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Modelling incompressible flows and fluid-structure interaction problems with smoothed particle hydrodynamics:Briefing on the 2017 SPHERIC Beijing International Workshop

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Journal of Hydrodynamics 2018年第1期30卷 34-37页

作者：刘谋斌黄灿张阿漫 BIC-ESAT College of EngineeringPeking University Ocean Engineering Zhejiang University College of Shipbuilding Engineering Harbin Engineering University

The 2017 SPHERIC Beijing International Workshop（or SPHERIC Beijing 2017） was held at Peking University, in China,on October 17-20, 2017. This is the first time that the SPHERIC Workshop was held out of Europe. We are delighted to present nine contributions in this Special Column of the Journal of Hydrodynamics, and take this opportunity to announce that the 13 th SPHERIC Workshop（or SPHERIC 2018） will be held in Galway, Ireland in 2018 by the National University of Ireland, and the SPHERIC International Workshop in Harbin, China in 2019 by the Harbin Engineering University.

关键词： Smoothed particle hydrodynamic（SPH） SPHERIC free surface flows meshfree methods particle method

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A meshfree ES-PIM for nonlinear transient heat transfer

A meshfree ES-PIM for nonlinear transient heat transfer

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第三届亚太国际工程中计算方法学术会议ICOME2009...

作者： S. C. Wu a b * G. R. Liub c W. L. Chena X. Y. Cuib d aCentre for Advanced Materials Joining & Computations (AMJC) School of Materials Science and Engineering Hefei University of Technology Hefei 230009 PR China bCentre for Advanced Computations in Engineering Science (ACES) Department of Mechanical Engineering National University of Singapore 117576 Singapore cSingapore-MIT Alliance (SMA) E4-04-10 4 Engineering Drive 3 117576 Singapore dState Key Laboratory of Advanced Technology for Vehicle Body Design & Manufacture Hunan University Changsha 410082 PR China

A meshfree edge-based smoothed point interpolation methods （ES-PIM） is formulated to analyze the nonlinear heat transfer problems in two-dimensions. The nonlinearities arising from the variation of material properties and surface convection coefficients and those due to the inclusion of the radiation effects are fully considered. The PIM is used to approximate the temperature function and the thermal gradient field within edge-based smoothed domains is modified by a generalized gradient smoothing technique. To avoid iterations, quasilinearization scheme is adopted to linearize the nonlinear system equations, and for time integration the Euler backward method is used, as its unconditional stability allows for larger time steps. The smoothed incremental heat transfer equilibrium equations are then established using the generalized smoothed Galerkin weak form. A number of one- and two-dimensional heat transfer problems are studied in terms of the convergence in equivalent energy and the accuracy of temperature field. It is found that present ES-PIM achieves more accurate temperature results and better convergence than FEM and NS-PIM do using the same triangular background meshes and can effectively simulate complex nonlinear heat transfer problems.

关键词： meshfree methods Nonlinear transient heat transfer Convection Radiation Gradient smoothing technique Element-free Galerkin method.

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Topology Optimization of Nonlinear Structures with Multiple Materials using meshfree Method and Level Set Method

Topology Optimization of Nonlinear Structures with Multiple ...

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The Fourth China-Japan-Korea Joint symposium on Optimization of Structural and Mechanical Systems

作者： Hirohisa NOGUCHI Department of System Design and Engineering Keio University 3-14-1 HiyoshiKohoku-ku

＜正＞An enhanced meshfree methods combined with level set method are employed to solve the topology optimization problems of nonlinear structures made of multiple materials under large deformations. Moving Least Square Approximation （MLSA） with discontinuous derivatives basis function is used in order to treat the moving material interface represented by level set method during the procedures of topology optimization. The enhanced MLSA formulation provides meshfree methods with the ability to handle the material discontinuity at the material interface accurately and efficiently, which can accurately and automatically solve the stress discontinuities around moving material interfaces. The numerical results show the success and accuracy of the present method by solving several 2-D topology optimization problems, involving single material structures and multiple materials structures, especially the structures made of nearly incompressible rubber-like materials undergoing large deformations.

关键词： Topology Optimization meshfree methods Material Discontinuity Level Set

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