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A flexible multiscale algorithm based on an improved smoothed particle hydrodynamics method for complex viscoelastic flows
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作者 Jinlian REN Peirong LU +2 位作者 Tao JIANG Jianfeng LIU Weigang LU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第8期1387-1402,共16页
Viscoelastic flows play an important role in numerous engineering fields,and the multiscale algorithms for simulating viscoelastic flows have received significant attention in order to deepen our understanding of the ... Viscoelastic flows play an important role in numerous engineering fields,and the multiscale algorithms for simulating viscoelastic flows have received significant attention in order to deepen our understanding of the nonlinear dynamic behaviors of viscoelastic fluids.However,traditional grid-based multiscale methods are confined to simple viscoelastic flows with short relaxation time,and there is a lack of uniform multiscale scheme available for coupling different solvers in the simulations of viscoelastic fluids.In this paper,a universal multiscale method coupling an improved smoothed particle hydrodynamics(SPH)and multiscale universal interface(MUI)library is presented for viscoelastic flows.The proposed multiscale method builds on an improved SPH method and leverages the MUI library to facilitate the exchange of information among different solvers in the overlapping domain.We test the capability and flexibility of the presented multiscale method to deal with complex viscoelastic flows by solving different multiscale problems of viscoelastic flows.In the first example,the simulation of a viscoelastic Poiseuille flow is carried out by two coupled improved SPH methods with different spatial resolutions.The effects of exchanging different physical quantities on the numerical results in both the upper and lower domains are also investigated as well as the absolute errors in the overlapping domain.In the second example,the complex Wannier flow with different Weissenberg numbers is further simulated by two improved SPH methods and coupling the improved SPH method and the dissipative particle dynamics(DPD)method.The numerical results show that the physical quantities for viscoelastic flows obtained by the presented multiscale method are in consistence with those obtained by a single solver in the overlapping domain.Moreover,transferring different physical quantities has an important effect on the numerical results. 展开更多
关键词 multiscale method improved smoothed particle hydrodynamics(sph) dissipative particle dynamics(DPD) multiscale universal interface(MUI) complex viscoelastic flow
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Smoothed-Particle Hydrodynamics Simulation of Ship Motion and Tank Sloshing under the Effect of Regular Waves
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作者 Mingming Zhao Jialong Jiao 《Fluid Dynamics & Materials Processing》 EI 2024年第5期1045-1061,共17页
Predicting the response of liquefied natural gas(LNG)contained in vessels subjected to external waves is extremely important to ensure the safety of the transportation process.In this study,the coupled behavior due to... Predicting the response of liquefied natural gas(LNG)contained in vessels subjected to external waves is extremely important to ensure the safety of the transportation process.In this study,the coupled behavior due to ship motion and liquid tank sloshing has been simulated by the Smoothed-Particle Hydrodynamics(SPH)method.Firstly,the sloshing flow in a rectangular tank was simulated and the related loads were analyzed to verify and validate the accuracy of the present SPH solver.Then,a three-dimensional simplified LNG carrier model,including two prismatic liquid tanks and a wave tank,was introduced.Different conditions were examined corresponding to different wave lengths,wave heights,wave heading angles,and tank loading rates.Finally,the effects of liquid tank loading rate on LNG ship motions and sloshing loading were analyzed,thereby showing that the SPH method can effectively provide useful indications for the design of liquid cargo ships. 展开更多
关键词 LNG carrier tank sloshing SEAKEEPING inner and external fluid coupling smoothed particle hydrodynamics(sph)
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Simulation of mould filling process using smoothed particle hydrodynamics 被引量:4
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作者 何毅 周照耀 +1 位作者 曹文炅 陈维平 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第12期2684-2692,共9页
The implementation of high pressure die casting (HPDC) filling process modeling based on smoothed particle hydrodynamics (SPH) was discussed. A new treatment of inlet boundary was established by discriminating flu... The implementation of high pressure die casting (HPDC) filling process modeling based on smoothed particle hydrodynamics (SPH) was discussed. A new treatment of inlet boundary was established by discriminating fluid particles from inlet particles. The roles of artificial viscosity and moving least squares method in the present model were compared in the handling pressure oscillation. The final model was substantiated by simulating filling process in HPDC in both two and three dimensions. The simulated results from SPH and finite difference method (FDM) were compared with the experiments. The results show the former is in a better agreement with experiments. It demonstrates the efficiency and precision of this SPH model in describing flow pattern in filling process. 展开更多
关键词 high pressure die casting (HPDC) smoothed particle hydrodynamics sph filling process moving least squares method
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Numerical Simulation of Dam Breaking Using Smoothed Particle Hydrodynamics and Viscosity Behavior 被引量:4
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作者 郑兴 段文洋 《Journal of Marine Science and Application》 2010年第1期34-41,共8页
Smoothed particle hydrodynamics (SPH) is a Lagrangian meshless particle method. It is one of the best method for simulating violent free surface flows in fluids and solving large fluid deformations. Dam breaking is a ... Smoothed particle hydrodynamics (SPH) is a Lagrangian meshless particle method. It is one of the best method for simulating violent free surface flows in fluids and solving large fluid deformations. Dam breaking is a typical example of these problems. The basis of SPH was reviewed, including some techniques for governing equation resolution, such as the stepping method and the boundary handling method. Then numerical results of a dam breaking simulation were discussed, and the benefits of concepts like artificial viscosity and position correction were analyzed in detail. When compared with dam breaking simulated by the volume of fluid (VOF) method, the wave profile generated by SPH had good agreement, but the pressure had only reasonable agreement. Improving pressure results is clearly an important next step for research. 展开更多
关键词 meshless method smoothed particle hydrodynamics sph dam breaking free surface flow
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A novel approach to determine residual stress field during FSW of AZ91 Mg alloy using combined smoothed particle hydrodynamics/neuro-fuzzy computations and ultrasonic testing 被引量:2
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作者 A.R.Eivani H.Vafaeenezhad +1 位作者 H.R.Jafarian J.Zhou 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第4期1311-1335,共25页
The faults in welding design and process every so often yield defective parts during friction stir welding(FSW).The development of numerical approaches including the finite element method(FEM)provides a way to draw a ... The faults in welding design and process every so often yield defective parts during friction stir welding(FSW).The development of numerical approaches including the finite element method(FEM)provides a way to draw a process paradigm before any physical implementation.It is not practical to simulate all possible designs to identify the optimal FSW practice due to the inefficiency associated with concurrent modeling of material flow and heat dissipation throughout the FSW.This study intends to develop a computational workflow based on the mesh-free FEM framework named smoothed particle hydrodynamics(SPH)which was integrated with adaptive neuro-fiizzy inference system(ANFIS)to evaluate the residual stress in the FSW process.An integrated SPH and ANFIS methodology was established and the well-trained ANIS was then used to predict how the FSW process depends on its parameters.To verify the SPH calculation,an itemized FSW case was performed on AZ91 Mg alloy and the induced residual stress was measured by ultrasonic testing.The suggested methodology can efficiently predict the residual stress distribution throughout friction stir welding of AZ91 alloy. 展开更多
关键词 Friction stir welding(FSW) smoothed particle hydrodynamics(sph) Adaptive neuro-fuzzy inference system(ANFIS) Ultrasonic Residual stress
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An SPH Framework for Earthquake-Induced Liquefaction Hazard Assessment of Geotechnical Structures
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作者 Sourabh Mhaski G.V.Ramana 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第1期251-277,共27页
Earthquake-induced soil liquefaction poses significant risks to the stability of geotechnical structures worldwide.An understanding of the liquefaction triggering,and the post-failure large deformation behaviour is es... Earthquake-induced soil liquefaction poses significant risks to the stability of geotechnical structures worldwide.An understanding of the liquefaction triggering,and the post-failure large deformation behaviour is essential for designing resilient infrastructure.The present study develops a Smoothed Particle Hydrodynamics(SPH)framework for earthquake-induced liquefaction hazard assessment of geotechnical structures.The coupled flowdeformation behaviour of soils subjected to cyclic loading is described using the PM4Sand model implemented in a three-phase,single-layer SPH framework.A staggered discretisation scheme based on the stress particle SPH approach is adopted to minimise numerical inaccuracies caused by zero-energy modes and tensile instability.Further,non-reflecting boundary conditions for seismic analysis of semi-infinite soil domains using the SPH method are proposed.The numerical framework is employed for the analysis of cyclic direct simple shear test,seismic analysis of a level ground site,and liquefaction-induced failure of the Lower San Fernando Dam.Satisfactory agreement for liquefaction triggering and post-failure behaviour demonstrates that the SPH framework can be utilised to assess the effect of seismic loading on field-scale geotechnical structures.The present study also serves as the basis for future advancements of the SPH method for applications related to earthquake geotechnical engineering. 展开更多
关键词 EARTHQUAKE SEISMIC LIQUEFACTION stress particle PM4Sand smoothed particle hydrodynamics(sph)
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Real-time Simulation of Gas Based on Smoothed Particle Hydrodynamics 被引量:1
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作者 ZHU Xiao-lin FAN Cheng-kai LIU Yang-yang 《Computer Aided Drafting,Design and Manufacturing》 2015年第1期68-73,共6页
This paper extends the SPH method to gas simulation. The SPH (Smoothed Particles Hydrodynamics) method is the most popular method of flow simulation, which is widely used in large-scale liquid simulation. However, i... This paper extends the SPH method to gas simulation. The SPH (Smoothed Particles Hydrodynamics) method is the most popular method of flow simulation, which is widely used in large-scale liquid simulation. However, it is not found to apply to gas simulation, since those methods based on SPH can't be used in real-time simulation due to their enormous particles and huge computation. This paper proposes a method for gas simulation based on SPH with a small number of particles. Firstly, the method computes the position and density of each particle in each point-in-time, and outlines the shape of the simulated gas based on those particles. Secondly the method uses the grid technique to refine the shape with the diffusion of particle's density under the control of grid, and get more lifelike simulation result. Each grid will be assigned density according to the particles in it. The density determines the final appearance of the grid. For ensuring the natural transition of the color between adjacent grids, we give a diffuse process of density between these grids and assign appropriate values to vertexes of these grids. The experimental results show that the proposed method can give better gas simulation and meet the request of real-time. 展开更多
关键词 gas simulation smoothed particles hydrodynamics sph 3D grid REAL-TIME
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Modelling Dam Break Evolution over a Wet Bed with Smoothed Particle Hydrodynamics: A Parameter Study
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作者 Patrick Jonsson Par Jonsen +2 位作者 Patrik Andreasson T.Staffan Lundstrom J.Gunnar I.Hellstrom 《Engineering(科研)》 2015年第5期248-260,共13页
When investigating water flow in spillways and energy dissipation, it is important to know the behavior of the free surfaces. To capture the real dynamic behavior of the free surfaces is therefore crucial when perform... When investigating water flow in spillways and energy dissipation, it is important to know the behavior of the free surfaces. To capture the real dynamic behavior of the free surfaces is therefore crucial when performing simulations. Today, there is a lack in the possibility to model such phenomenon with traditional methods. Hence, this work focuses on a parameter study for one alternative simulation tool available, namely the meshfree, Lagrangian particle method Smoothed Particle Hydrodynamics (SPH). The parameter study includes the choice of equation-of-state (EOS), the artificial viscosity constants, using a dynamic versus a static smoothing length, SPH particle spatial resolution and the finite element method (FEM) mesh scaling of the boundaries. The two dimensional SPHERIC Benchmark test case of dam break evolution over a wet bed was used for comparison and validation. The numerical results generally showed a tendency of the wave front to be ahead of the experimental results, i.e. to have a greater wave front velocity. The choice of EOS, FEM mesh scaling as well as using a dynamic or a static smoothing length showed little or no significant effect on the outcome, though the SPH particle resolution and the choice of artificial viscosity constants had a major impact. A high particle resolution increased the number of flow features resolved for both choices of artificial viscosity constants, but at the expense of increasing the mean error. Furthermore, setting the artificial viscosity constants equal to unity for the coarser cases resulted in a highly viscous and unphysical solution, and thus the relation between the artificial viscosity constants and the particle resolution and its impact on the behavior of the fluid needed to be further investigated. 展开更多
关键词 sph Dam Break smoothed particle hydrodynamics
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基于SPH算法的热仿真系统开发 被引量:1
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作者 朱子厚 董义卓 +3 位作者 车黎明 李灿灿 李敏 雷光寅 《电源学报》 CSCD 北大核心 2024年第3期46-53,共8页
随着电子设备日益微型化和集成化,热仿真已成为其设计中的关键因素。电子封装模块的热仿真通常使用传统的有限元法FEM(finite element method),存在计算效率和精度之间的矛盾,在处理大变形问题和网格畸变方面也容易造成计算不收敛,从而... 随着电子设备日益微型化和集成化,热仿真已成为其设计中的关键因素。电子封装模块的热仿真通常使用传统的有限元法FEM(finite element method),存在计算效率和精度之间的矛盾,在处理大变形问题和网格畸变方面也容易造成计算不收敛,从而导致结果错误。针对该问题,提出一种基于光滑粒子动力学SPH(smoothed particle hydrodynamics)算法的电子封装模块热仿真系统。该算法基于无网格拉格朗日数值方法,通过将热仿真对象离散为1组粒子的方式求解热传导方程,从而准确地预测电子封装模块的传热与散热,无需生成并处理大量的微小网格,不用担心网格失真等问题。SPH相对于FEM,仿真精度误差保持在1%~2%,仿真效率可提升近30倍,适合用于复杂和动态系统的模拟仿真。 展开更多
关键词 电子封装 有限元仿真 光滑粒子动力学 传热方程
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颗粒流运动SPH方法及滑坡破碎效应研究
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作者 林川 林彦喆 +2 位作者 苏燕 潘依琳 高献 《水力发电学报》 CSCD 北大核心 2024年第7期61-72,共12页
山体滑坡是全球范围内多发的一种地质灾害。由于滑坡具有突发性和破坏性强的特点,建立有效的数值分析模型将有助于制定针对性的防治策略。本文针对滑坡运动过程中表现出的颗粒流特性,基于μ(I)模型提出了针对浅层滑坡的动态摩擦系数表达... 山体滑坡是全球范围内多发的一种地质灾害。由于滑坡具有突发性和破坏性强的特点,建立有效的数值分析模型将有助于制定针对性的防治策略。本文针对滑坡运动过程中表现出的颗粒流特性,基于μ(I)模型提出了针对浅层滑坡的动态摩擦系数表达式,并构建了对应的光滑粒子流体动力学(SPH)方法求解框架。考虑到颗粒破碎对滑坡运动性的显著影响,结合基于破坏势能的颗粒破碎法则,建立μ(I)模型中基底摩擦力与颗粒分布之间的关系。通过两个经典的三维斜面模型试验,验证了μ(I)模型在滑坡运动分析中的应用价值,并进行了颗粒破碎效应参数敏感性分析,为后续滑坡灾害的防治工作提供参考。 展开更多
关键词 滑坡 μ(I)模型 光滑粒子流体动力学 颗粒破碎
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基于SPH方法的船体海洋飞沫生成形态模拟
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作者 陈家静 白旭 《船舶工程》 CSCD 北大核心 2024年第4期66-72,89,共8页
为了研究海洋飞沫的生成形态,采用光滑粒子法(SPH)的粒子捕捉技术,分析4种常见的船首特征对海洋飞沫轨迹的影响。研究发现,船首的设计在飞沫的生成和运动特性上起着决定性作用。球鼻艏和破冰艏通过镇压波浪减少飞沫的覆盖范围,而飞剪艏... 为了研究海洋飞沫的生成形态,采用光滑粒子法(SPH)的粒子捕捉技术,分析4种常见的船首特征对海洋飞沫轨迹的影响。研究发现,船首的设计在飞沫的生成和运动特性上起着决定性作用。球鼻艏和破冰艏通过镇压波浪减少飞沫的覆盖范围,而飞剪艏和前倾艏则利用其独特的流线型设计有效地对飞沫进行引流,但却导致飞沫的生成高度较高,覆盖范围较广。此外,研究还揭示了不同类型的飞沫(如崩波破碎、卷波和激散波破碎)在船首附近的工况和轨迹模式。研究结果可为船舶设计优化及防除冰技术提供重要理论支持。 展开更多
关键词 船舶积冰 海洋飞沫 船首形状 光滑粒子法
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规则波与浮式防波堤相互作用的SPH模拟研究 被引量:1
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作者 杨亚菲 蔡国朕 +1 位作者 曹露 高运 《水运工程》 2024年第2期9-15,21,共8页
相较于传统防波堤,浮式防波堤因具有方便安装、可实现水质交换、可在多种环境下施工以及可移动等优点得到了广泛发展。采用光滑粒子流体动力学(SPH)方法,研究规则波与浮式防波堤的相互作用。首先在空水槽中基于规则波传播算例进行粒子... 相较于传统防波堤,浮式防波堤因具有方便安装、可实现水质交换、可在多种环境下施工以及可移动等优点得到了广泛发展。采用光滑粒子流体动力学(SPH)方法,研究规则波与浮式防波堤的相互作用。首先在空水槽中基于规则波传播算例进行粒子间距的收敛性分析,然后基于验证的水槽模型模拟规则波与单浮体、双浮体的相互作用,并分析了浮体前后波形、浮体的运动及浮体附近的流速场。结果表明,双浮体防波堤相比单浮体防波堤能够显著提升消波性能。 展开更多
关键词 光滑粒子流体动力学 规则波 浮式防波堤 浮体运动 流速场
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Numerical Simulations of Wave Impact Forces on the Open-Type Sea Access Road Using A Two-Phase SPH Model
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作者 CHEN Yong-kun Domenico D.MERINGOLO LIU Yong 《China Ocean Engineering》 SCIE EI CSCD 2024年第5期755-770,共16页
A numerical study based on a two-dimensional two-phase SPH(Smoothed Particle Hydrodynamics)model to analyze the action of water waves on open-type sea access roads is presented.The study is a continuation of the analy... A numerical study based on a two-dimensional two-phase SPH(Smoothed Particle Hydrodynamics)model to analyze the action of water waves on open-type sea access roads is presented.The study is a continuation of the analyses presented by Chen et al.(2022),in which the sea access roads are semi-immersed.In this new configuration,the sea access roads are placed above the still water level,therefore the presence of the air phase becomes a relevant issue in the determination of the wave forces acting on the structures.Indeed,the comparison of wave forces on the open-type sea access roads obtained from the single and two-phase SPH models with the experimental results shows that the latter are in much better agreement.So in the numerical simulations,a two-phaseδ-SPH model is adopted to investigate the dynamical problems.Based on the numerical results,the maximum horizontal and uplifting wave forces acting on the sea access roads are analyzed by considering different wave conditions and geometries of the structures.In particular,the presence of the girder is analyzed and the differences in the wave forces due to the air cushion effects which are created below the structure are highlighted. 展开更多
关键词 smoothed particle hydrodynamics two-phase sph wave impact forces experimental test sea access road
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固体推进剂药浆立式混合过程SPH方法研究
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作者 洪寅 刘看 +2 位作者 武毅 吴艳青 杨秀峰 《含能材料》 EI CAS CSCD 北大核心 2024年第11期1162-1173,共12页
立式混合机内桨叶的行星运动可有效促进物料不同组分间的分散循环和均质分布,故已应用于固体推进剂药浆的制备过程。然而,混合机内的复杂界面及其运动导致药浆内部的混合机理与流变特性难以采用传统的方法进行研究。针对层流流动下推进... 立式混合机内桨叶的行星运动可有效促进物料不同组分间的分散循环和均质分布,故已应用于固体推进剂药浆的制备过程。然而,混合机内的复杂界面及其运动导致药浆内部的混合机理与流变特性难以采用传统的方法进行研究。针对层流流动下推进剂药浆与桨叶耦合过程,基于光滑粒子法(Smoothed Particle Hydrodynamics,SPH),连续体被离散为若干携带物理量的守恒质点。结合Herschel-Bulkley(HB)本构模型,发展了适用于非牛顿流体状态下推进剂药浆混合过程的无网格方法。将数值模拟和实验进行对比,验证所提出模型的准确性。通过探究桨叶运动参量与功率消耗的相关性,分析了几何构型、转动模式对药浆混合均匀程度及叶轮扭矩负载的影响规律。研究结果表明,若剪切速率指数n为0.47时,液体在非牛顿流动状态下,模拟结果相对文献实验结果的平均误差约为4.98%,故两者具有良好的一致性。行星叶轮搅拌2.65 s后,其混合均匀性指数相比于中心、偏心叶轮依次提高了8.9%和7.3%。而雷诺数Re=1时,公转半径在0.11D_(w)~0.23D_(w)范围内,扭矩的最大增幅可达38.4%。 展开更多
关键词 固体推进剂药浆 非牛顿流体 行星叶轮 光滑粒子法(sph)
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基于PCISPH的流体粒子飞溅改进方法
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作者 钮倩倩 林绿开 李毅 《计算机技术与发展》 2024年第2期60-64,共5页
流体飞溅是自然界中最常见的流体现象。流体模拟是计算机图形学的一个重要研究分支。流体模拟已经广泛应用于电影、游戏和其他工业数值领域。由于飞溅场景中流体的密度和压力的速率变化非常大,因此模拟对离散化解的精度要求很高。对于... 流体飞溅是自然界中最常见的流体现象。流体模拟是计算机图形学的一个重要研究分支。流体模拟已经广泛应用于电影、游戏和其他工业数值领域。由于飞溅场景中流体的密度和压力的速率变化非常大,因此模拟对离散化解的精度要求很高。对于流体粒子飞溅模拟数值不稳定,且缺乏真实效果,针对经典的预测校正不可压缩SPH(PCISPH),该文提出了基于粒子表面流体飞溅改进的泊松压力解的方法,通过替换压力源项提高了模拟精度。实验结果表明,该方法中流体的压力分布较之经典方法更接近现实的流体粒子飞溅模拟效果,并且改进后的方法经过剧烈运动后帧率仍符合实时性仿真效果的要求,保证了良好的压力稳定性和真实感。该文通过Anaconda3集成Python3和Taichi环境实现流体仿真实验。 展开更多
关键词 光滑粒子流体动力学 流体模拟 粒子飞溅改进 预测校正不可压缩sph 泊松方程 太极编程
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基于SPH模型的尾矿库溃坝风险模拟研究
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作者 周玉希 张欣欣 樊萌 《中国资源综合利用》 2024年第7期99-101,共3页
作为一种具有高势能的危险源,尾矿库可能发生溃坝事故,进而产生泥石流,造成严重的人员伤亡和经济损失。传统的深度积分方法在模拟泥石流演进过程时存在局限性,而光滑粒子流体动力学(Smoothed Particle Hydrodynamics,SPH)是一种新型的... 作为一种具有高势能的危险源,尾矿库可能发生溃坝事故,进而产生泥石流,造成严重的人员伤亡和经济损失。传统的深度积分方法在模拟泥石流演进过程时存在局限性,而光滑粒子流体动力学(Smoothed Particle Hydrodynamics,SPH)是一种新型的数值模拟方法,可以弥补传统方法的缺陷。以攀枝花市某尾矿库为例,构建溃坝泥石流的SPH模型,模拟不同工况下泥石流的演进过程,获得泥石流的流量数据,研究溃口宽度与深度对泥石流演进特征的影响。模拟结果与实际情况较为吻合,因此SPH模型可以有效模拟尾矿库溃坝风险。研究结果为尾矿库安全管理和风险防控提供新方法,有利于保障人民群众的生命财产安全,促进矿业可持续发展。 展开更多
关键词 尾矿库 溃坝风险 光滑粒子流体动力学(sph) 数值模拟
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基于SPH方法的搅拌摩擦焊数值模拟研究
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作者 韩泽平 曹丽杰 《上海工程技术大学学报》 CAS 2024年第1期50-56,共7页
光滑粒子流体动力学(smoothed particle hydrodynamics,SPH)法是基于拉格朗日的一种无网格法,基于SPH方法使用ABAQUS软件进行AZ31B镁合金的搅拌摩擦焊数值模拟,通过改变搅拌头转速,研究残余应力和温度的分布。结果显示:焊缝两侧残余应... 光滑粒子流体动力学(smoothed particle hydrodynamics,SPH)法是基于拉格朗日的一种无网格法,基于SPH方法使用ABAQUS软件进行AZ31B镁合金的搅拌摩擦焊数值模拟,通过改变搅拌头转速,研究残余应力和温度的分布。结果显示:焊缝两侧残余应力分布呈不对称,后退侧应力大于前进侧;应力曲线具有双峰特征,在焊接区域表现为拉应力;随着转速的增加,工件应力分布更加均匀;焊缝两侧的温度呈不对称分布,且前进侧高于后退侧,随着转速的增加,温度呈上升趋势;纵向温度曲线呈M形分布。模拟结果对实际焊接过程中焊接参数的选择具有一定参考意义。 展开更多
关键词 搅拌摩擦焊 光滑粒子流体动力学 残余应力 温度场 AZ31B镁合金
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基于SPH方法的叶片鸟撞数值模拟研究 被引量:36
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作者 刘军 李玉龙 刘元镛 《振动与冲击》 EI CSCD 北大核心 2008年第9期90-93,共4页
基于显式碰撞动力分析软件PAM-CRASH及其提供的SPH方法,建立了鸟撞平板叶片数值分析模型。通过SPH方法、Lagrange方法结果和实验结果三者对比,指出SPH方法比Lagrange方法的数值计算结果更贴近试验结果。还应用SPH方法,研究了圆柱体、两... 基于显式碰撞动力分析软件PAM-CRASH及其提供的SPH方法,建立了鸟撞平板叶片数值分析模型。通过SPH方法、Lagrange方法结果和实验结果三者对比,指出SPH方法比Lagrange方法的数值计算结果更贴近试验结果。还应用SPH方法,研究了圆柱体、两端带半球的圆柱体、椭球体三种不同几何构型的鸟体对计算结果的影响。最后,计算了实验条件下易出现损伤的叶片根部不同时刻的应变分布及应力分布。 展开更多
关键词 数值模拟 鸟撞 sph 叶片
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基于SPH法的CBN磨粒切削过程数值模拟 被引量:12
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作者 宿崇 许立 +1 位作者 刘元伟 马纪军 《中国机械工程》 CAS CSCD 北大核心 2013年第5期667-671,共5页
采用光滑粒子流体动力学法进行CBN磨粒切削过程仿真。该方法解决了网格法模拟材料分离时的网格束缚问题。通过切削过程中磨粒与工件材料的应力场变化以及离散SPH粒子的运动情况,分析了CBN磨粒的磨损机理以及工件材料的切削变形机理。研... 采用光滑粒子流体动力学法进行CBN磨粒切削过程仿真。该方法解决了网格法模拟材料分离时的网格束缚问题。通过切削过程中磨粒与工件材料的应力场变化以及离散SPH粒子的运动情况,分析了CBN磨粒的磨损机理以及工件材料的切削变形机理。研究结果表明:磨粒的顶部与挤压面棱边接触应力集中,易发生磨耗与微破碎磨损;工件材料受磨粒的推挤发生弹塑性变形而沿磨粒的侧向及前方隆起,并于磨粒的前方挤出而形成切屑。 展开更多
关键词 CBN磨粒 磨损 仿真 光滑粒子流体动力学法
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基于FEM与SPH耦合算法的单颗磨粒切削玻璃的动态过程仿真 被引量:15
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作者 段念 王文珊 +2 位作者 于怡青 黄辉 徐西鹏 《中国机械工程》 EI CAS CSCD 北大核心 2013年第20期2716-2721,共6页
采用有限元法(FEM)与光滑质点流体动力学法(SPH)耦合算法,假设以圆锥作为磨粒的形状,以玻璃为工件材料,进行了单颗金刚石磨粒的三维磨削仿真。仿真结果表明:磨粒的挤压使工件材料向前方及两侧流动而产生隆起,且磨屑发生粉末化现象;沟槽... 采用有限元法(FEM)与光滑质点流体动力学法(SPH)耦合算法,假设以圆锥作为磨粒的形状,以玻璃为工件材料,进行了单颗金刚石磨粒的三维磨削仿真。仿真结果表明:磨粒的挤压使工件材料向前方及两侧流动而产生隆起,且磨屑发生粉末化现象;沟槽的实际宽度远大于磨粒的切削宽度,断裂裂纹向沟槽两侧扩张,裂纹扩展一段后就停止不前而残留下来,成为残留裂纹。该方法可以较好地解决传统有限元法进行脆性材料磨削仿真时容易发生单元畸变的问题,验证了FEM与SPH耦合算法应用于脆性材料磨削仿真研究的可行性。 展开更多
关键词 单颗金刚石加工 有限元法 光滑质点流体动力学(sph) 脆性材料
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