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Numerical Simulation of the Mass Movement Process of the 2018 Sedongpu Glacial Debris Flow by Using the fluid-solid coupling Method

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Journal of Earth Science 2024年第2期35卷 583-596页

作者： Xing-Yu Long Yu-Xiang Hu Bin-Rui Gan Jia-Wen Zhou State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu610065China College of Water Resource and Hydropower Sichuan UniversityChengdu610065China

In the context of global warming and intensified human activities,glacier instability in plateau regions has increased,and glacier debris flows have become active,which poses a significant threat to the lives and property of people and socioeconomic *** mass movement process of glacier debris flows is extremely complex,so this paper uses the 2018 Sedongpu glacier debris flow event on the Qinghai-Tibet Plateau as an example and applies a numerical simulation method to invert the whole process of mass *** view of the interaction between phases in the process of motion,we use the fluid-solid coupling method to describe the mass *** granular-flow model and drift-flux model are employed in FLOW3D software to study the mass movement process of glacier debris flows and explore their dynamic *** results indicate that the glacier debris flow lasted for 700 s,and the movement process was roughly divided into four stages,including initiation,scraping,surging and deposition;the depositional characteristics calculated by the fluid-solid coupling model are consistent with the actual survey results and have good reliability;strong erosion occurs during the mass movement,the clear volume amplification effect,and the first wave climbs 17.8 m across the *** fluid-solid coupling method can better simulate glacier debris flows in plateau regions,which is helpful for the study of the mechanism and dynamic characteristics of such disasters.

关键词： glacial debris flow Qinghai-Tibet Plateau fluid-solid coupling FLOW3D mass movement depositional characteristics disasters engineering geology

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Simulation Analysis of Torsion Beam Hydroforming Based on the fluid-solid coupling Method

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Chinese Journal of Mechanical Engineering 2023年第1期36卷 139-156页

作者： Yu Huang Jian Li Jiachun Yang Yongdong Peng Weixuan Zhang Guangxi Key Laboratory of Automobile Components and Vehicle Technology Guangxi University of Science and TechnologyLiuzhou545006GuangxiChina

Hydroformed parts are widely used in industrial automotive parts because of their higher stiffness and fatigue strength and reduced weight relative to their corresponding cast and welded *** paper reports a hydraulicforming experimental platform for rectangular tube fittings that was constructed to conduct an experiment on the hydraulic forming of rectangular tube fittings.A finite element model was established on the basis of the fluid–solid coupling method and simulation *** correctness of the simulation analysis and the feasibility of the fluid–solid coupling method for hydraulic forming simulation analysis were verified by comparing the experimental results with the simulation *** the basis of the simulation analysis of the hydraulic process of the torsion beam using the fluid–solid coupling method,a sliding mold suitable for the hydroforming of torsion beams was designed for its structural *** effects of fluid characteristics,shaping pressure,axial feed rate,and friction coefficient on the wall thicknesses of torsions beams during formation were *** movement speed was related to tube *** pressure had a significant effect on rounded corners and straight *** axial feed speed was increased,and the uneven distribution of wall thicknesses was effectively *** the friction coefficient had a nonsignificant effect on the wall thickness of the ladder-shaped region,it had a significant influence on a large deformation of wall thickness in the V-shaped *** this paper,a method of fluid-solid coupling simulation analysis and sliding die is proposed to study the high pressure forming law in torsion beam.

关键词： fluid-solid coupling Hydraulic expansion Rectangular tube Torsional beam Wall thickness distribution

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fluid-solid coupling numerical simulation of charge process in variable-mass thermodynamic system

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Journal of Central South University 2012年第4期19卷 1063-1072页

作者：胡继敏金家善严志腾 College of Naval Architecture and Power Engineering Naval University of Engineering

Abstract： A joint solution model of variabk：-mass flow in two-phase region and fluid-solid coupling heat transfer, concerned about the charge process of variable-mass thermodynamic system, is built up and calculated by the finite element method （FEM）. The results are basically consistent with relative experimental data. The calculated average heat transfer coefficient reaches 1.7~105 W/（m2. K）. When the equal percentage valve is used, the system needs the minimum requirements of valve control, but brings the highest construction cost. With the： decrease of initial steam pressure, the heat transfer intensity also weakens but the steam flow increases. With the initial water filling coefficient increasing or the temperature of steam supply decreasing, the amount of accumulative steam flow increases with the growth of steam pressure. When the pressure of steam supply drops, the steam flow gradient increases during the maximum opening period of control valve, and causes the maximum steam flow to increase.

关键词： steam accumulator variable-mass control valve fluid-solid coupling numerical simulation

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fluid solid coupling model based on endochronic damage for roller compacted concrete dam

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Journal of Central South University 2013年第11期20卷 3247-3255页

作者：顾冲时魏博文徐镇凯刘大文 College of Water-Conservancy and Hydropower Hohai University College of Civil Engineering and Architecture Nanchang University

According to the characteristics of thin-layer rolling and pouting construction technology and the complicated mechanical behavior of the roller compacted concrete dam （RCCD） construction interface, a constitutive model of endochronic damage was established based on the endochronic theory and damage mechanics. The proposed model abandons the traditional concept of elastic-plastic yield surface and can better reflect the real behavior of rolled control concrete. Basic equations were proposed for the fluid-solid coupling analysis, and the relationships among the corresponding key physical parameters were also put forward. One three-dimensional finite element method （FEM） program was obtained by studying the FEM type of the seepage-stress coupling intersection of the RCCD. The method was applied to an actual project, and the results show that the fluid-solid interaction influences dam deformation and dam abutment stability, which is in accordance with practice. Therefore, this model provides a new method for revealing the mechanical behavior of RCCD under the coupling field.

关键词： roller compacted concrete dam endochronic damage fluid-solid coupling analytical model

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Active feedback control of sound radiation in elastic wave metamaterials immersed in water with fluid-solid coupling

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Acta Mechanica Sinica 2021年第5期37卷 803-825,I0002页

作者： Zhi-Hua He Yi-Ze Wang Yue-Sheng Wang Institute of Engineering Mechanics Beijing Jiaotong UniversityBeijing 100044China Department of Mechanics Tianjin UniversityTianjin 300350China

Due to their potential properties unlike traditional materials and structures,elastic wave metamaterials have received significant interests in recent *** the coupling between the acoustic and vibration,their mechanical characteristics can be tuned by the active feedback control system at low frequency ranges in which the traditional passive control is *** work illustrates that the superior performances of the effective mass density and sound pressure level(SPL)of an elastic wave metamaterial can be significantly changed by the active control,in which the periodic array of local resonators and orthogonal stiffeners are ***,based on the locally resonant mechanism,the negative density occurs over a frequency *** to the effects of lattice constant,structural damping and other parameters,the SPL with the function of fluid-solid coupling are illustrated and discussed.

关键词： Elastic wave metamaterial Local resonance Sound radiation fluid-solid coupling Active feedback control

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Influence of Coolant on Chip Forming in Gun⁃Drill Based on fluid⁃solid coupling Method

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第3期37卷 434-445页

作者： LI Liang XUE Hu SHAN Yicai YANG Yinfei HE Ning College of Mechanical Engineering Yancheng Institute of TechnologyYancheng 224051P.R.China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China College of Mechanical and Electrical Engineering Jiangsu UniversityZhenjiang 212013P.R.China College of Mechanical and Electrical Engineering Nanjing College of Information TechnologyNanjing 210046P.R.China

Chip shape is one of the important factors that affect the processing quality of the deep *** flow field of 17 mm standard gun-drill is simulated by taking the coolant pressure as a single factor variable,and the influence of coolant pressure on chip forming is discussed by combining with experiments in this *** results show that at the initial stage of chip forming,the flow of cutting fluid will intensify the lateral crimp of chips,and then affect the crimp radius of the chip and the number of turns of the crimp *** lateral crimp degree increases first and then decreases with the increase of coolant pressure,and the crimp degree is the smallest at 3 *** addition,during the chip removal process,the stream shrinking in the flow field is the main influencing factor that drive and force the chip to break again,and their influence on the chip removal and chip breaking is proportional to the coolant pressure.

关键词： gun drill chip deformation Ti6Al4V titanium alloy fluid-solid coupling

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Numerical simulation on fault water-inrush based on fluid-solid coupling theory

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Journal of Coal Science & Engineering(China) 2012年第3期18卷 291-296页

作者： HUANG Han-fu MAO Xian-biao YAO Bang-hua PU Hai School of Mining Engineering China University of Mining&TechnologyXuzhou 221116China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining&TechnologyXuzhou 221008China

About 75% water-inrush accidents in China are caused by geological structure such as faults, therefore, it is necessary to investigate the water-inrush mechanism of faults to provide references for the mining activity above confined water. In this paper, based on the fluid-solid coupling theory, we built the stress-seepage coupling model for rock, then we combined with an example of water-inrush caused by fault, studied the water-inrush mechanism by using the numerical software COMSOL Mutiphysics, analyzed the change rule of shear stress, vertical stress, plastic area and water pressure for stope with a fault, and estimated the water-inrush risk at the different distances between working faces and the fault. The numerical simula- tion results indicate that：（1） the water-inrush risk will grow as the decrease of the distance between working face and the fault; （2） the failure mode of the rock in floor with fault is shear failure; （3） the rock between water-containing fault and working face failure is the reason for water-inrush.

关键词： fault fluid-solid coupling water inrush numerical simulation

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Application of the generalized quasi-complementary energy principle to the fluid-solid coupling problem

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Journal of Marine Science and Application 2009年第1期8卷 40-45页

作者：梁立孚刘宗民郭庆勇哈尔滨工程大学航天与建筑工程学院黑龙江哈尔滨150001

The fluid-solid coupling theory, an interdisciplinary science between hydrodynamics and solid mechanics, is an important tool for response analysis and direct design of structures in naval architecture and ocean engineering. By applying the corresponding relations between generalized forces and generalized displacements, convolutions were performed between the basic equations of elasto-dynamics in the primary space and corresponding virtual quantities. The results were integrated and then added algebraically. In light of the fact that body forces and surface forces are both follower forces, the generalized quasi-complementary energy principle with two kinds of variables for an initial value problem is established in non-conservative systems. Using the generalized quasi-complementary energy principle to deal with the fluid-solid coupling problem and to analyze the dynamic response of structures, a method for using two kinds of variables simultaneously for calculation of force and displacement was derived.

关键词： fluid-solid coupling elasto-dynamics generalized quasi-complementary energy principle dynamic response

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Research on the Deformation of Anti-seepage System Considering fluid-solid coupling

Research on the Deformation of Anti-seepage System Consideri...

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第十届全国渗流力学学术会议暨2009渗流力学及应用国际论坛

作者： ZHOU Xiaojun,XUE Qiang .Institutes of Porous Mechanics,Wuhan Polytechnic University,Hubei Wuhan,430023,China .Institute of Porous Mechanics,Wuhan Polytechnic University,Hubei Wuhan,430023,China .Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Hubei Wuhan,430071,China

Based on the fluid mechanics in porous medium and the theory of fluid-solid coupling,a fluid-solid coupling mathematical model of deformation problem of anti-seepage system in landfill has been established,and the deformation features with water and leachte head in garbage dump layer decreased has been *** show that with the water head decreased,the pore pressure is progressively lowered,which makes virtual stress ***,the displacement of anti-seepage system *** the water pumping capacity in certain situation,the increasing of time will lead to the displacement increase at the same one-point position,the increasing of distance will lead to the displacement decrease at different-point *** layer should be adapted to the uneven settlement caused by the rot and displacement of the *** not only provides a reliable theoretical basis for increasing the landfill capacity,but also gives reference to the stability and protection of the landfill.

关键词： landfill anti-seepage porous medium fluid-solid coupling deformation laws

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Numerical modeling and experimental investigation of a two-phase sink vortex and its fluid-solid vibration characteristics

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第1期25卷 47-62页

作者： Zichao YIN Yesha NI Lin LI Tong WANG Jiafeng WU Zhe LI Dapeng TAN College of Mechanical Engineering Zhejiang University of TechnologyHangzhou310014China State Key Laboratory of fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou310058China

A sink vortex is a common physical phenomenon in continuous casting,chemical extraction,water conservancy,and other industrial processes,and often causes damage and loss in ***,the real-time monitoring of the sink vortex state is important for improving industrial production ***,its suction-extraction phenomenon and shock vibration characteristics in the course of its formation are complex mechanical dynamic factors for flow field state *** address this issue,we set up a multi-physics model using the level set method(LSM)for a free sink vortex to study the two-phase interaction ***,a fluid–solid coupling dynamic model was deduced to investigate the shock vibration characteristics and reveal the transition mechanism of the critical flow *** numerical results show that the coupling energy shock induces a pressure oscillation phenomenon,which appears to be a transient enhancement of vibration at the vortex penetration *** central part of the transient enhancement signal is a high-frequency *** on the dynamic coupling model,an experimental observation platform was established to verify the accuracy of the numerical *** water-model experiment results were accordant with the numerical *** above results provide a reference for fluid state recognition and active vortex control for industrial monitoring systems,such as those in aerospace pipe transport,hydropower generation,and microfluidic devices.

关键词： Free sink vortex fluid-solid coupling Level set method(LSM) Multi-physics model Vibration characteristics

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