Artigos Técnicos e Apresentações

Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abramgem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

Eigenmodes of Photoacoustic T-cells

Baumann, B.1, Kost, B.1, Groninga, H.2, Wolff, M.1, 2
1 University of Applied Sciences Hamburg, Mechanical and Production Engineering
2 PAS-Tech GmbH, Zarrentin

The photoacoustic effect is based on resonant absorption of light by a sample and the transfer of the excitation energy into thermal energy via inelastic collisions of gas molecules. A modulated irradiation of the sample causes periodic pressure variations that can be detected by a microphone and measured using lock-in technique. Photoacoustic spectroscopy finds many applications in the field of ...

Behavior of the 3D Axon when a Squared Voltage Pulse is Applied

Rodríguez Rodríguez, E.1, Godinez Fernández, R.2, Barrales Guadarrama, R.1, Vázquez Cerón, E.1
1 Universidad Autónoma Metropolitana- Azc, Azcapotzalco, México, D.F.C.P.
2 Universidad Autónoma Metropolitana-Izt

The axon in one of the most important components in nervous impulse transmission. It is very important to understand how the electric potential changes along the axon, using the telegraph equation. In the following simulation with FEMLAB we show the transmission and diffusion along the axon in 3D when a squared voltage is applied. The simulation is used for educational purposes in ...

3-D Multiphysics Modeling of a Producing Hydrocarbon Field

McKenna, J.R.1, Blackwell, D.D.2
1 U.S. Army Engineer Research & Development Center, Geotechnical & Structures Laboratory, Vicksburg, Mississippi
2 Department of Geological Sciences, Southern Methodist University, Dallas, Texas

Thermal anomalies indicating elevated temperatures often are present in producing hydrocarbon fields. This paper discusses precision temperature logs obtained over a salt dome in the Bayou Bleu hydrocarbon field in southwest Lousiana, and presents a 3-D thermal-fluid model of the dome constrained by these types of logs. The numerical model in which both an enhanced thermal conductivity ...

Optimisation of the Electrochemical Instrumentation of a Wear Simulator through Finite Element Modelling

Déforge, D.1, 2, Ponthiaux, P.2, Wenger, F.2, Lina, A.1, Ambard, A.1
1 Electricité de France (EDF) R&D, Chemistry and corrosion group, Les Renardières, Moret sur Loing cedex, France
2 Laboratory LGPM, Ecole Centrale Paris, Chatenay-Malabry cedex, France

Stainless steels are often used in nuclear power plants due to their good corrosion resistance. This good behaviour is due to an oxide film which forms on their surface and insulates them from the corrosive media. Sometimes, flow-induced vibrations can however lead to some contacts between the components, and thus to the degradation of this oxide film. The mechanical removal leads to an increase ...

Simulation of magnetic injection moulding

Ogur, E.O., Goodship, V., Smith, G.F.
University of Warwick

Magnetic fields play a crucial role in materials science and they have been used extensively in the study of materials where they tend to alter the dynamics of charged particles. The purpose of this paper is to investigate the effect of an external magnetic field generated from a permanent magnet and its interaction, during the injection moulding, with polymer containing ferromagnetic nickel ...

Analysis of magnetohydrodynamics GTAW arc behavior

Roger, F.
Ecole Nationale Superieure de Techniques Avancées, PARIS

Argon plasma behavior in gas tungsten arc welding (GTAW) is directly linked to the weld quality. Indeed, the arc is the heat source which drives the weld shape. Solution of an induction-diffusion equation under axial symmetry conditions has been developped using thermal conduction and convection module of FEMLAB 3.1©. We predict current distribution in electric arc, induced magnetic field ...

Zur Kopplung zwischen Transport und chemischen Speziationsrechnungen mit FEMLAB®

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

In vielen Berechnungen des Umweltschutzes, der chemischen Verfahrenstechnik, der Energietechnik und weiteren Bereichen von Wissenschaft und Technik, spielen Transport- und Reaktionsprozesse gleichermaßen eine Rolle. Aufgrund der Wechselwirkung zwischen Transport und Reaktion ist das Verständnis derartiger Systeme schwierig. In der Regel werden daher Modelle eingesetzt, um derartige Situationen ...

Modeling transport in silicon nanocrystal structure

Leroy, Y., Leriche, B., Cordan, A.S.

We present in this paper a model to study new memory devices with embedded nanocrystals, emerging in microelectronics. The theoretical calculations and their implementation in FEMLAB are detailed, leading to a quite simple and realistic model. One key point for these memories is the electronic tunnel transfer to store the charge into a nanocrystal. This is why we carry out a brief analysis of ...

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 ...

Enhanced multipole boundary conditions in FEMLAB

Kildishev, A.1, Danielsson, E.2
1 Purdue University, School of Electrical and Computer Engineering

Designers of electromagnetic and electromechanical devices often need to predict external magnetic fields of devices with good accuracy. This paper considers a less common approach to the open boundary problems, which is built on the spatial harmonic analysis (SHA) of the field over a basis boundary of the finite element (FE) domain. It is important that the spatial harmonic analysis of complex ...

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