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Smoothed particle hydrodynamics(SPH) for modeling fluid-structure interactions

Science China(Physics,Mechanics & Astronomy) 2019年第8期62卷 1-38页

作者： moubin liu Zhilang Zhang BIC-ESAT College of Engineering Peking University State Key Laboratory for Turbulence and Complex Systems Peking University Institute of Ocean Research Peking University

Fluid-structure interaction(FSI) is a class of mechanics-related problems with mutual dependence between the fluid and structure parts and it is observable nearly everywhere, in natural phenomena to many engineering systems. The primary challenges in developing numerical models with conventional grid-based methods are the inherent nonlinearity and timedependent nature of FSI, together with possible large deformations and moving interfaces. Smoothed particle hydrodynamics(SPH) method is a truly Lagrangian and meshfree particle method that conveniently treats large deformations and naturally captures rapidly moving interfaces and free surfaces. Since its invention, the SPH method has been widely applied to study different problems in engineering and sciences, including FSI problems. This article presents a review of the recent developments in SPH based modeling techniques for solving FSI-related problems. The basic concepts of SPH along with conventional and higher order particle approximation schemes are first introduced. Then, the implementation of FSI in a pure SPH framework and the hybrid approaches of SPH with other grid-based or particle-based methods are discussed. The SPH models of FSI problems with rigid, elastic and flexible structures, with granular materials, and with extremely intensive loadings are demonstrated. Some discussions on several key techniques in SPH including the balance of accuracy, stability and efficiency, the treatment of material interface, the coupling of SPH with other methods, and the particle regularization and adaptive particle resolution are provided as concluding marks.

关键词： smoothed particle hydrodynamics(SPH) fluid-structure interaction(FSI) computational fluid dynamics(CFD) computational solid dynamics(CSD)

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Numerical modeling of oil spill containment by boom using SPH

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Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 315-321页

作者： YANG XiuFeng liu moubin Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of Sciences

The ocean environment is protected from oil pollution usually by using floating booms,which involves water-oil two-phase flow and strong fluid-structure *** this paper,a modified multi-phase smoothed particle hydrodynamics(SPH) method is proposed to model oil spill containment by using a moving *** major influencing factors including oil type,moving velocity and skirt angle of the boom,and water wave are *** SPH simulation results demonstrate different typical boom failure modes found in laboratory *** is shown that the ability of a boom in containing oil is not only affected by its own characteristics,but also closely related to external environmental *** is found that boom failure is more likely to happen for heavy oil,high boom velocity,negative skirt angle,and/or in the presence of water waves.

关键词： smoothed particle hydrodynamics oil spill boom multi-phase flow

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Multi-resolution technique integrated with smoothed particle element method (SPEM) for modeling fluid-structure interaction problems with free surfaces

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Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 41-62页

作者： Ting Long Zhilang Zhang moubin liu Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT) College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering SciencePeking UniversityBeijing 100871China Institute of Ocean Research Peking UniversityBeijing 100871China School of Mechanical Engineering Guangxi UniversityNanning 530004China

Free-surface flows, especially those associated with fluid-structure interactions(FSIs), pose challenging problems in numerical simulations. The authors of this work recently developed a smoothed particle element method(SPEM) to simulate FSIs. In this method, both the fluid and solid regions are initially modeled using a smoothed finite element method(S-FEM) in a Lagrangian frame, whereas the fluid regions undergoing large deformations are adaptively converted into particles and modeled with an improved smoothed particle hydrodynamics(SPH) method. This approach greatly improves computational accuracy and efficiency because of the advantages of the S-FEM in efficiently treating solid/fluid regions showing small deformations and the SPH method in effectively modeling moving interfaces. In this work, we further enhance the efficiency of the SPEM while effectively capturing local fluid information by introducing a multi-resolution technique to the SPEM and developing an effective approach to treat multi-resolution element-particle interfaces. Various numerical examples demonstrate that the multiresolution SPEM can significantly reduce the computational cost relative to the original version with a constant ***, the novel approach is effective in modeling various incompressible flow problems involving FSIs.

关键词： smoothed particle element method(SPEM) smoothed finite element method(S-FEM) smoothed particle hydrodynamics(SPH) multi-resolution technique fluid-structure interaction

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On the treatment of solid boundary in smoothed particle hydrodynamics

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Science China(Technological Sciences) 2012年第1期55卷 244-254页

作者： liu moubin SHAO JiaRu CHANG JianZhong Key Laboratory for Hydrodynamics and Ocean Engineering Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China State Key Laboratory for Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China School of Mechatronic Engineering North University of China Taiyuan 030051 China

As a popular meshfree particle method,the smoothed particle hydrodynamics(SPH) has suffered from not being able to di-rectly implement the solid boundary *** influences the SPH approximation accuracy and hinders its further de-velopment and application to engineering and scientific *** this paper,a coupled dynamic solid boundary treatment(SBT) algorithm has been proposed,after investigating the features of existing SPH SBT *** 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 *** 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 *** 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.

关键词： smoothed particle hydrodynamics (SPH) particle method solid boundary treatment (SBT) coupled dynamic SBT

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3D large-scale SPH modeling of vehicle wading with GPU acceleration

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Science China(Physics,Mechanics & Astronomy) 2023年第10期66卷 70-91页

作者： Huashan Zhang Xiaoxiao Li Kewei Feng moubin liu College of Engineering Peking UniversityBejing 100871China Joint Laboratory of Marine Hydrodynamics and Ocean Engineering Laoshan LaboratoryQingdao 266237China Nanchang Innovation Institute Peking UniversityNanchang 330008China Shenzhen TenFong Technology Co.Ltd. Shenzhen 518055China

Vehicle wading is a complex fluid-structure interaction(FSI) problem and has attracted great attention recently from the automotive industry, especially for electric vehicles. As a meshless Lagrangian particle method, smoothed particle hydrodynamics(SPH) is one of the most suitable candidates for simulations of vehicle wading due to its inherent advantages in modeling free surface flows, splash, and moving interfaces. Nevertheless, the inevitable neighbor query for the nearest adjacent particles among the support domain leads to considerable computational cost and thus limits its application in 3D large-scale simulations. In this work, a GPU-based SPH method is developed with an adaptive spatial sort technology for simulations of vehicle wading. In addition, a fast, easy-to-implement particle generator is presented for isotropic initialization of the complex vehicle geometry with optimal interpolation properties. A comparative study of vehicle wading on a puddle between the GPUbased SPH with two pieces of commercial software is used to verify the capability of the GPU-based SPH method in terms of convergence analysis, kinematic characteristics, and computing performance. Finally, different conditions of vehicle speeds, water depths, and puddle widths are tested to investigate the vehicle wading numerically. The results demonstrate that the adaptive spatial sort technology can significantly improve the computing performance of the GPU-based SPH method and meanwhile promotes the GPU-based SPH method to be a competitive tool for the study of 3D large-scale FSI problems including vehicle wading. Some helpful findings of the critical vehicle speed, water depth as well as boundary wall effect are also reported in this work.

关键词： vehicle wading fluid-structure interaction GPU-based SPH adaptive spatial sort technology

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Dissipative particle dynamics simulation of flow through periodic arrays of circular micropillar

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Applied Mathematics and Mechanics(English Edition) 2016年第11期37卷 1431-1440页

作者： Luwen ZHOU Yuqian ZHANG Xiaolong DENG moubin liu Institute of Mechanics Chinese Academy of SciencesBeijing 100190China Cancer Institute and Hospital Chinese Academy of Medical SciencesBeiiing 100021China Beijing Computational Science Research Center Beijing 100084China College of Engineering Peking UaiversityBeijing 100871China

Flow through arrays of micropillar embedded inside microfluidic chip systems is important for various microfluidic devices. It is critical to accurately predict the mass flow rate through pillar arrays based on the pillar design. This work presents a dissipative particle dynamics （DPD） model to simulate a problem of flow across periodic arrays of circular micropillar and investigates the permeability of two types of micropillar arrays. The flow fields including horizontal and vertical velocity fields, the number density field, and the streamline of the flow are analyzed. The predicted solid volumes by the presented DPD simulation of both types of arrays are quite close to the actual counterparts. These quantitative agreements show usefulness and effectiveness of the DPD model in simulating arrays of micropillar. By comparing two types of micropillar arrangement patterns, we find that the arrangement pattern of micropillar does not have significant influence on the permeability of the array.

关键词： array of micropillar permeability dissipative particle dynamics (DPD)

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Formation of defects in selective laser melted Inconel 718 and its correlation with mechanical properties through dimensionless numbers

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 58-74页

作者： Zhiwei Luo Zekun Wang Zhenyu Yan Jing Chen Shuguang Li moubin liu Capital Aerospace Machinery Co.Ltd. Beijing 100706China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering SciencePeking UniversityBeijing 100871China College of Engineering Peking UniversityBeijing 100187China Nanchang Innovation Institute Peking UniversityNanchang 330008China

This paper presents a profound study on the formation of three typical types of defects(i.e.,lack of fusion,keyholes,and gas pores)observed in selective laser melting(SLM)printed Inconel 718 samples,along with their correlations with mechanical properties of the *** tomography,scanning electron microscopy,and mechanical property tests revealed that the three types of defects fall into three stages of porosity evolution classified by recently-proposed dimensionless numbersηm(melting efficiency)andηv(vaporization efficiency).Meanwhile,experimental tests verified that the mechanical properties of products,such as strength and elongation,are remarkably sensitive to lack of ***,these properties are slightly affected by the keyholes and gas *** optimal process window characterized by dimensionless numbers is realized by adjusting the processing parameters and employing different *** process window allows products to have relatively low defects and high mechanical performances.A quantitative relation between processing parameters,dimensionless numbers,defects,and mechanical properties is established based on these *** relation,along with the optimal process window,is believed to enhance the quality of SLM products of Inconel 718 alloy and can be further extended to SLM with other metal materials.

关键词： selective laser melting defects formation mechanical properties similarity criterion

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基于半解析VOF-DEM的激光直接沉积多尺度过程模拟

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力学学报 2021年第12期53卷 3228-3239页

作者：王泽坤刘谋斌北京大学工学院北京100871

与传统铸造技术相比,基于金属粉末的增材制造技术因其生产周期短、可操作性强而在航空航天、生物医学等领域具有很好的优越性.尤其是激光直接沉积技术,因其自由度高,在复杂构件制造、部件修复中有着广泛的运用.但是该激光直接沉积过程... 详细信息

与传统铸造技术相比,基于金属粉末的增材制造技术因其生产周期短、可操作性强而在航空航天、生物医学等领域具有很好的优越性.尤其是激光直接沉积技术,因其自由度高,在复杂构件制造、部件修复中有着广泛的运用.但是该激光直接沉积过程涉及多物理场、跨尺度、极端高温高压环境和相变问题,仅靠实验不能很好地研究其中的机理.已有数值模拟技术一般通过预设或者射入拉格朗日点作为颗粒输入,不能做到同时考虑环境气体、颗粒碰撞和相变过程.本文在近期发展的基于核函数近似背景流场的半解析CFD-DEM耦合方法中引入了流体体积分数法(VOF),发展了可以同时模拟含热、刚体颗粒、相变和自由液面及相变界面的半解析VOF-DEM(或半解析CFD-DEM-VOF)方法,从而首次实现了真实物理环境下激光直接沉积技术的数值模拟.其中,VOF中的气相为环境气体,液相为熔融和凝固的金属相,界面通过iso-Advector重构,DEM为未熔化的金属粉末,且流体网格可解析离散元颗粒形状.这一模拟框架可以有效复现颗粒之间的碰撞、粘结、熔化、融合,以及熔池熔道的形成,为激光直接沉积技术的数值模拟提供了开拓性的范式,并可以被应用到其他带相变的颗粒系统中.

关键词：激光直接沉积技术颗粒流动半解析CFD-DEM耦合数值模拟框架

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超疏水小球低速入水空泡研究

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力学学报 2019年第1期51卷 36-45页

作者：黄超翁翕刘谋斌北京大学工学院力学与工程科学系北京100871 北京大学海洋研究院北京100871

物体入水问题是一类复杂的流固耦合问题,具有广泛的工程应用背景.物体在跨越自由液面入水的过程中,在一定的条件下,会向水中卷入空气形成空泡,空泡的运动还可能形成指向物体的射流,从而对物体的受力及其运动过程产生影响.超疏水表面能... 详细信息

物体入水问题是一类复杂的流固耦合问题,具有广泛的工程应用背景.物体在跨越自由液面入水的过程中,在一定的条件下,会向水中卷入空气形成空泡,空泡的运动还可能形成指向物体的射流,从而对物体的受力及其运动过程产生影响.超疏水表面能够在物体入水过程中形成多尺度流固耦合作用,进而影响物体的运动和宏观流动现象.而对于小尺度的小球低速入水问题,表面和界面力往往起主导作用.为了在更广的参数空间获得超疏水小球入水空泡类型和小球的运动特性,采用高速摄影实验方法,研究了半径0.175～10 mm的超疏水小球低速入水及空泡动力学行为,获得了小球漂浮振荡、准静态空泡、浅闭合空泡、深闭合空泡和表面闭合空泡5种类型的动力学行为,探讨了这些运动行为与韦伯数We和邦德数Bo之间的关系,并推导了小球漂浮振荡与下沉现象的无量纲关系.研究结果表明:超疏水小球的入水及空泡动力学行为主要与韦伯数We和邦德数Bo有关.在邦德数Bo O(1)后,浅闭合现象也不再发生;小球漂浮振荡与下沉现象的临界关系可以用相似律关系描述.

关键词：入水超疏水流体动力学冲击空泡形态

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2017 SPHERIC Beijing International Workshop

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Journal of Hydrodynamics 2017年第2期29卷 376-376页

作者： liu moubin College of Engineering Peking University China

The 2017 SPHERIC Beij ing International Workshop （SPHERIC Beijing 2017） will be held at Peking University（PKU） in Beijing, China during 17-20 October 2017, and this is the first time that the SPHERIC Workshop is h... 详细信息

关键词： PKU SPHERIC Beijing International Workshop

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