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.

How Apps Can Support COMSOL Multiphysics® Users?

G. Petrone [1], C. Barbagallo [1],
[1] BE CAE & Test, Catania, Italy

Disposing of easy-to-use COMSOL Multiphysics® app to exploit FE-based simulations represents an important opportunity for people working in several industrial areas – from the electronics to the process engineering. In supplying consultancy services, Engineers at BE CAE & Test propose their Customers to use COMSOL Multiphysics® apps to run parametric models and carry-out predictive analyses ...

锂离子电池热失控研究

王兵 [1], 牛会朋,孙洁洁,纪常伟 [1],
[1] 北京工业大学

摘要: 锂离子电池热失控会对人造成极大的危害,如何避免这些热失控的发生成为了学者们主要的研究课题,为了对其进行研究,必须要从电池内部结构和机理入手去分析,需要从电化学原理到化学反应进行深入细致的分析,需要对锂离子电池的生热机理有全面的认识。采用仿真技术对锂离子电池失控研究,可以极大的减少研究成本,并对失控过程进行有效的预测。 COMSOL Multiphysics 软件的使用: 利用 COMSOL Multiphysics 中的传热模块以及 ODE 模块,建立锂离子电池三维热失控模型,分析其内部发生化学分解的全过程。 结果: 锂离子电池热失控过程中,材料分解反应程链式反应,随着温度的升高,反应速率加快,进而产生更多的热量,导致热量聚集而无法快速释放,最终引发电池的热失控。 结论: 通过控制温度可以有效的防止电池热失控的发生。

海底管线周围流场分析

叶智慧 [1], 宁禹强 [1], 陈冬 [1], 张佳亮 [1],
[1] 中国石油大学(北京)

海洋油气开采的过程中,油气在海底通过海底管线进行运输。当雷诺数改变时,海底管线周围的流场也会相应发生改变,因此研究管线周围流场分布对分析管线受力情况至关重要。本文研究了海底管道在层流和紊流的情况下,不同流速,不同的床面粗糙度以及不同位置海底管线等情况进行了建模和分析,绘制了不同情况下流场分布图。计算结果表明:(1)同一位置,不同流速下,海流绕流管线形成的流场不同,当流速超过某一限定值后,会出现涡流。(2)不同位置,相同速度下,海流绕流管线形成的流场有所不同。通过数值模拟,对不同情况下的管线受力情况有了清晰的认识,对工程实际操作可以起到指导作用。 关键词:海底管线;海流力;流型;数值模拟;

Simulation of Dielectric Barrier Discharge Lamp Coupled to the External Electrical Circuit

A. El-Deib[1], F. Dawson[1], S. Bhosle[2], D. Buso[2], and G. Zissis[2]
[1]University of Toronto, Toronto, Ontario, Canada
[2]LAPLACE-University of Toulouse, Toulouse, France

This work uses COMSOL to simulate the Dielectric Barrier Discharge (DBD) lamp coupled to the external electrical circuit. The coupled system is modeled to capture the effect of the electrical parasitic elements on the efficiency of the DBD which is more realistic as compared to previous trials which assumed that a perfect voltage source is applied to lamp terminals. The obtained results ...

CFD-based Evaluation of Drag Force on a Sphere Unsteadily Moving Perpendicularly toward a Solid Surface: a Simple Model of a Biological Spring, Vorticella Convallaria

S. Ryu[1], and P. Matsudaira[2]
[1]Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
[2]Department of Biology and Bioengineering, Massachusetts Institute of Technology, Cambridge, MA, USA

Vorticella convallaria, a sessile peritrich ciliate having a contractile stalk, is regarded as a model biological spring because of its remarkably fast contraction. Because the cell body shrinks to sphere-like shape during contractions, it can be assumed to be a sphere moving in quiescent water, and Vorticella’s contraction force has been evaluated with Stokes’ law. In this study, we ...

High Vacuum Gas Pumping and Boundary Coupling

M. Cavenago
INFN/LNL, Laboratori Nazionali di Legnaro, Legnaro, Italy

Many scientific instruments are based on high vacuum equipment with a gas pressure maintained in the order of 1 Pa or below. The gas flow in the low pressure limit, called the molecular flow regime, is a case of transport with zero viscosity. The ability to solve an integral equation on the boundary with finite elements methods allows us to find the gas densities and flows in the ...

Thermal Design of Power Electronic Devices and Modules

N. Delmonte[1], M. Bernardoni[1], P. Cova[1], and R. Menozzi[1]
[1]Dipartimento di Ingegneria dell’Informazione, University of Parma, Parma, Italy

This work describes a way to apply 3D Finite Element Analysis (FEA) to the thermal design of power electronic modules using simplified geometry models of the system components. The method here presented can overcome the problem of solving equation systems with a very high number of Degrees Of Freedom (DOF) due to complex geometry of a power module.

An Analysis of Skimboard Hydrodynamics

N.D. Barnett[1], and E. Gutirrez-Miravete[2]
[1]General Dynamics-Electric Boat, Kingston, Rhode Island, USA
[2]Rensselaer at Hartford, Hartford, Connecticut, USA

This paper report on a study of the hydrodynamics of skimboards and surfboards using the computational fluid dynamics (CFD) module in COMSOL. The study analyzes the flow in a thin water layer underneath a skim board in a 2-D Cartesian coordinate. Three different sets of boundary conditions were employed and one of them produced the best agreement with previous findings.

Energy Transformation Damping

G.S. Mulder[1]
[1]Leiden, The Netherlands

A model for material damping is presented in terms of internal friction and in terms of a variation of stiffness. In the latter case the idea is that the stiffness increases if elastic energy is stored and decreases if elastic energy is released. In case of a single mass spring system “stiffness” refers to the stiffness of the spring; in case of a continues object &ldquo ...

Thermo-fluid Dynamics Modelling of Hydrogen Absorption and Desorption in a LaNi4.8Al0.2 Hydride Bed

D. Baldissin[1] and D. Lombardo[1]
[1]Compumat S.r.l., Torino, Italy

A two-dimensional mathematical model for the absorption and desorption of H2 in LaNi4.8Al0.2 was developed and experimentally validated. The model is composed of an energy balance, a mass balance and a momentum balance. These differential equations are numerically solved by means of the finite element method using the software COMSOL Multiphysics®. From a comparison between theoretical ...