Presentazioni e Articoli Tecnici

In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Stabilized Finite Element Modeling of the Flow Through Porous Medium

Khodabakhshi, G., Parvazinia, M.
Loughborough University, U.K.

The standard Galerkin method employing standard finite elements is not a robust approach for transport problmes exhibiting multiscale behaviour [1]. The elements enriched with bubble functions improve the stability of the solution dramatically. It is shown that basically all of stable methods are derived from particular class of subgrid scale models [2]. To prevent it, multiscale finite ...

Multiphysic FEMLAB modelisation to evaluate mid-infrared photonic detector performances

Cuminal, Y.1, Christol, P.2, Rodriguez, J.B2, Joullié, A.2
1 Laboratoire des Sciences des Matériaux et d’Automatique (LASMEA), Université Clermont II, UMR CNRS 6602, Aubiére, France
2 Centre d’Electronique et de Micro-optoélectronique de Montpellier (CEM2), Université de Montpellier-II, UMR CNRS 5507, Montpellier, France

Infrared photonic detectors operating in the mid infrared region find applications in pollution monitoring, high-speed infrared imaging systems and free space telecommunications. There is a need for new uncooled high performance detector systems and antimonide-based (Sb-based) semiconductor quantum structures could be an alternative of the well-established technologies. The main objective of ...

A Model of SuperRens Effect to Describe Future Generation Optical Data Storage

Gidon, S., Hyot, B., Poupinet, L.
CEA Grenoble Leti

In the quest for a higher data storage capacity, different solutions for the future generations of optical discs (after the Blu-ray format, BD) are under investigations. An increase of the NA beyond 0.85 (NA of the BD format) requires the use of near field optics with all the difficulties inherent to those techniques (fine control of the distance between the optical head and the media). Today ...

Zone sculpting using partitioned electrokinetic injections

Narovlyansky, M.1, Squires, T.M.2, Whitesides, G.M.1
1 Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, U.S.A.
2 Departments of Physics and Applied Mathematics, Caltech, Pasadena, CA

In electrokinetic separations, the narrower and more homogeneous the initial sample plug, the higher the ultimate resolution of the separation. Here we describe a general and versatile method to sculpt low-dispersion, high-fidelity sample zones in microfluidic devices for high resolution electrokinetic separations. In a simple channel intersections microfabricated partitions act to reduce each ...

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, ...

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. ...

Einsatz von FEMLAB in der Elektrotechnikausbildung

Timmerberg, J.
Fachhochschule Ostfriesland/Oldenburg/Wilhelmshaven, FB Wirtschaftsingenieurwesen, Wilhelmshaven

Unter Elektrotechnikausbildung ist in diesem Papier die Hochschulausbildung und insbeson-dere die in den Fächern Allgemeine Elektrotechnik und Theoretische Elektrotechnik zu ver-stehen. Üblicherweise wird das Gebäude der Elektrotechnik auf den Erfahrungssätzen des Strömungs-, elektrostatischen und magnetischen Feldes aufgebaut. Zur Motivation und Fes-tigung des Wissens werden dann in den ...

A finite–element simulation study of the complex effective permittivity of two-phase random composite materials

Brosseau, C.
Laboratoire d'Electronique et Systèmes de Télécommunications, Université de Bretagne Occidentale, Brest, France

In the current work we introduce a finite-element method (FEM) for calculating the effective permittivity of macroscopically inhomogeneous media. Specifically, we consider two-dimensional (2d) two-phase heterostructures consisting of hard circular disk equilibrated distributions. The hard-disk distribution has been chosen as the reference system since it is one of the simplest idealized models ...

A finite–element simulation study of the complex effective permittivity of two-phase random composite materials

Brosseau, C.
Laboratoire d'Electronique et Systèmes de Télécommunications, Université de Bretagne Occidentale, Brest, France

In the current work we introduce a finite-element method (FEM) for calculating the effective permittivity of macroscopically inhomogeneous media. Specifically, we consider two-dimensional (2d) two-phase heterostructures consisting of hard circular disk equilibrated distributions. The hard-disk distribution has been chosen as the reference system since it is one of the simplest idealized models ...

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