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.

An Extension of Lauwerier’s Solution for Heat Flow in Saturated Porous Media

S. Saeid[1] and F.B.J. Barends[2]
[1]Technical University of Delft, Delft, The Netherlands
[2]Deltares and TU-Delft, Delft, The Netherlands

One of the crucial topics in this century is sustainable energy. In this respect, the exploitation of geothermal energy from deep hot aquifers becomes opportune. Hence, insight is required in the heat balance of potential aquifer systems. Essential issues are convection, conduction and dispersion. This article focuses on Lauwerier’s problem. As an extension, it is suggested that beside ...

Microstimulation in The Brain: Does Microdialysis Inuence the Activated Volume of Tissue?

D. Krapohl[1][3], S. Loeffler[2], A. Moser[2], and U.G.Hofmann[1]

[1]Institute for Signalprocessing, University of Luebeck, Lübeck, Germany
[2]Institute for Neurology, University of Luebeck, Lübeck, Germany
[3]Department of Information Technology and Media, Mid Sweden University, Sundsvall, Sweden

Deep Brain Stimulation (DBS) has been established as an effective treatment for Parkinson's disease and other movement disorders. The stimulation is currently administered using tetrode-macroelectrodes that target the Subthalamic Nucleus (STN). This often leads to side effects which bias the surrounding areas, e.g. the speech centre. Targeting a specific brain region can better be achieved with ...

A Study of FEMLAB for Modeling High Frequency Ultrasound Scattering by Spherical Objects

Falou, O.1, Kumaradas, J.C.2, Kolios, M.C.3 1 Dept. of Electrical and Computer Engineering, Ryerson University, ON, Canada
2 Dept. of Electrical and Computer Engineering & Dept. of Physics, Ryerson University, ON, Canada
3 Dept. of Physics, Ryerson University, ON, Canada

Analytical solutions to the problem of wave scattering from three dimensional structures such as spheres have been studied extensively in the past. However, these solutions are not flexible enough to be extended to wave scattering from complex geometries. We have developed a finite element model of acoustic wave propagation through spherical structures to solve the problem of highfrequency (20 ...

Zweistufiges Modell zur Untersuchung von Marangoni-Konvektion in Schwingenden Flüssigkeitsstrahlen

Modigell, M.
RWTH Aachen, Institut für Verfahrenstechnik, Lehr- und Forschungsgebiet Mechanische Verfahrenstechnik

Der Marangoni-Effekt (Marangoni 1871) oder Grenzflächenkonvektion kann in fluiden mehrphasigen Systemen auftreten, in denen eine Abhängigkeit der Grenzflächenspannung von der Temperatur oder der Konzentration einer gelösten Substanz besteht. Temperaturoder Konzentrationsgradienten in der Grenzfläche führen zur Ausbildung von Spannungsgradienten. Diese beeinflussen die ...

FEMLAB® Performance on 2D Porous Media Variable Density Benchmarks

Holzbecher, E.
Humboldt Universität Berlin, IGB, Berlin, GERMANY

Variable density problems are suitable test-cases for multi-physics codes, as the interaction between flow and transport processes is a characteristic of the observed phenomena. This contribution focuses on density-driven flow benchmarks in porous media. Here FEMLAB® results are shown for the Henry model concerning stationary saltwater intrusion, and the Elder heat convection experiment in a ...

Diffusion-controlled Redox Cycling at Nanoscale Interdigitated Electrodes

Yang, X.1, Zhang, G.1, 2, 3
1 Micro/Nano Bioengineering Laboratory, Department of Biological and Agricultural Engineering
2 Nanoscale Science and Engineering Center
3 Faculty of Engineering, The University of Georgia, Athens, GA 30602, USA

Diffusion controlled redox cycling behavior at nanoscale interdigitated electrodes (IDEs) was simulated using FEMLAB. Cyclic voltammograms were obtained for IDEs with various sizes and spacing, and current collection efficiency and cycling number were calculated. We found that as the size of the IDEs decreased, the shape of the voltammogram changed from a peak-shaped curve to a sigmoidal ...

Electromagnetic simulations of Goubau transmission lines with FEMLAB

Akalin, T.
IEMN, Institut d’Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, USTL Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France

The BioMEMS (Bio-Electro-Mechanical Systems) have become of considerable interest because they constitute a converging solution for many pluridisciplinary studies. The different covered fields are the biology (single cell, proteins, enzymes, neurons…), the chemistry (polymers), microelectronics and the microtechnologies associated with. Devices whose aim is the study of biological entities are ...

Einsatz von FEMLAB bei der Optimierung der Geometrie eines Hochspannungsimpulstransformators

Cernat, R.1, Brinkmann, C.1, Weißgerber, T.2
1 Universität Dortmund, Lehrstuhl für Hochspannungstechnik und EMV
2 era GmbH, Dortmund

Hochspannungsimpulstransformatoren werden bei Ottomotoren zur Entzündung des Kraftstoff- Luft-Gemischs eingesetzt. Aktuelle Fahrzeuge sind mit zylinderselektiver Zündung ausgerüstet, so dass für jeden Zylinder ein Zündtransformator benötigt wird. Dieser ist direkt über der Zündkerze positioniert und stellt die benötigte Hochspannung sowie eine ausreichende Funkenenergie zur Verfügung, ...

Zeitliche Entwicklung der Elektronendichteverteilung in einer linear ausgedehnten Plasmaquelle

Graf, M., Räuchle, E., Hunyar, C., Unger, R., Kaiser, M., Emmerich, R., Urban, H., Alberts, L., Elsner, P.
Fraunhofer-Institut für Chemische Technologie, Pfinztal, Germany

In this article the time variable development of electron density in low pressure microwave discharges is examined. Exemplarily the linear extended plasmaline® is simulated in an axially symmetric two-dimensional application mode. The multiphysics environment of FEMLAB allows a self consistent solution of Maxwell’s equations together with a simple model for generation and loss of electron ...

Flow behaviour of phosphorus-deoxidised copper in plane-strain hot extrusion

Jin, L.Z.1, Ssemakula, H.2, Sandström, R.1
1 Department of Materials Science and Engineering, Royal Institute of Technology, Sweden
2 Department of Production Engineering, Royal Institute of Technology, Sweden

Flow behaviour of phosphorus-deoxidised copper in plane-strain hot extrusion with an insertion in the die has been studied through a finite-element model consisting of fluid dynamics and heat transfer approaches. The billet material is considered as rigid-visco-plastic and rate-sensitive. A dynamic viscosity, which is strain-rate and temperature dependent, has been integrated into the model. ...

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