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.

S-parameter Sensitivity Analysis of Waveguide Structures with FEMLAB

Li, D., Nikolova, N.K.
Computational Electromagnetics Research Laboratory, Department of Electrical and Computer Engineering, McMaster University, Hamilton, Ontario

For the purpose of accurate and efficient design of a microwave structure, sophisticated optimization techniques are typically used. The optimization process can greatly benefit from the availability not only of the objective function, but also its gradient. Numerical electromagnetic solvers do not provide the gradient information, thus defaulting to the finite-difference approximation at the ...

Opto-Asic, Photonische Kristalle

Ricklefs, U., Luo, H.
FH Giessen-Friedberg, FB EI

Mit FEMLAB 2.x und 3.1 wurden Voruntersuchungen zu zwei Anwendungen versucht. Im ersten Projekt sollte die Möglichkeit geklärt werden, FEMLAB für die Verhaltenssimulation integrierter ASIC-Photodioden einzusetzen und in der zweiten Anwendung sollten spezielle photonische Kristalle untersucht werden.

Analysis of Electromagnetic Propagation for Evaluating the Dimensions of a Large Lossy Medium

A. Pellegrini[1] and F. Costa[1]
[1]ALTRAN Italia, Pisa, Italy

In this paper the propagation of a plane wave in a large lossy medium is presented. The investigated geometry consists in a wedgeshaped lossy dielectric embedded in a lossy material with different electromagnetic properties. The aim of the study is to determine the feasibility of a radar technique for measuring the length of the dielectric wedge. In order to address this problem and to evaluate ...

Modeling of Drying of Cellular Ceramic Structures: Coupled Electromagnetic and Multiphase Porous Media Model

A. Dhall[1], G. Peng[2], G. Squier[2], M. Geremew[3], L. Bogaczyk[2], J. George[3], W.A. Wood[3], and A.K. Datta[1]
[1]Biological and Environmental Engineering, Cornell University, Ithaca, New York, USA
[2]Manufacturing Technology & Engineering, Corning Inc., Sullivan Park, Corning, New York, USA
[3]Corporate Research, Corning Inc., Sullivan Park, Corning, New York, USA

Cellular ceramic substrates are extensively used for pollution control systems in vehicles. The manufacturing process of them can involve microwave drying. In this study, we describe the development of a modeling framework for the microwave drying process of these substrates. The transport model is implemented in COMSOL 3.5a using 4 PDEs: 1) Convection-Conduction for temperature, 2) ...

Hyperbolic Heat Transfer Equation for Radiofrequency Heating: Comparison between Analytical and COMSOL Solutions

V. Romero-García[1], M. Trujillo[2], M.J. Rivera[2], J.A. López Molina[2], and E.J. Berjano[3]
[1]Centro de Tecnologías Físicas Acústica, Universidad Politécnica de Valencia, Valencia, Spain
[2]Dpto. Matemática Aplicada, Instituto Universitario de Matemática Pura y Aplicada, Universidad Politécnica de Valencia, Valencia, Spain
[3]Institute for Research and Innovation on Bioengineering, Universidad Politécnica de Valencia, Valencia, Spain

The Radiofrequency Heating (RFH) is widely employed to heat biological tissue in different surgical procedures. Most models analyze the RFH employing a Parabolic Heat Transfer Equation (PHTE) based on Fourier's theory. The PHTE can be used for problems involving long heating times or low thermal gradients. However, when the problem involves short heating times or extreme thermal gradients it is ...

Heat Transfer Models for Microwave Thawing Applications

S. Curet, O. Rouaud, and L. Boillereaux

This study deals with numerical and experimental investigations of a microwave thawing process. The microwave power generation is calculated from Maxwell’s equations and then from Lambert’s law, using COMSOL Multiphysics. For those two different approaches, the heat source term depends on the dielectric properties of the material. Numerical simulations are compared with experimental ...

Simulation de la capacité d’un micro-commutateur RF par ingénierie inverse

D. Peyrou
LAAS, Groupe M2D, Paris

La présentation repose sur l’analyse de l’influence de la rugosité du diélectrique sur la capacité à l’état bas.

Elektromagnetische Wellen in der EMV Messtechnik

M. Koch, and S. Battermann
Leibniz Universität Hannover, Institut für Grundlagen der Elektrotechnik und Messtechnik

In diesem Beitrag werden die wichtigsten Feldtesteinrichtungen aus dem Bereich der elektromagnetischen Verträglichkeit vorgestellt. Ausgehend von den Anforderungen, die verschiedene Normen an die Feldqualität stellen, werden auftretende Probleme aufgezeigt. Mit numerischen Verfahren wird die Eignung für EMV-Messungen untersucht und anhand der Simulationsergebnisse werden die ...

Computational study of Solidification and Melting of Alloys

Shuang-Shii Lian
National Taiwan University

This paper is written in Chinese. --------------------------------- Keynote speaker's biography: Since 1991, Prof. Shuang-Shii Lian has been with the Department of Materials Science and Engineering, National Taiwan University. He earned a PhD degree in Metallurgy at Technische Universität Berlin, Institut für Metallurgie, Germany in 1981. He is using COMSOL Multiphysics since 2002 ...

The Electromagnetic Field Analysis and Simulation of High Voltage Transmission Line

K.S. Su
National Kaohsiung University of Applied Science

In every modern society, high voltage transmission lines are a part of the environment. In some areas, people are forced to live close to them. This has given rise to a discussion on what effects radiation from high voltage transmission lines have on humans. In this presentation we try to answer some of these questions from the independent scientist's point of view, by providing not only ...

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