Technical Papers and Presentations

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Conductivity Effects in Electrical Tomography Systems

K.J. Alme [1], and S. Mylvaganam [2]
[1] Telemark Technological R&D Centre (tel-tek),Norway
[2] Telemark University College, Faculty of Technology, Norway

Electrical tomography systems estimate the cross-sectional distribution of an object by performing boundary measurements. These non-invasive measurements are sensitive to the electrical properties of the objects under investigation. The main focus in this paper is how to model these sensor systems using COMSOL Multiphysics. Results due to increasing conductivity and their effect on the ...

Modelling Multilayer Systems with Time-Depended Heaviside and New Transition Functions

Y. Bilotsky, and M. Gasik
Helsinki University of Technology, Finland

In this paper, a five-layerered, thin-film assembly (TFA) with time-dependent internal geometry (layers thickness) was considered. This is a practical case for multilayer structures such as layered composites and coatings. The thermoelasticity analysis of the system with residual stress was carried out using COMSOL Multiphysics. Heaviside functions applicable for such problems has ...

The Ginzburg-Landau Equation Solved by the Finite Element Method

T.S. Larsen, M.P. Sørensen, N.F. Pedersen, and S. Madsen
Technical University of Denmark

Around 1950 V.L. Ginzburg and L.D. Landau proposed a phenomenological theory for phase transitions. One of the more successful applications of the theory is to superconductivity and in particular to superconductors placed in a magnetic field. Some superconductors allow for magnetic field penetration through quantized current vortices when the magnetic field exceeds a threshold value. In ...

Topology Optimization in Multiple Physics Problems

O. Sigmund
Technical University of Denmark

Topology optimization in physics requires a deeper understanding of the physical mechanisms. Multiphysics modeling brings the challenge of understanding such physics to a higher level. In this presentation we present the fundamentals of Topology Optimization, accompanied with many examples from different branches such as Automotive Applications, Structural Mechanics, MEMS, Flow Transistors, ...

Design and Measurements on a Small Radial Flux Permanent Magnet Generator with Concentrated Coils

Ø. Krøvel, and R. Nilssen
Dept. of Electric Power Engineering, Trondheim, Norway

This paper shows calculations of inductance, induced voltage and torque using COMSOL Multiphysics. Results from cogging torque calculations gave a considerable DC-offset, but the curve shape resembled expectations. The values are compared with experimental data.

Automotive Headlamp - Analytic Solution and Measurements of Condensation Inside a Headlamp

E. Preihs
General Motors Europe, Sweden

Dew points higher than the inner surface temperature of a headlight can become cosmetic problems. In this paper, a suggested analytical approach of dew point analysis in headligths is brought forward. The analytical solution is based on a temperature map consisting of heat transfer, natural convection and radiation. An empirical expression for relative humidity is then implemented based on the ...

Experimental and Theoretical Studies on Air Exchange in Portable Devices

M. Olin [1], L. Laakso [1], J. Hannula [2], T. Galkin [2], K. Väkeväinen [2], and K. Hartikainen [3]
[1] University of Helsinki, Finland
[2] Nokia Corporation, Finland
[3] Ambertec Oy, Finland

In this paper, we perform a leakage analysis fitted to approximate analytical diffusion and air exchange models, by the helium injection method for one mobile phone type. In order to extend the applicability of our models, we developed a more complicated numerical model for diffusion, thermal conduction and free convection inside the phone.

Autothermal Reforming of a Hydrocarbon Fuel in a Monolithic Reactor

D. Creaser
Chalmers University of Technology, Sweden

In this paper, we perform simulations of the auto-thermal reforming of a hydrocarbon fuel in a monolithic reactor. The partial differential equations describing mass, heat and momentum transport were formulated and solved using COMSOL Multiphysics. It was found that mass transport limitations in the washcoat could also severely limit the rate of the reforming reaction. Heat transport ...

Deposition of Aerosol Particles in Electronic Devices

M. Olin [1], L. Laakso [1], J. Hannula [2], T. Galkin [2], and K. Väkeväinen [2]
[1] University of Helsinki, Finland
[2] Nokia Corporation, Finland

Small electronic devices are nowadays used in varying conditions, which expose them to stresses. One part of this stress is related to transport of potentially harmful chemical substances into small mechanical structures of devices, which happens by molecular diffusion and advection by air flow. We have applied a simplified contamination model, whose parameters, though, are estimated by ...

Current Distribution in the Electrodes of Industrial Three-phase Electric Smelting Furnaces

H.L. Larsen
Elkem AS Research, Oslo, Norway

In this paper, a model for a cross-section of the three electrodes in an industrial three-phase smelting furnace is made. The resulting current distribution within the electrodes is a function of the skin-effect within each electrode, and the mutual influence between the magnetic fields of the electrode currents - the so-called proximity effect.

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