the surface free energy of cellulose, the importance of which is to obtain a real effective capillary radius, Reff, initially from the plot of Washburn penetration distance versus time. Since the cellulose sample could not be packed with good reproducibility, therefore, Reff can not be obtained readily from the slope of the plot. A method was developed in this paper by uniting all apparent packing heights with a unique value to deduce a real effective capillary radius. Based on the defined critical packing height related to the critical packing density, the surface free energy and acid-base properties of cellulose Sigma C8002 were estimated. | 沈青 | 2004 | Chinese Journal of Polymer Science2004，22，1： | 4 |
| 10 | Closed-form solutions for free vibration of rectangular FGM thin plates resting on elastic foundation显示文摘This article presents closed-form solutions for the frequency analysis of rectangular functionally graded material(FGM) thin plates subjected to initially in-plane loads and with an elastic foundation. Based on classical thin plate theory, the governing differential equations are derived using Hamilton's principle. A neutral surface is used to eliminate stretching–bending coupling in FGM plates on the basis of the assumption of constant Poisson's ratio. The resulting governing equation of FGM thin plates has the same form as homogeneous thin plates. The separation-ofvariables method is adopted to obtain solutions for the free vibration problems of rectangular FGM thin plates with separable boundary conditions, including, for example, clamped plates. The obtained normal modes and frequencies are in elegant closed forms, and present formulations and solutions are validated by comparing present results with those in the literature and finite element method results obtained by the authors. A parameter study reveals the effects of the power law index n and aspect ratio a/b on frequencies. | T. F. Xu Y. F. Xing | 2016 | Acta Mechanica Sinica2016，32，6： | 4 |
| 11 | 基于贴体旋转交错网格的起伏地表地震波有限差分数值模拟(英文)显示文摘有限差分法计算效率高,在地震数值模拟中被广泛应用,但其不能灵活处理起伏地表。基于贴体网格的曲线坐标变换可用来解决该问题,如基于插值近似的标准交错网格(SSG, standard-staggered-grid)有限差分法、基于MacCormack类的同位网格中心差分法和满足交错分布的全交错网格有限差分法。与上述差分方法相比,旋转交错网格(RSG,rotated-staggered-grid)有限差分法满足曲线坐标系下波动方程的空间分布,不需要额外增加内存和计算量,实现过程简单。为此本文提出了采用旋转交错网格(RSG,rotated-staggered-grid)求解曲线坐标系下一阶应力-速度方程的方法,同时引入一种适合RSG的高精度单边仿真型有限差分(UMFD,unilateral mimetic finite difference)算子来处理起伏地表的自由边界条件。数值模拟结果显示,在RSG有限差分中,采用UMFD法处理自由边界得到的数值解比真空法精度高,且当最短波长内网格点较少时,在一定程度上能有效避免面波频散现象;RSG有限差分法、谱元法和MacCormack类同位网格法三种方法的模拟结果具有较高的一致性,但RSG有限差分法的计算效率比谱元法和MacCormack类同位网格法高。 | 成景旺 范娜 张友源 吕晓春 | 2018 | Applied Geophysics2018，15，3： | 3 |
| 12 | Numerical simulation of two-phase turbulent flow in hydraulic and hydropower engineering显示文摘In connection with the specific features of high velocity aerated flow generated by hydraulic engineering structures, the mathematical model is developed for high turbulence air-water two-phase flow with the use of twin flow theoretical model in this paper. Furthermore the numerical method is proposed to treat bubbled flows. In addition, on the basis of air-water stratified twin flow model, the new calculation methods and free surface tracking technique are proposed to describe complicated movements of the free surface. Finally, the proposed model is used to calculate artificial aerated flows. The computed results coincide quite well with experimental results. This means that the proposed method can provide solid basis for practical engineering design. | DAI HuiChao1,2?, WANG LingLing1, GAO JiZhang3, ZHANG XiaoDong3 & YANG ZhongHua2 1 College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China 2 China Yangtze River Three Gorges Project Development Corporation, Yichang 443002, China 3 China Institute of Water Resources and Hydropower Research, Beijing 100044, China | 2007 | Science China(Technological Sciences)2007，50，z1： | 3 |
| 13 | THE MACCORMACK SCHEME AND THE BOUNDARY-FITTED COORDINATE SYSTEM FOR NUMERICAL SIMULATION OF SUPER CRITICAL FREE SURFACE FLOWS显示文摘This paper is concerned with the mathematical model for the numerical simulation of supercritical surface flows. A boundary-fitted coordinate system was used to overcome the difficulties and inaccuracy associated with the determination of flow characteristics near the fl ow boundaries. The MacCormack scheme was applied for the solution of the transfo rmed system of equations. Comparisions between computed results and experimental data show a satisfactory agreement. | Wei Wen-li (Department of Hydraulic Engineering, Xi’an University of Techology, Xi’an 710048, China) (The State Key Laboratory of Ocean and Offshore Engineering, Dalian University of Technology, Dalian 116023, China) Liu Yu-ling, Wang De-yi (Department | 2002 | Journal of Hydrodynamics2002，14，1： | 3 |
| 14 | Gas hydrate fast nucleation from melting ice and quiescent growth along vertical heat transfer tube显示文摘During the observation of HCFC141b gas hydrate growth processes outside a ver- tical heat transfer tube, two exciting phenomena were found: fast nucleation of gas hydrate from melting ice, and the spontaneous permeation of water into the guest phases along the surface of heat transfer tube to form gas hydrate continuously. These two phenomena were explained with Zhou & Sloan’s hypothesis and the theory of surface free energy respectively, and a novel method of gas hydrate formation was presented——gas hydrate fast nucleation from melting ice and quiescent growth along heat transfer tube. There is no mechanic stirring in this method, the formed gas hydrates are compact, the ratio of unreacted interstitial water is little, which overcome the drawback of high energy cost and high ratio of unreacted interstitial water among the formed gas hydrates in the system with mechanic stirring. This finding will benefit the gas hydrate ap- plication technologies such as natural gas storage technology or cool storage technology with gas hydrate. | XIE Yingming1,2, GUO Kaihua2, LIANG Deqing2, FAN Shuanshi2, GU Jianming1 & CHEN Jinggui2 1. Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai 200030, China 2. Guangzhou Institute of Energy Conversion, The Chinese Academy of Sciences, Guangzhou 510640, China | 2005 | Science China Chemistry2005，48，1： | 3 |
| 15 | NUMERICAL SIMULATION OF A TWO-DIMENSIONAL SQUARE MOVING NEAR FREE SURFACE显示文摘WT5”BZ]The body moving near the free surface is a focus in fluid dynamic research. Many numerical methods were developed for the simulation of the induced flow field. In this paper, a two-dimensional square moving near the free surface was simulated by the volume of fluid method (VOF). The flow field and drag exerted on the square were studied. The drag would increase due to the presence of the free surface. The iteration factor of the pressure interpolation of surface cells was modified, and through this modification the iteration became more stable. The capability of dealing with the large deformation of the free surface was raised. [WT5”HZ] | Hong, F.W. Zhao, F. Zhou, L.D. | 2001 | Journal of Hydrodynamics2001，13，1： | 3 |
| 16 | An approach for machining distortion measurements and evaluation of thin-walled blades with small datum显示文摘Inspection techniques for aero-engine blades are a hot topic in industry. Since these blades have a sculptured surface and a small datum, measurement results may deviate from an actual position. There are few proper approaches compensating for non-uniform distribution errors that are within specified tolerance ranges. This study aimed to develop a meshing structure measuring approach for the distortion of blades via non-contact optical 3D scanning. A rough measurement and a registration procedure are initially adopted to rectify the coordinate system of a blade, which avoids the initial coordinate system errors caused by the small datum. A measurement path with meshing structure is then unfolded on the blade surface. For non-uniform distribution errors, the meshing structure measurement is more visual and clear than the traditional constant height curves method. All measuring points take only 7 min to complete, and the distribution of error is directly and accurately presented by the meshing structure. This study provides a basis for future research on distortion control and error compensation. | Yu Jianhua Chen Zhitong Jiang Zepeng | 2016 | Chinese Journal of Aeronautics2016，29，6： | 2 |
| 17 | Experimental Study on Sloshing Characteristics in the Elastic Tank Based on Morlet Wavelet Transform显示文摘Hydroelastic effect of sloshing is studied through an experimental investigation. Different excitation frequencies are considered with low-fill-depth and large amplitude. Morlet wavelet transform is introduced to analyze the free surface elevations and sloshing pressures. It focuses on variations and distributions of the wavelet energy in elastic tanks. The evolutions of theoretical and experimental wavelet spectra are discussed and the corresponding Fourier spectrums are compared. Afterwards, average values of the wavelet spectra are extracted to do a quantitative study at various points. From the wavelet analysis, sloshing energies are mainly distributed around the external excitation frequency and expanded to high frequencies under violent condition. In resonance, experimental wavelet energy of the elevation in elastic tanks is obviously less than that in the rigid one; for sloshing pressures, the elastic wavelet energy close to the rigid one and conspicuous impulse is observed. It recommends engineers to concern the primary natural frequency and impulsive peak pressures. | JIANG Mei-rong ZHONG Wen-jun YU Jian-xing LIU Pei-lin YIN Han-jun WANG Shou-dong MA Yu-xiang | 2018 | China Ocean Engineering2018，32，4： | 2 |
| 18 | Water entry of decelerating spheres simulations using improved ISPH method显示文摘In this paper, we simulated the vertical impact of spheres on a water surface using three-dimensional incompressible smoothed particle hydrodynamics(3-D ISPH) method. The sphere motion is taken to be a rigid body motion and it is modeled by ISPH method. The governing equations are discretized and solved numerically using ISPH method. A stabilized incompressible SPH method by relaxing the density invariance condition is adopted. Here, we computed the motions of a rigid body by direct integration of the fluid pressure at the position of each particle on the body surface. The equations of translational and rotational motion were integrated in time domain to update the position of the rigid body at each time step. In this study, we improved the boundary treatment between fluid and fixed solid boundary by using virtual marker technique. In addition, an improved algorithm based on the virtual marker technique for the boundary particles is proposed to treat the moving boundary of the rigid body motion. The force exerted on the moving rigid boundary particles by the surrounding particles, is calculated by the SPH approximation at the virtual marker points. The applicability and efficiency of the current ISPH method are tested by comparison with reference experimental results. | Abdelraheem M.Aly Mitsuteru Asai | 2018 | Journal of Hydrodynamics2018，30，6： | 2 |
| 19 | Effect of surface free energy of acetylene black powder on air electrode performance显示文摘The effects of acetylene black powder surface free energy on air electrode electrochemical performance and lifetime were studied. The acetylene black was immersed in 30% H2O2 at room temperature and the changes of functional groups and surface free energy were investigated by X-ray Photoelectron Spectroscopy (XPS) and powder contact angle (CA). The air electrode performance was characterized by the potential polarization curves and the lifetime was measured by constant-current discharge. It shows that, its surface free energy is the lowest when the acetylene black is immersed in H2O2 for 240 h. The polarization potential of the air electrode prepared by the pretreated acetylene black is 0.25 V(vs. Hg/HgO), 0.21 V lower than the air electrode with untreated acetylene black when the working current density is 100 mA·cm-1. And its lifetime is over 800 h at 80 mA·cm-1. The pretreatment of acetylene black for proper time by H2O2 is favorable for the stability of the tri-phase reaction interface of air electrode and improvement of its performance. | OU Xiuqin LIU Shuguang LIANG Guangchuan LI Ying ZHI Xiaoke HAN Bin | 2006 | Rare Metals2006，25，z1： | 1 |
| 20 | Numerical simulation of dam break flow impact on vertical cylinder by cumulant lattice Boltzmann method显示文摘The purpose of this study is to apply the cumulant lattice Boltzmann method(LBM)to simulate high Reynolds number free surface flows.The single-phase cumulant LBM is extended to solve the free surface flows by using the phase-field method as the interface capturing scheme.Numerical simulations are performed on an experimental problem of dam break flow impact on a vertical cylinder.Important numerical aspects such as collision model,grid resolution,time step and interface mobility parameter are investigated.It is found that the severe impact pressure oscillation in the simulation by the conventional SRT model,can be significantly suppressed by the cumulant model.Good agreement between the cumulant LBM numerical simulation and the experiment has been obtained on both the free surface profiles and the impact pressures.The numerical results obtained by the present study demonstrate that the cumulant LBM can be a powerful numerical tool for simulations of violent free surface flow problems. | Seiya Watanabe Shintaro Fujisaki Changhong Hu | 2021 | Journal of Hydrodynamics2021，33，2： | 1 |
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