Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Transient Electromagnetic-Thermal FE-Model of a SPICE-Coupled Transformer Including Eddy Currents with COMSOL Multiphysics 4.2

H. Neubert[1], R. Disselnkötter[2], and T. Bödrich[1]
[1]Technische Universität Dresden, Institute of Electromechanical and Electronic Design, Dresden, Germany
[2]ABB AG, Forschungszentrum Deutschland, Ladenburg, Germany

Current transformers are used to measure currents in power grid systems. They are characterized by strong interactions between external electrical sources and loads respectively and the magnetic subsystem. Self-heating due to losses has to be considered because of the temperature-dependent material behaviour. The paper presents a transient 3D FEA transformer model which includes a H(|B|) ...

Numerical Analysis of Propeller-induced Low-frequency Modulations in Underwater Electric Potential Signatures of Naval Vessels in the Context of Corrosion Protection Systems

D. Schaefer[1], J. Doose[2], A. Rennings[1], and D. Erni[1]
[1]General and Theoretical Electrical Engineering (ATE), Faculty of Engineering, University of Duisburg-Essen, Duisburg, Germany
[2]Technical Center for Ships and Naval Weapons (WTD 71), Bundeswehr, Eckernförde, Germany

Since October 2009 the laboratory of ATE has carried out collaborative research with the WTD 71 that aims for prediction, reduction and optimization of so-called underwater electric potential (UEP) signatures. COMSOL is used to simulate potential distributions in the context of impressed current cathodic protection (ICCP) systems. The electrode kinetics is considered by using boundary conditions ...

Expert System for Synchronous Machines Based on COMSOL Multiphysics

G. E. Stebner, and C. Hartwig
Ostfalia University
IMEC
Wolfenbüttel, Germany

Even though the researches in synchronous machines are advanced, the practical design still is a problem because of the complex interaction between several design parameters. The project “EaSync” at the Ostfalia University focuses on the bundling of machine models using COMSOL Multiphysics® to create a semi-automatic engineering process. The project is based on student research projects and a ...

Multiphysics Modeling of a Gas Bubble Expansion

B. Chinè [1], and M. Monno[2]
[1]Laboratorio MUSP, Macchine Utensili e Sistemi di Produzione, Piacenza, Italy and Instituto Tecnologico de Costa Rica, Cartago, Costa Rica
[2]Politecnico di Milano, Dipartimento di Meccanica, Milano, Italy

Modeling and simulation softwares are very useful tools when we have to analyse and understand the different phenomena occurring during metal foams processing, because several simultaneous physical mechanisms have to be accounted for. In this work we use Comsol Multiphysics 4.2 to model a spherical hydrogen gas bubble expanding in aluminium liquid, initially at rest. The aim of the present ...

Numerical Modeling of Cold Crucible Induction Melting

I. Quintana[1], Z. Azpilgain[1], D. Pardo[2], and I. Hurtado[1]
[1]Mechanical and Industrial Production Department, Faculty of Engineering, Mondragon Unibertsitatea, Loramendi 4, Mondragon 20500 Gipuzkoa, Spain
[2]Department of Applied Mathematics, Statistics, and Operational Research, University of the Basque Country (UPV/EHU), Leioa, Spain, and IKERBASQUE (Basque Foundation for Sciences), Bilbao, Spain

This paper describes a numerical solution method for the simulation of a cold crucible induction melting (CCIM) process involving the coupling of electromagnetic, temperature and turbulent velocity fields. During the CCIM process, the metal charge is contained on a water cooled segmented copper crucible, and the energy necessary to heat, melt, and overheat the charge is generated by an ...

Comparison Between Honeycomb and Fin Heat Exchangers

P. Gateau[1], P. Namy[2], and N. Huc[3]
[1]SAS SYNGAS, rue du camp d’aviation, 44320, Saint Viaud, France, paul.gateau@syngas.eu
[2]SIMTEC, 8 rue Duploye, 38100, Grenoble, patrick.namy@simtecsolution.fr
[3]COMSOL FRANCE, WTC, 38000, Grenoble, nicolas.huc@comsol.fr

Metal honeycombs are used as catalyst supports. They can be considered as complex fins for heat exchange. A simple heat transfer model was compared with 2D simulations using COMSOL Multiphysics. There was a good correlation when the fluid temperature was the same in all cells. However, significant discrepancy apperared when compared with a 3D simulation with laminar flow. Honeycomb cells ...

Heat and Mass Transfer in a Gypsum Board Subjected to Fire

B. Weber
Empa
Swiss Federal Laboratories for Materials Science and Technology
Duebendorf, Switzerland

Heat and mass transfer through a gypsum board exposed to fire is simulated and compared to experimental data. The gypsum board is modeled as a porous medium with moist air in the pores. A dehydration front develops at the fire side and travels through the board, consuming energy and releasing water vapor. The vapor migrates through the porous medium by convection and diffusion, and condenses in ...

Fluid-Structure Interaction Modeling for an Optimized Design of a Piezoelectric Energy Harvesting MEMS Generator

I. Kuehne[1], A. van der Linden[2], J. Seidel[1], M. Schreiter[1], L. Fromme[2], and A. Frey[1]
[1]Siemens AG, Corporate Research & Technologies, Munich, Germany
[2]Comsol Multiphysics GmbH, Göttingen, Germany

This paper reports the design of a piezoelectric energy harvesting micro generator for an energy autonomous tire pressure monitoring wireless sensor node. For our design we use a piezoelectric MEMS generator approach without additional mass. The intrinsic mass of the cantilever is in the microgram region and the resulting acceleration forces are very small. The generator has a triangular ...

Modeling of a Switchable Permanent Magnet Magnetic Flux Actuator

I. Dirba, and J. Kleperis
Institute of Solid State Physics of University of Latvia
Riga, Latvia

A simple magnetic circuit consisting of ferromagnetic core material, air gap, permanent magnets and current coils can be used to form magnetic actuators, motors etc. devices. In this work the current coils are not used to generate working magnetic field, but just to switch magnetic flux created by permanent magnets in necessary direction. Analytical and numerical (Finite Element Model, ...

Direct Pore-scale Modeling of Two-phase Flow Through Natural Media

I. Bogdanov, J. Kpahou, and A. Kamp
Open and Experimental Centre for Heavy Oil (CHLOE)
University of Pau
Pau, France

Direct numerical simulation of single- and two-phase flow in real pore systems is addressed in our paper. The X–ray computed micro-tomography technique has been applied first to reconstruct in details a real pore space of a subcentimetric sample. Making use of dedicated software (ScanIP) the generated porous medium images has been processed to build a 3D pore space geometry. Finally, based on ...