Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Aplicação de Elementos Finitos na Ortodontia

T. O. Bassani [1], T. Bassani [2], A. Andriguetto [1], F. Schneider [2],
[1] Instituto Latino Americano de Pesquisa e Ensino Odontológico - ILAPEO, Curitiba, PR, Brasil
[2] Universidade Tecnológica Federal do Paraná – UTFPR, Curitiba, PR, Brasil

O presente estudo visou a avaliação, por meio do método dos elementos finitos, das tensões geradas em um arco ortodôntico chamado de Arco de Retração Dupla Chave, também conhecido como DKL. Para isso foram modeladas as geometrias do arco DKL, dos bráquets e das coroas dentais, no software COMSOL Multiphysics®. O modelo criado tem como objetivo a substituição dos métodos tradicionais de ...

基于外部材料接口的循环塑性本构模型二次开发

蒋帆 [1],
[1] 华中科技大学电气与电子工程学院,武汉,中国

目前的商用有限元软件中,描述导体材料多采用为双线性或者多线性硬化的本构模型,而如纯铜、铜铌合金等材料均在疲劳加载过程中展现出了明显的棘轮效应等循环变形特征。线性硬化模型最大的一个缺陷是不能反映材料的循环硬化/软化、棘轮行为等循环变形特征;相反,非线性硬化模型能对导体材料的循环变形特征行为更为合理的模拟。另外,商用软件存在两方面不可避免的问题,一是非线性随动硬化模型发展迅速,商用软件内嵌的模型不能及时更新至目前更为合理的循环塑性模型,二是不能通过定义损伤变量来对材料损伤造成的材料承载能力的下降进行描述。解决以上问题,可利用商业软件提供的材料二次开发接口,通过编写二次开发子程序来实现用户所需的本构模型或功能。 在金属材料的循环塑性本构模型中,以 Armstrong-Frederick 随动硬化模型为基础进行修改和改进的非线性随动硬化模型得到了更为广泛的发展和应用,具有代表性的有 ...

电极压缩程度对钒液流电池性能的影响

王琼 [1], 屈治国 [1],
[1] 西安交通大学,西安,中国

引言 钒液流电池储能技术作为高效电化学储能技术之一,可应用于新能源储能,电网削峰填谷、调频调幅、应急电源等。钒液流电池储能技术具有独立的的额定功率和额定能量,高输出功率,低成本等特点[1]。 COMSOL Multiphysics® 的使用 本文采用分区建模,模型耦合的方式进行模拟。 结果 钒液流电池在组装过程中需要一定的组装压力以避免电解液的泄漏,同时可减小电极与集流板的接触电阻[2]。如图1所示,有研究表明有流道的集流板与石墨毡电极接触并挤压时,由于流道脊与流道的不均匀表面,会使石墨毡电极出现非均匀压缩现象[3]。图2为均匀模型(SU-5)与非均匀模型(SNI-5)电池压降与实验结果(Exp-5)在CR=55.67%的对比。结果显示考虑了石墨非均匀压缩导致的变形之后的模拟结果与实验结果相吻合。图3为非均匀模型与均匀模型在CR=41.83%情况下的对比图。如图所示 ...

Simulation of the Shape of Micro Geometries Generated with Jet Electrochemical Machining

M. Hackert[1], G. Meichsner[2], and A. Schubert[1,2]
[1]Micromanufacturing Technology, Chemnitz University of Technology, Chemnitz, Germany
[2]Fraunhofer Institute of Machine Tools and Forming Technology, Chemnitz, Germany

Electrochemical Machining with a closed electrolytic free jet is a special procedure to generate complex micro structures by help of anodic dissolution. The work piece shape is fabricated by supplying an electrolytic current through an electrolyte jet ejected from a small nozzle. In this study COMSOL Multiphysics is used to simulate the electric current density in the jet and the dissolution ...

Numerical Analysis of the Impact of Geometric Shape Patterns on the Performance of Miniaturized Chromatography Systems

R. Winz[1], E. von Lieres[2], and W. Wiechert[1]
[1]Department of Simulation, University of Siegen, Siegen, Germany
[2]Institute of Biotechnology, Research Centre Jülich, Siegen, Germany

We have implemented a two dimensional chromatography model for the analysis and optimization of structured micro pillar arrays. Dynamic surface interaction of solved molecules is taken into account by the kinetic Langmuir model. Variations of the pillar array geometry lead to deviations in the outlet concentration profiles. These deviations cannot be described by the one dimensional models that ...

Magnetic Particle Buildup Growth on Single Wire in High Gradient Magnetic Separation  

F. Chen
Department of Chemical Engineering, M.I.T., Cambridge, MA, USA

Magnetic fluids containing nano or submicron magnetic particles and their application in food, biological and pharmaceutical systems have recently attracted increasing attention. Magnetic particles can be collected efficiently in magnetizable matrices (e.g. iron wires) in high gradient magnetic separation (HGMS) process. In this work, the dynamic buildup growth process is treated as a moving ...

Coupled Models of Lithospheric Flexure and Magma Chamber Pressurization at Large Volcanoes on Venus

G. Galgana[1], P. McGovern[2], and E. Grosfils[2]

[1]Lunar and Planetary Institute, Houston, Texas, USA
[2]Pomona College, Claremont, California, USA

We present an implementation of the Structural Mechanics module of COMSOL Multiphysics to model the state of stress associated with the emplacement of large volcanic edifices on the surface of a planet. These finite element models capture two essential physical processes: (1) Elastic flexure of the lithosphere beneath the edifice load, and (2) Pressurization of a magma-filled chamber that serves ...

Numerical and Experimental Study of Flow, Heat Transfer and Concentration in a Scaled-up Fuel Cell Anode Channel Model

J. C. Torchia-Nüñez[1], and J.G. Cervantes-de-Gortari[1]

[1]Department of Thermal Engineering, National University of Mexico, UNAM, Mexico City, Mexico

Flow, concentration and temperature fields are studied with numerical and experimental methods inside a scaled-up fuel cell anode channel model. The low aspect ratio channel has a porous medium as the inferior wall where a mixing of different pH solutions occurs. Chromatic change of phenolphthalein is used to visualize concentration field and Particle Image Velocimetry (PIV) is used to visualize ...

Large Scale 3D Flow Distribution Analysis in HTPEM Fuel Cells

C. Siegel[1][2], G. Bandlamudi[1][2], N. van der Schoot[1], and A. Heinzel[1][2]
[1]Zentrum für BrennstoffzellenTechnik GmbH, Duisburg, Germany
[2]Institut für Energie- und Umweltverfahrenstechnik, University of Duisburg-Essen, Duisburg, Germany

Accurate bipolar-plate and flow-field layout is one crucial task for optimizing fuel cells. These cell components perform several functions, including charge transport or gas and water transport throughout the cell just to name a few. Overall, the design depends on the fuel cell application or the geometrical size of the assembly. The requirements for a flow-field used in a high temperature ...

Image-Based Simulation of Electrical Impedance Techniques Applied on the Human Thorax for Cardio-Pulmonary Applications

F.K. Hermans[1], R.M. Heethaar[1], R.T. Cotton[2], and A. Harkara[2]


[1]VU University Medical Center, Amsterdam, The Netherlands
[2]Simpleware Ltd., Exeter, United Kingdom

For medical diagnostic purposes there is an increasing need for non- (or minimal) invasive techniques to measure all kinds of parameters that can provide insight in the functioning of cells, organs or organ systems. Currently, Impedance Cardiography (ICG) is used for measurements of the heart and Electric Impedance Tomography (EIT) is used for investigating lung tissue condition. This paper ...