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.

Developing direct methanol fuel cells using FEMLAB as a modeling tool

Gianluca Bollito
Centro Ricerche FIAT
Orbassano, Italy

Fuel cell converts chemical energy directly to electrical energy through oxidation-reduction reactions. It consists of an electrolyte between two electrodes, the anode and the cathode. The engineering and materials challenges that must be overcome to produce fuel cells small enough for micro-applications (telephones, PDAs, etc.) are enormous, and will require innovative ...

The Unroutinary Loads on the LBT Adaptive Secondary Mirror

C. Del Vecchio
INAF-OAA, Firenze, Italy

The thin shell of the LBT Adaptive Secondary Mirror has been manufactured, optically polished, and delivered. The operations and tests required before finally mounting it on the telescope have to be run very carefully, as they imply loads completely different from the ones of the adaptive operational modes - studied in the past with very encouraging results. Deformations and stresses that occur ...

Simplified 2D and 3D Models of Coating Formation: Application to Plasma Sprayed Zirconia

K. Fataoui1, B. Pateyron1, M. El Ganaoui1, M. Amara1, H. Rhanim2, and A. Belafhal2
1Université de Limoges, Limoges, France
2Faculté des Sciences, Université Chouaib Doukkali, El Jadida, Marocco

Since the nineties many works have been dedicated to splat formation modeling. The main part of these works takes into account the molten droplet impact onto a flat surface, its flattening and solidification.The aim of this work is to test if a simplified model in 2D allows to characterize the real contact between the splat and the substrate and to compare the results of the experiments and the ...

Dual Solutions for Viscous Mixed Convection Flows in a Vertical Circular Duct: A Numerical Benchmark

S. Lazzari1, A. Barletta1 , E. Magyari1,2, and F. Piccinini3
1Dipartimento di Ingegneria Energetica, Nucleare e del Controllo Ambientale (DIENCA), University of Bologna, Bologna, Italy
2Institute of Building Technology, ETH - Zürich, Zürich, Switzerland
3Biomedical Engineering, Engineering School of Cesena, Cesena, Italy

Forced and free convection flow in a vertical isothermal circular duct is studied by taking into account the internal heating due to viscous dissipation. The momentum and energy balance equations lead to a nonlinear boundary value problem that is solved numerically by means of the finite-element software COMSOL Multiphysics.For any prescribed value of the average velocity smaller than a maximum, ...

Pre-design of a Molten Salt Thorium Reactor Loop

J. P. Caire, and A. Roure
LEPMI-ENSEE, Saint Martin d'Hères, France

The generation 4 of molten salt reactors using the thorium cycle are characterized by a temperature close to 1000 oC. The very large heat transfers involved between the reactor core and the external parts with minimal thermal losses are a major issue. This study investigated a possible inner loop made of a series of conventional graphite filter plate exchangers, pipes and pumps, using the COMSOL ...

Modeling the Coupled Heat and Mass Transfer during Fires in Stored Biomass, Coal and Recycling Deposits

F. Ferrero, M. Malow, A. Berger, and U. Krause
Bundesanstalt für Materialforschung und prüfung (BAM), Berlin, Germany

In this paper, advances in the development of a numerical model for predicting the possibility of self-ignition in stored biomass, coal heaps or underground seams and dump deposits are presented. Results from the performed simulations are compared with experimental data. Finally, some conclusions and the possibilities for future work are drawn.

Numerical Study of Surface Waves in Plasma

C. Hunyar, E. Räuchle, L. Alberts, R. Emmerich, M. Graf, M. Kaiser, and K.-D. Nauenburg
Dept. of Polymer Engineering/Microwave and Plasma, Fraunhofer-Institut Chemische Technologie (ICT), Pfinztal, Germany

Dense plasma can be produced by microwave (2.45 GHz) exited surface waves in a Plasmaline plasma source. This configuration allows one to generate large area plasmas (>1m2), which are well suited for technological applications, e.g., deposition of thin films, surface etching and cleaning in integrated circuit production, disinfection in medical applications, or plasma treatment of waste gases. ...

Analytical Methods for Reducing the Number of Independent Parameters Required to Model the Vocal Folds

D. D. Cook1, E. Nauman1, and L. Mongeau2
1Department of Mechanical Engineering, Purdue University, West Lafayette, IN, USA
2Department of Mechanical Engineering, McGill University, Montréal, QC, Canada

Mechanical tissue properties are required for reliable numerical models of the vocal folds. In this study, criteria for determining the compatibility of tissue property values obtained from independent studies are presented.Two methods for reducing the number of independent material parameters are given. The errors introduced by these assumptions were quantified by performing a modal analysis on ...

Fluid Exploration With CFD: an Engineering Teaching Tool

M. K. Smith
Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA

Computers are used every day to efficiently perform mathematical computations. For engineers to work efficiently, abstraction is necessary; this means hiding lower-level details of an algorithm to emphasize higher-level structure. In this presentation, the fluid exploration with CFD is explored. The presentation is based on a course held at Woodruff School of Mechanical Engineering.

Analysis of Small Multi-element Antennas Using the Eigenmode Solver

H. Stuart
LGS, Bell Labs Innovations, Whippany, NJ, USA

The eigenmode solver is used to analyze the behavior of small multi-element antennas. We perform an eigenmode simulation of the shorted antenna structure, using perfectly matched layer (PML) outer boundaries, and for some simulations, we include a current source located at the feed point of the antenna.Doing this enables the eigenmode simulation to determine both the Q-factor and radiation ...

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