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.

Numerical Analysis of Fluid Mixing in a T-Shaped Micro Mixer

M. S. Virk, A. E. Holdø, and S. Kaennakham
Energy & Environmental Technology Applied Research Group, Faculty of Engineering and Computing, Coventry University, Coventry, UK

Microfluidic systems hold promise for many novel applications where rapid mixing is important, and has lead to a number of new developments. Despite such major developments, no systematic study has been carried out to understand the effect of flow mechanisms and geometry on microfluidic mixing. This work focuses on a mixing analysis of low Reynolds number (< 25) microfluids in a T-shaped passive ...

Design of UV reactors by CFD: Model Development and Experimental Validation

J. Hofman1,2,3, L. Shao2, B. Wols2, W. Uijttewaal2, G. I. J. Pelaar1, E. Beerendonk1, and H. van Dijk2
1Kiwa Water Research, Rijkswijk, The Netherlands
2Delft University of Technology, Delft, The Netherlands
3Waternet, Amsterdam, The Netherlands

UV technology is an emerging technology for drinking-water treatment. It can either be used as a disinfection barrier, where the UV light is used to inactivate pathogenic microorganisms, or in combination with hydrogen peroxide as an advanced oxidation process. The design of UV reactors is very complex. The water flow and related aspects of mixing, the UV light distribution, and the reaction ...

Coupled Electromagnetic, Thermal and Fluid Dynamics Simulation of Axial Flux PM Synchronous Machines

F. Marignetti
DAEIMI, Department of Automation, University of Cassino, Cassino, Italy

This paper investigates the Electromagnetic and thermal behavior of Synchronous Axial Flux Permanent Magnet Machines. The Axial Flux machine employed for tests and simulations has a Soft Magnetic Compound stator core. The electromagnetic analysis is used to assess electromechanical variables and machine parameters. Furthermore, the thermal source is obtained from a DC current flow model which is ...

An Optimized Convolutional-Perfectly Matched Layer (C-PML) Absorbing Boundary Condition for Second-order Elastic Wave Equations

O. Bou Matar1,2, E. Galopin1, Y. Li1,2, and O. Ducloux1,2
1Institut d'Electronique, de Micro-électroniqueet de Nanotechnologie, Villeneuve d'Acsq, France
2Laboratoire Européen Associé en MagnétoAcoustiqueNonlinéaire de la matière condensée (LEMAC), Ecole Centrale de Lille, Villeneuve d'Ascq, France

In this study, we extend the Convolution-Perfectly Matched Layer (C-PML) method we have developed for a first order system describing elastic waves in velocity and stress formulation to the same equation written as a second order system displacement.We illustrate the efficiency of this second order Perfectly Matched Layer upon 2D benchmarks with surface waves and Lamb Waves.

On the Convergence Order of COMSOL Solutions

A. Bradji1, and E. Holzbecher2
1Charles University, Prague, Czech Republic
2Weierstrass Institute for Applied Analysis and Stochastics WIAS, Berlin, Germany

The convergence of numerical solutions is mainly determined by the convergence order, which quantifies the improvement of the solution when the mesh is refined. In this paper we examine various differential equations and the convergence behavior of their COMSOL Finite Element solutions. The numerically observed convergence rates are compared with theoretical results, as far as these are ...

Modeling of Drops Spreading on Random Surfaces

J. Frassy1, C. Lecot2, M. Murariu3, C. Delattre1, and A. Soucemarianadin1
1Université Joseph Fourier, Grenoble, France
2Université de Savoie, Le Bourget-du-Lac, France
3LETI, CEA, Grenoble, France

We present simulations of drops spreading on random surfaces with either chemical or topographical heterogeneities. All the computations are made within the framework of the lubrication approximation. The droplet height is the solution of a time-dependent nonlinear fourth order partial differential equation, which is solved using COMSOL. Fast Fourier Transform (FFT) together with an appropriate ...

Modeling of High Temperature Crystal Growth Process

J-.M. Dedulle1,2, F. Mercier1, D. Chaussende1, and M. Pons3
1Laboratoire des Matériaux et du Génie Physique, Grenoble, France
2IRIS Technologies, Grenoble, France
3Science et Ingénierie des Matériaux et Procédés, Saint-Martin d'Hères, France

The main problem for the development of 3C-SiC electronics is the lack of an adapted bulk growth process.Indeed, sublimation, which is the classical process for the growth of 4H-SiC and 6H-SiC ingots, is not adapted for the 3C polytype because of the solid state transition from cubic to hexagonal crystals, which occurs at high temperature. We therefore choose growth from liquid phase rather than ...

On the Use of COMSOL Multiphysics to Understand and Optimize the Filling Phase in the Injection and Micro-Injection Molding Process

M. Moguedet1, P. Namy2, and Y. Béreaux3
1Pôle Européen de Plasturgie, Bellignat, France
2SIMTEC, Grenoble, France
3LAMCOS, Site de Plasturgie, INSA Lyon, Bellignat, France

The work presented here deals with the simulation of the cavity filling stage of the injection and micro-injection molding process for thermoplastic materials.COMSOL Multiphysics gives us the means to take into consideration some other aspects usually neglected in commercial 3D softwares dedicated to polymer processing. In particular, tracking of the flow front is based on a Level Set approach. ...

Metal Surface Laser Texturing: Multiphysics Modeling of a Single Impact Effect

A. Soveja1,2, J. M. Jouvard1, and D. Grevey1
1Institut Carnot de Bourgogne, Bourgogne, France
2Faculté de Génie Mécanique, Université "Politehnica" Timisoara, Timisoara, Romania

During laser-matter interaction, a very small layer of molten material forms. The vapor plumes, formed by material vaporization, exercise an overpressure on the molten material. In a previous work, a 1D thermal model was carried out, but this model did not account for all physical phenomena during laser-matter interaction. For that, it is necessary to couple the thermal equations, the fluids ...

Modeling Electromagnetic Wave Propagation in Planetary Cavities using COMSOL Multiphysics Tools

F. Simões
CETP/IPSL, Saint Maur des Fossés, France

The study of extremely low frequency electromagnetic wave propagation in the ionospheric cavities of celestial bodies in the Solar System follows an approach similar to that developed for the Earth. It contributes to the characterization of the atmospheric electric circuit and associated energy sources, and to the identification of the inner and outer cavity boundaries. A wave propagation, 3D ...

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