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.

Multiphysics Simulations of Tunneling Current Modulation using Ultra-Thin Membranes Micromachined on SOI

B. Bercu, L. Montès, G. Bacles, J. Zimmermann, and P. Morfouli
Institute of Microelectronics, Electromagnetism and Photonics, Grenoble

In this paper, we study a novel type of NEMS - tunnel junctions mounted on thin membranes. Mechanical stress applied to the junction induces changes in the height and length of the barrier, allowing the modulation of the tunnelling current.

Electromagnetic Wave Simulation in Fusion Plasmas

O. Meneghini[1], and S. Shiraiwa[1]
[1]Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

COMSOL has been used to model the propagation of electromagnetic waves in fusion plasmas. For the first time, a finite element method has been used to solve the wave propagation for realistic fusion plasma parameters in the lower hybrid and ion cyclotron frequency ranges. Moreover, for lower hybrid waves, a new efficient iterative algorithm has been developed to take into account the dispersive ...

Multiphysics Modelling of a Micro Valve

F. Bircher[1] and P. Marmet[1]

[1]Institute of Print Technology, Bern University of Applied Sciences, Burgdorf, Switzerland

Electromagnetic micro valves are currently developed empirically or the different physics are treated separately. To accelerate the development-process and for a better understanding of the overall system, a multiphysics simulation is built up. This simulation considers the electromagnetics, the electronics (including the control of the process), the mechanics and the fluidics with respect to the ...

Computational Micro Fluid Dynamics: Part 1: Basic Principles and Simulation

F. Schönfeld
Institut für Mikrotechnik Mainz, Fluidik und Simulation, Mainz

The development of micro-TAS, Lab-on-a-Chip-systems and micro-reactors relies on the extensive use of computational fluid dynamics (CFD). The presentation aims to highlight specific µ-fluidic features, adequate simulation methods and benefits in context with the design of microfluidic systems. A case study discusses the modeling and characterization of a microfluidic device combining ...

Surface Acoustic Wave Generation in Wurtzite and Zincblende Piezoelectric Materials

D.B. Carstensen, T.A. Christensen, and M. Willatzen
University of Southern Denmark

A surface acoustic wave (SAW) device consists of a piezoelectric material (or film) on which interdigitated transducers (IDT) are placed. Here, they are analyzed based on PZT-5H wurtzite ceramics and InSb zincblende crystals. In PZT-5H, it is possible to generate SAW’s by aligning the interdigitated transducers (IDT) with the crystal axes. In the case with InSb zincblende structures ...

Stress Field Simulation for Quantitative Ultrasound Elasticity Imaging

L. Yuan[1] and P.C. Pedersen[1]
[1]Department of Electrical and Computer Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts, USA

Finite element models using COMSOL Multiphysics and MATLAB were developed to solve the problem of stress distribution interior homogeneous, isotropic, incompressible elastic solid material under known vertical external compression with a rectangular contact surface. Moreover, comparison between these results and analytical solutions was used to further validate that stress drops off with ...

COMSOL Implementation of Valet-Fert Model for CPP GMR devices

T. Xu[1], C.K.A. Mewes[1], S. Gupta[2], and W.H. Butler[1]
[1]Department of Physics and Astronomy and Center for Materials for Information Technology, University of Alabama, Tuscaloosa, Alabama, USA
[2]Department of Metallurgical and Materials Engineering and Center for Materials for Information Technology, University of Alabama, Tuscaloosa, Alabama, USA

The Giant Magneto Resistance (GMR) effect is a quantum mechanical effect which can be observed in systems consisting of thin alternating ferromagnetic and non-ferromagnetic layers. Simulation using COMSOL allows the evaluation of the magneto-resistance ratio and the electrical resistances of realistic CPP-GMR devices and opens the possibility to study new device materials and designs.

Deep Desulfurization of Diesel Using a Single-Phase Micro-Reactor

G. Jovonavic[1], J. Jones[1], and A. Yokochi[1]
[1]School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, Oregon, USA

This paper describes the benefits of computational fluid dynamics in the development of a microreactor used in the desulfurization of aromatic compounds. It is crucial to verify diffusion and extinction coefficients to ensure accurate simulation results prior to experiments. COMSOL Multiphysics was used to model the behavior of all of the possible species present and reactions that may occur.

Stability and Bifurcation of Cathode Arc Attachment in AC Operated High-Intensity Discharge Lamps

A. Lenef
Osram Sylvania

High-intensity discharge (HID) lamps are highly-efficient light sources with many applications. Depending on the dimensions of the electrode, lamp current, and waveforms, the plasma may attach to the cathode in a diffuse mode, that covers the electrode tip surface, or a localized mode where heating and current transfer occur in a local region of the electrode surface. The localized mode is ...

Fuel Cell Modeling Activities

M. Noponen
VTT Technical Research Centre of Finland

Although the principle of the Fuel Cell was discovered in the first half of the 19 th century, the research on Fuel Cells is still a growing area. In this presentation we start by outlining the basic principles of the Fuel Cell. We then give a more detailed study of the Solid Oxide Fuel Cell (SOFC), and the Polymer Electrolyte Fuel Cell (PEFC). We then continue by showing experimental ...

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