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.

Accurate geometry factor estimation for the four point probe method using COMSOL Multiphysics

Kalavagunta, A., Weller, R.A.
Vanderbilt University, Nashville, TN

The four-point probe is a tool for measuring the resistivity of a material by contact with its surface. The tool is widely used in the semiconductor industry and has applications both in research and manufacturing. The method though is quite sensitive to various paramaters like the substrate material, probe separation, probe depth etc. In this paper we show that COMSOL multiphysics can be used ...

Using COMSOL Multiphysics Capability for Engineering High Q MEMS Resonators

Amy Duwel
Charles Stark Draper Laboratory
Cambridge, USA

Micromechanical resonators are used in a wide variety of applications, including inertial sensing, chemical and biological sensing, acoustic sensing, and microwave transceivers. Despite the distinct design requirements for each of these applications, a ubiquitous resonator performance parameter emerges. This is the resonator’s Quality factor (Q), which describes the mechanical energy damping. ...

Electromagnetics at Optical and Microwave Frequencies using COMSOL Multiphysics

Howie Stuart
Bell Laboratories, Lucent Technologies
Whippany, USA

The flexibility of COMSOL Multiphysics enables a variety of computational approaches to be applied towards solving electromagnetic problems across the whole spectrum. I will describe techniques for studying resonant electromagnetic interactions in a range of structures, including materials with negative electric permittivity (metals at optical frequencies), and small microwave resonators and ...

Mathematical modeling of nanomaterials

Strauss, D.J., Trenado, C.
Institute of New Materials, Saarbrücken

Mathematical modeling at the Institute of New Materials has played a crucial role in supporting the manufacturing and design of new technologies of nanomaterials, whose applications range from transportation, electronics and optics engineering to environmental sciences. In this paper, we focus our attention to two mathematical models together with their corresponding FEMLAB simulations: The ...

Finite-element Analysis of Properties in Real and Idealized Photonic Crystal Fibres, Application to Supercontinuum Generation

Gérôme, F., Viale, P., Tombelaine, V., Leproux, P., Auguste, J.L., Février, S., Blondy, J.M., Couderc, V.
IRCOM, CNRS UMR 6615, Limoges, France

Using a full-vector finite-element method, we calculate modal properties in index-guiding photonic crystal fibres. The influence of the deformation of the geometry in actual fibre structures is evaluated and compared to the idealized-model. These results are applied to the supercontinuum generation. Moreover, development of MATLAB softwares for FEMLAB 3.1 are presented.

In Situ electric field simulation in Metal/Insulator/Metal (MIM) capacitors.

Gaillard, N., Pinzelli, L., Gros-Jean, M., Bsiesy, A.
STMicroelectronics

In recent years, a large variety of high dielectric constant materials has been studied as an alternative to silicon dioxide in order to improve the electrical properties in many integrated devices. The authors pointed out MIM electrical properties modifications such as current-voltage shift and the decrease in the voltage gap between the different conduction mechanisms voltage threshold while ...

Modeling an integrated, high flow rate MEMS ferrofluid pump

Mao, L., Koser, H.
Department of Electrical Engineering, Yale University, New Haven, CT

We present a FEMLAB modeling study of an integrated, high-flow rate microfluidic pump for ferrofluids. Initial studies of these microfluidic devices have been performed using a onedimensional setup in MATLAB and later confirmed by corresponding simulations with FEMLAB 3.1 in partial differential equation (PDE) mode. It is determined that maximum flow velocity is achieved when the product of ...

Numerical Simulation of the Electrochemical Impedance of a Microelectrode using FEMLAB

Gabrielli, C., Keddam, M., Rousseau, P., Vivier, V.
UPR 15 CNRS “LISE”, case 133 - Université P. & M. Curie, Paris, France

Numerical simulations of electrochemical impedance diagrams are reported using a 2D-axis symmetry FEM calculations. The impedance is the ratio of the potential over the current, but it is highly depending of the concentration of the various chemical species in the solution, particularly the ionic ones wich are sensible to migration, diffusion and convection effects. In this study, only the ...

COMSOL simulations using a comprehensive model for gas fluidized-bed reactors

Mahecha-Botero, A., Elnashaie, S.S.E.H., Grace, J.R., Lim, C.J.
Department of Chemical and Biological Engineering, University of British Columbia, East Mall, Vancouver, BC, Canada

COMSOL (formerly FEMLAB) is being utilized to solve partial differential equations simulating fluidized bed reactors as part of the development of a novel generalized fluidized-bed catalytic reactor model. Simulations are carried out to account for complex dynamic transport and hydrodynamic phenomena such as: heat and mass axial and radial anisotropic dispersion, temperature and pressure ...

3D electromagnetic modelling of a cold crucible for induction electro-processing of materials

Ernst, R.
EPM-MADYLAM laboratory, CNRS, Saint Martin d’Hères, France

The cold crucible is a tool which is frequently used for induction heating applications for the elaboration of materials by middle or high frequency magnetic field. This crucible is made of copper sectors assembled together to form the container in which the electroconductive material is molten. Each sector is water cooled, which keeps the crucible cold when the material is heated and molten ...

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