Technical Papers and Presentations

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.

Accuracy Tests for COMSOL - and Delaunay Meshes

E. Holzbecher, and Hang Si
Weierstrass Institute for Applied Analysis and Stochastics (WIAS), Berlin, Germany

In the paper we examine the accuracy of various meshes for different model regions and simple differential equations in 2D and in 3D. We study the potential equation for a single irregular domain (2D testcase 1), for a simple domain with irregular sub-domains (2D testcase 2) and a 3D testcase. For testcase 1 we compare with the analytical solution, for testcases 2 with the best solution, obtained ...

Thermal and Material Flow Modelling of Friction Stir Welding Using COMSOL

H. Schmidt[1,2], and J. Hattel[1]
[1]Technical University of Denmark, Kgs. Lyngby, Denmark
[2]HBS Engineering, Frederiksberg, Denmark

Two friction stir welding models are presented – a global thermal model using the temperature dependent heat source and a local material flow and heat generation model allowing for detailed investigation of different contact conditions. The two models are coupled into a larger local-global model. The flow model includes frictional dissipation from the contact between the work piece and the ...

Calculation of Cable Parameters for Different Cable Shapes 

H. Lorenzen[1], J. Timmerberg[1], and S. Mylvaganam[2]
[1]Department of Electrical Engineering, UAS OOW, Wilhelmshaven, Germany
[2]Department Technology/Engineering, Telemark University College, Porsgrunn, Norway

Efforts involving simulation of  transmission line networks necessitate the accurate values of the parameters of the lines. In this paper, as an attempt in estimating such parameters, the parameters of high voltage asymmetric power lines are calculated. In the process of estimation, the three phase equivalent circuit model is used. The resistance and inductance of such lines are dependent on ...

Advanced Modeling of Friction Stir Welding – Improved Material Model for Aluminum Alloys and Modeling of Different Materials with Different Properties by Using the Level Set Method

S. Dörfler
Wilhelm Gronbach GmbH, Wasserburg a. Inn, Germany

Friction Stir Welding (FSW) has gained much importance throughout the last years. Beside comprehensive experimental work that has been carried out, the simulation of the welding zone is of major interest.  Due to the high strains observed within the welding zone, the Eulerian (CFD) approach seems to be the most promising for the prediction of flow around the FSW tool. However, the CFD ...

Vertically Emitting Microdisk Lasers

L. Mahler, A. Tredicucci, and F. Beltram
NEST-INFM and Scuola Normale Superiore, Pisa, Italy

We describe the modeling of microdisk lasers displaying vertical emission. The devices are THz quantum cascade lasers with metallic gratings fabricated along the circumference.  The emission properties of the fabricated devices are well explained by the model, good mode control is obtained, and the collected power from a patterned device is increased 50 times with respect to unpatterned ...

Modeling Polybenzimidazole/Phosphoric Acid Membrane Behaviour in a HTPEM Fuel Cell

C. Siegel[1,2], G. Bandlamudi[1,2], and A. Heinzel[1,2]
[1]Zentrum für BrennstoffzellenTechnik (ZBT) gGmbH, Duisburg, Germany
[2]Institut für Energie- und Umweltverfahrenstechnik, University of Duisburg-Essen, Duisburg, Germany

Phosphoric acid doped polybenzimidazole (PBI) membranes are commonly used in today’s high-temperature polymer-electrolyte-membrane (HTPEM) fuel cell technology. COMSOL Multiphysics is used to model and simulate the three-dimensional, single-phase, non-isothermal overall cell behaviour at different operating points. The sol-gel PBI/H3PO4 membrane behaviour is modeled using an Arrhenius ...

Thermo-Hydro-Mechanical-Chemical Modelling of the Bentonite Barriers in Final Disposal of High Level Nuclear Waste

M. Olin, M. Tanhua-Tyrkkö, V. Pulkkanen, A. Itälä, K. Rasilainen, A. Seppälä, and M. Liukkonen
VTT Technical Research Centre of Finland, Nuclear Energy, Finland

The bentonite barrier is an essential part of safe nuclear waste repository in granite bedrock. In this work COMSOL Multiphysics® is applied to modeling Thermo-Hydro-Mechanical-Chemical (THMC) processes taking place in a bentonite buffer. The system is studied in different geometries, which consists of an overall 3D layout and a 2D cross-section of bentonite buffer and open fracture. ...

Determination of Process Parameters for Electron Beam Sintering (EBS)

M. F. Zäh, S. Lutzmann, M. Kahnert, and F. Walchshäusl
iwb Anwenderzentrum Augsburg, TU München, Augsburg, Germany

Additive Layer Manufacturing (ALM) methods, like Electron Beam Sintering (EBS), constitute an interesting process concerning the production of small series and customized products. However, transient effects occur during processing due to the different physical principles of an electron beam (EB). Thus, process knowledge from similar ALM technologies, for instance Selective Laser Melting, can ...

Modeling of a Dielectric Barrier Discharge Lamp for UV Production

S. Bhosle, R. Diez, H. Piquet, D. Le Thanh, B. Rahmani, D. Buso
Université de Toulouse, Toulouse, France

Excilamps are artificial Ultraviolet sources based on the emission of excimers or exciplexes. The latter are excited states of weakly bound rare gas or halide/rare gas atoms which emit a photon in the UV region when they dissociate. Dielectric Barrier Discharge (DBD) excilamps are promising UV sources for the future, provided the coupling between their power supply is optimized. The model ...

Thermal and Fluid-dynamical Optimisation of Passengers Comfort in a Touring Bus Cabin

G. Petrone[1], G. Fichera[2], and M. Scionti[1]
[1]Bus-Engineering S.r.l., Catania, Italy
[2]Department of Industrial and Mechanical Engineering, University of Catania, Catania, Italy

Innovations in air-conditioning and other forms of cooling or ventilation can be viewed as technological solutions improving environmental conditions that are beneficial for human health, comfort and productivity. This study deals with a thermal and fluid-dynamics investigation of passenger comfort in a touring bus cabin. COMSOL Multiphysics® is used as a powerful design and optimization tool ...

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