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| 1 | 光滑粒子法及其与有限元耦合算法的研究进展显示文摘拉格朗日型的有限元法和光滑粒子法在模拟材料大变形问题时各存优缺点,而有限元与光滑粒子耦合算法实现了在小变形区域采用有限元法计算,在局部的大变形区域采用光滑粒子法计算,有效地综合了有限元法计算效率高和光滑粒子法能够自然地模拟材料大变形问题的特点.重点论述了有限元法、光滑粒子法以及有限元与光滑粒子耦合算法的研究现状及应用进展,并讨论了各方法中需要进一步解决的问题.最后通过算例对3种方法的计算精度和计算效率进行了分析,供研究人员参考. | 胡德安 韩旭 肖毅华 杨刚 | 2013 | 力学学报2013，45，5： | 33 |
| 2 | On the treatment of solid boundary in smoothed particle hydrodynamics显示文摘As a popular meshfree particle method,the smoothed particle hydrodynamics(SPH) has suffered from not being able to di-rectly implement the solid boundary conditions.This influences the SPH approximation accuracy and hinders its further de-velopment and application to engineering and scientific problems.In this paper,a coupled dynamic solid boundary treatment(SBT) algorithm has been proposed,after investigating the features of existing SPH SBT algorithms.The novelty of the cou-pled dynamic SBT algorithm includes a new repulsive force between approaching fluid and solid particles,and a new numeri-cal approximation scheme for estimating field functions of virtual solid particles.The new SBT algorithm has been examined with three numerical examples including a typical dam-break flow,a dam-break flow with a sharp-edged obstacle,and a water entry problem.It is demonstrated that SPH with this coupled dynamic boundary algorithm can lead to accurate results with smooth pressure field,and that the new SBT algorithm is also suitable for complex and even moving solid boundaries. | LIU MouBin SHAO JiaRu CHANG JianZhong | 2012 | Science China(Technological Sciences)2012，55，1： | 29 |
| 3 | Smoothed particle hydrodynamics and its applications in fluid-structure interactions显示文摘In ocean engineering, the applications are usually related to a free surface which brings so many interesting physical phenomena(e.g. water waves, impacts, splashing jets, etc.). To model these complex free surface flows is a tough and challenging task for most computational fluid dynamics(CFD) solvers which work in the Eulerian framework. As a Lagrangian and meshless method, smoothed particle hydrodynamics(SPH) offers a convenient tracking for different complex boundaries and a straightforward satisfaction for different boundary conditions. Therefore SPH is robust in modeling complex hydrodynamic problems characterized by free surface boundaries, multiphase interfaces or material discontinuities. Along with the rapid development of the SPH theory, related numerical techniques and high-performance computing technologies, SPH has not only attracted much attention in the academic community, but also gradually gained wide applications in industrial circles. This paper is dedicated to a review of the recent developments of SPH method and its typical applications in fluid-structure interactions in ocean engineering. Different numerical techniques for improving numerical accuracy, satisfying different boundary conditions, improving computational efficiency, suppressing pressure fluctuations and preventing the tensile instability, etc., are introduced. In the numerical results, various typical fluid-structure interaction problems or multiphase problems in ocean engineering are described, modeled and validated. The prospective developments of SPH in ocean engineering are also discussed. | 张阿漫 孙鹏楠 明付仁 A.Colagrossi | 2017 | Journal of Hydrodynamics2017，29，2： | 29 |
| 4 | 潜射导弹出筒过程的三维非定常数值模拟研究显示文摘潜射导弹出筒过程的研究对其水弹道以及水下动载荷的计算具有重要的意义。本文采用多相流模型和动网格技术,求解非定常雷诺平均NS方程,对考虑潜艇平动影响的导弹冷弹射出筒过程进行了三维非定常数值模拟。三维数值模拟体现出筒口效应、发射气团现象等经典实验现象与实验符合较好,说明本文方法能够有效地揭示导弹出筒过程中多相流体间的相互作用以及相应的流体动力特性,通过分析这些现象中导弹所受冲击的形成机理,为工程应用提供有意义的参考。 | 张红军 陆宏志 裴胤 叶建 邹正平 | 2010 | 水动力学研究与进展(A辑)2010，25，3： | 25 |
| 5 | NUMERICAL SIMULATION OF EXTREME WAVE GENERATION USING VOF METHOD显示文摘Numerical simulations of extreme wave generation are carried out by using the Volume Of Fluid(VOF) method.Extreme waves are generated based on wave focusing in a 2-D numerical model.To validate the capability of the VOF-based model described in this article,the propagation of regular waves is computed and compared with the theoretical results.By adjusting the phases of wave components,extreme waves are formed at given time and given position in the computation.The numerical results are compared with theoretical solutions and experimental data.It is concluded that the present model based on the VOF technique can provide acceptably accurate numerical results to serve practical purposes. | ZHAO Xi-zeng RIAM HU Chang-hong SUN Zhao-chen | 2010 | Journal of Hydrodynamics2010，22，4： | 21 |
| 6 | SIMULATION OF FLUID-SOLID INTERACTION ON WATER DITCHING OF AN AIRPLANE BY ALE METHOD显示文摘Ditching is considered as one of the important aspects of safety performances of airplanes.It is related primarily with the fluid-solid interaction,whose studies mainly depend on experiments at the present time.Numerical and analytical methods for fluid-solid interaction by using 3-D full scale airplane's model will reduce the dependence on the expensive model tests.Numerical studies can be used to estimate the safety of ditching and provide a reference for the crashworthiness design.This article proposes a 3-D dynamical structural model after the real shape of an airplane and an Arbitrary Lagrange-Euler (ALE) fluid-field model,to simulate the fluid-solid interactions caused by low speed ditching.The simulation is based on interaction computational methods,within LS-DYNA nonlinear finite-element code.The results of pressure distributions and accelerating time histories of the airplane's subfloor are discussed in the context of the safety of ditching,and the simulation results and the analytical methods are verified. | HUA Cheng FANG Chao CHENG Jin | 2011 | Journal of Hydrodynamics2011，23，5： | 20 |
| 7 | NUMERICAL SIMULATION AND EXPERIMENTAL STUDY OF DRAGREDUCING SURFACE OF A REAL SHARK SKIN显示文摘It is well known that shark skin surface can effectively inhabit the occurrence of turbulence and reduce the wall friction, but in order to understand the mechanism of drag reduction, one has to solve the problem of the turbulent flow on grooved-scale surface, and in that respect, the direct numerical simulation is an important tool. In this article, based on the real biological shark skin, the model of real shark skin is built through high-accurate scanning and data processing. The turbulent flow on a real shark skin is comprehensively simulated, and based on the simulation, the drag reduction mechanism is discussed. In addition, in order to validate the drag-reducing effect of shark skin surface, actual experiments were carried out in water tunnel, and the experimental results are approximately consistent with the numerical simulation. | ZHANG De-yuan LUO Yue-hao LI Xiang CHEN Hua-wei | 2011 | Journal of Hydrodynamics2011，23，2： | 17 |
| 8 | EXPERIMENTAL AND THEORETICAL STUDY ON THE HIGH-SPEED HORIZONTAL WATER ENTRY BEHAVIORS OF CYLINDRICAL PROJECTILES显示文摘In this article,the horizontal water-entry of flat-nose projectiles of two different lengths at impact velocities of 400 m/s-600 m/s is studied experimentally and theoretically.Based on the solution of the Rayleigh-Besant problem,a set of projectile dynamic equations are derived and a cavity model is built to describe the projectile's water entry dynamics.A parameter in the cavity model is determined by employing the principle of energy conservation.The results indicate that the flat-nose projectiles enjoy a good stability of trajectory,the drag coefficient and the velocity decay coefficient are dependent on the cavitation number,and increase along the penetration distance but with a relatively small variation.The maximum cavity radius decreases monotonically with the penetration distance.Projectiles with the same nose shapes at different initial velocities have a basically consistent cavity dimension before the deep pinching off phenomenon occurs.Good agreements are observed between results obtained by the analytical model and the experimental results. | GUO Zi-tao ZHANG Wei WANG Cong | 2012 | Journal of Hydrodynamics2012，24，2： | 14 |
| 9 | On the modeling of viscous incompressible flows with smoothed particle hydrodynamics显示文摘Smoothed particle hydrodynamics(SPH) is a Lagrangian, meshfree particle method and has been widely applied to different areas in engineering and science. Since its original extension to modeling free surface flows by Monaghan in 1994, SPH has been gradually developed into an attractive approach for modeling viscous incompressible fluid flows. This paper presents an overview on the recent progresses of SPH in modeling viscous incompressible flows in four major aspects which are closely related to the computational accuracy of SPH simulations. The advantages and disadvantages of different SPH particle approximation schemes, pressure field solution approaches, solid boundary treatment algorithms and particle adapting algorithms are described and analyzed. Some new perspectives and future trends in SPH modeling of viscous incompressible flows are discussed. | 刘谋斌 李上明 | 2016 | Journal of Hydrodynamics2016，28，5： | 12 |
| 10 | SPH统一算法对自由流体冲击弹性结构体问题模拟显示文摘对自由流体冲击弹性结构体涉及的自由界面运动、弹塑性变形、流固耦合作用等问题进行模拟时要求能有效计算介质运动变形与流固间耦合作用。利用光滑粒子流体动力学方法将流体、弹性体视为连续介质,用统一的N-S方程与虚拟压缩状态方程求解。基于初始粒子类型划分提出新的介质接触算法,通过在结构体表面增加结构体表面粒子,使流体与弹性体介质间相互作用实现稳定传递。计算结果表明,所用SPH统一算法与接触算法能准确有效模拟自由流体冲击弹性结构体变形回弹过程。 | 沈雁鸣 何琨 陈坚强 袁先旭 | 2015 | 振动与冲击2015，34，16： | 8 |
| 11 | 多相流动的光滑粒子流体动力学方法研究综述显示文摘光滑粒子流体动力学(smoothed particle hydrodynamics,SPH)具有粒子方法的无网格和全拉格朗日特征,适用于具有界面大变形、不连续性和多物理场的多相流的高精度模拟.SPH方法模拟多相流已有大量报道,具体的实现方式也大不相同.本文首先阐述了采用SPH方法模拟流体的基本控制方程,以及求解过程中需要考虑的流体压力求解、表面张力、固体边界等问题.整理和总结了基于SPH方法进行多相流模拟的主要实现方式:(1)双流体模型的拉格朗日求解器:两相离散为两组独立SPH粒子,并用显式相间作用耦合两相;(2)多相SPH方法:SPH方法对多相流模拟的自然延伸,相间作用由SPH参数隐式描述;(3)SPH与其他离散方法的耦合:差异较大的两相各自采用不同离散方法,发挥不同拉格朗日方法的优点;(4)SPH和基于网格方法的耦合:网格方法处理简单的单相流动主体,获得精度和效率间的平衡.另外,还在模拟参数物理化等方面论述了与SPH方法模拟多相流相关的一些改进和修正方法,并在最后讨论和建议了提高多相流SPH模拟效率和精度的措施. | 陈飞国 葛蔚 | 2021 | 力学学报2021，53，9： | 8 |
| 12 | 孤立波浅化过程的SPH数值模拟显示文摘本文应用光滑粒子流体动力学(SPH)方法建立了二维数值波浪水槽,研究了孤立波沿斜坡的传播、变形和破碎过程。通过数值计算分析了波浪沿斜坡传播过程中自由表面的变化特征,给出了斜坡上不同位置处波面变化的历时曲线,并应用文献记录的试验结果对数模结果进行了验证。得到了波高的沿程变化趋势、破波点的位置和破碎波高以及不同破碎形态下波浪自由表面的变化特征,显示了SPH方法在处理较复杂自由表面流动问题方面的优越性。 | 高睿 任冰 王国玉 王永学 | 2010 | 水动力学研究与进展(A辑)2010，25，5： | 8 |
| 13 | Numerical simulation of hydro-elastic problems with smoothed particle hydrodynamics method显示文摘Violent free surface flows with strong fluid-solid interactions can produce a tremendous pressure load on structures,resulting in elastic and even plastic deformations.Modeling hydro-elastic problems with structure deformations and a free surface breakup is difficult by using routine numerical methods.This paper presents an improved Smoothed Particle Hydrodynamics(SPH)method for modeling hydro-elastic problems.The fluid particles are used to model the free surface flows governed by Navier-Stokes equations,and the solid particles are used to model the dynamic movement and deformation of the elastic solid objects.The improved SPH method employs a Kernel Gradient Correction(KGC)technique to improve the computational accuracy and a Fluid-Solid Interface Treatment(FSIT)algorithm with the interface fluid and solid particles being treated as the virtual particles against their counterparts and a soft repulsive force to prevent the penetration and a corrective density approximation scheme to remove the numerical oscillations.Three typical numerical examples are simulated,including a head-on collision of two rubber rings,the dam break with an elastic gate and the water impact onto a forefront elastic plate.The obtained SPH results agree well with experimental observations and numerical results from other sources. | 刘谋斌 邵家儒 李慧琦 | 2013 | Journal of Hydrodynamics2013，25，5： | 7 |
| 14 | 变光滑长度SPH方法在入水冲击中的应用研究显示文摘计算效率低一直以来都是SPH方法(光滑粒子流体动力学方法)发展过程中面临的技术难题,而变光滑长度SPH方法既可以提高粒子非均匀分布时核函数计算精度,又能保证邻近粒子相互作用的对称匹配,因此对提高计算效率十分有益。本文采用空间变光滑长度SPH方法,并提出了一种新型的高效、高鲁棒性搜索方法,即平衡型树形搜索法(balanced alternative digital tree search algorithm,B-ADT),开展了二维楔形体入水冲击问题的应用研究,模拟结果显示文中所采用的空间变光滑长度SPH方法和平衡型树形搜索法,在保证计算精度的情况下,可以有效提高计算效率,这为下一步开展复杂工程应用打下重要基础。 | 沈雁鸣 施文奎 陈坚强 何琨 | 2020 | 船舶力学2020，24，3： | 5 |
| 15 | Two-phase SPH simulation of vertical water entry of a two-dimensional structure显示文摘In view of the fact that the SPH model is easy to handle the flows with the free surface of large deformation, a 2-D flow induced by vertical water entry of a 2-D structure is simulated using the two-phase SPH model. The local pressure of the boundary particles is obtained by pressure of the fluid particles nearby through a modified kernel approximation. To evaluate the accuracy of the method, water entry of a 2-D symmetric wedge with fixed separation point of the free surface on the wedge surface is simulated. The pressure distribution of the wedge at the initial stage agrees well with the analytical results available. Evolution of the free surface and the air flow in the cavity induced by the water entry are obtained. A higher speed air jet is found at the neck of the cavity when the neck of the cavity becomes smaller. For the case of a horizontal cylinder entering the water with an unknown separation point of flow on the model surface, the early stage of the water entry is simulated for the rigid body with different density. Evolution of the free surface deformation of the half-buoyant cylinder and neutrally buoyant cylinder water entry is compared with the experimental data. The effects of the density ratio and Froude number on the pinch-off of the cavity are discussed. It is found that the pinch-off time remains almost constant for different density ratio and Froude number. Meanwhile, for a given Froude number, the dimensionless pinch-off depth and the location of the cylinder at the time of pinch-off increase with the density ratio. Further, for a given density ratio, these two parameters increase with the Froude number and, however, the relative cavity shape appears to be a self-similar shape when Fr ?8.35. | 马林 赵曦 刘桦 | 2018 | Journal of Hydrodynamics2018，30，5： | 5 |
| 16 | NUMERICAL WAVE FLUME WITH IMPROVED SMOOTHED PARTICLE HYDRODYNAMICS显示文摘This paper presents an improved Nearest Neighboring Particle Searching(NNPS) technique for numerical modeling of water waves with the Smoothed Particle Hydrodynamics(SPH) method.The proposed technique differs from others by introducing the concept of Inner and Outer Particle Searching(IOPS) and shifting most of advanced CPU operations into simple addition operations.The IOPS method is shown to significantly improve the computational efficiency and reduce the CPU time especially for large number of particles,based on comparisons with other two NNPS methods.This method is implemented in a 2DV numerical wave flume conducted by the SPH method.Three test cases are examined,including generations and propagations of dam-breaking induced waves,solitary wave and irregular wave.Calculated results are in good agreements with experimental data and theoretical solutions with fairly satisfactory CPU time-consuming.The wave motions observed in physical facilities are successfully reproduced by the SPH numerical wave flume,revealing its robust capability of modeling realistic wave propagation and substantial potential for a wide variety of hydrodynamic problems. | ZHENG Jin-hai SOE Mee Mee ZHANG Chi HSU Tai-Wen | 2010 | Journal of Hydrodynamics2010，22，6： | 5 |
| 17 | 基于ALE方法的平底结构入水冲击动力特性研究显示文摘结构冲击入水作为一种典型的流固耦合问题广泛存在于船舶与海洋工程领域,特别是作为海洋平台简化模型的平底结构有着重要的工程应用背景和学术研究价值。本文采用ALE算法对二维弹性平底结构等速冲击入水过程进行数值模拟和分析,分别采用Lagrange单元和Euler单元来表征结构和流体,并通过耦合算法实现对流固耦合过程的模拟,分别讨论不同质量、刚度及入水速度情况下空气垫现象对结构底部压力的影响。计算结果表明,平底结构入水冲击过程中,底部边缘处压力最先达到峰值,随后沿宽度方向向中心依次出现压力峰值,且结构等速冲击入水后的运动为自由振动。冲击压力的峰值随结构质量及刚度的增大而增大,同时冲击压力峰值与速度呈线性关系,随速度的增大而增大,底部斜升角对冲击压力峰值的影响十分显著。通过上述研究为工程应用中的结构强度设计提供重要依据。 | 杨力 周勇 李华峰 王康 张咏鸥 刘土光 | 2017 | 舰船科学技术2017，39，12： | 4 |
| 18 | TRACKING METHODS FOR FREE SURFACE AND SIMULATION OF A LIQUID DROPLET IMPACTING ON A SOLID SURFACE BASED ON SPH显示文摘With some popular tracking methods for free surface, simulations of several typical examples are carried out under various flow field conditions.The results show that the Smoothed Particle Hydrodynamics (SPH) method is very suitable in simulating the flow problems with a free surface.A viscous liquid droplet with an initial velocity impacting on a solid surface is simulated based on the SPH method, and the surface tension is considered by searching the free surface particles, the initial impact effect is considered by using the artificial viscosity method, boundary virtual particles and image virtual particles are introduced to deal with the boundary problem, and the boundary defect can be identified quite well.The comparisons of simulated results and experimental photographs show that the SPH method can not only exactly simulate the spreading process and the rebound process of a liquid droplet impacting on a solid surface but also accurately track the free surface particles, simulate the free-surface flow and determine the shape of the free surface due to its particle nature. | LI Da-ming XU Ya-nan LI Ling-ling LU Hui-jiao BAI Ling | 2011 | Journal of Hydrodynamics2011，23，4： | 4 |
| 19 | 艏外飘型船体入水砰击的二维SPH模拟显示文摘砰击现象会导致船体局部结构受损或者会引起船体振动甚至折断,因此准确地预报船舶受到的砰击压力是水动力学研究的前沿课题之一。该文采用光滑质点水动力学方法(SPH方法)模拟具有代表性的二维外飘型船体物体入水问题,给出了艏外飘型船体的入水砰击的数值模拟结果。经与现有的实验与边界元方法计算结果比较,结果表明在低速、剖面曲率变化较小的情况下,单相SPH方法可有效地模拟二维外飘型船体入水砰击过程。船体表面压力时间过程线和入水阻力时间过程线反映了入水砰击过程中自由表面大变形和流动形成过程的水动力学效应。并给出了在一定弗劳德数范围内,不同测点处最大压力系数与剖面受到的垂向力的最大阻力系数的变化规律。 | 胥飞 刘桦 | 2013 | 水动力学研究与进展(A辑)2013，28，5： | 4 |
| 20 | 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 |
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