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.

Mass Transfer from a Single Spherical Bubble with the Presence of Chemical Reaction - the Effect of Interface Contamination at Low Reynolds Number

A. Dani, A. Cockx, and P. Guiraud
Ingénierie des Systèmes Biologiques et des Procédés, CNRS, INRA, INSA, Toulouse, France

The objective of this work is to compute the mass transfer with chemical reaction (first order reaction) from a single spherical bubble at a low Reynolds number by Direct Numerical Simulation. Firstly, the contamination of the bubble's surface by the surfactants is considered, since this can reduce the slip velocity at the interface. The stagnant cap model is used to represent these phenomena and ...

Design of Light Emitting Diodes (LED)

E. Baur, M. Sabathil, and N. Linder
Osram Opto Semiconductors GmbH, Regensburg, Germany

For a proper design shaping of light emitting diodes, the exact knowledge of the current distribution in the active area is essential. On the one hand, one has to achieve a uniform current density over the chip area, on the other hand, one has to avoid current crowding in the neighborhood of the electrical contacts. In this paper it is shown first how a LED can be modeled by COMSOL Multiphysics. ...

A Material Model for Simulating Volume Changes during Phase Transformations

M. Tehler, and S. Jonsson
Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden

The present work describes the first steps in creating a robust material model able to predict volume changes due to thermal expansion and phase transformations.A dilatometer test is simulated starting from room temperature, with an original microstructure constituting a mixture of ferrite and pearlite. During heating, the structure transforms to austenite, which upon quenching will transform ...

Simulation of Salt Diffusion in a Pork (bacon) Side using 3D Imaging

R. Said1, R. B. Schüller2, P. Young3, A. Aastveit2, and B. Egelandsdal2
1Simpleware Ltd, Exeter, UK
2Norwegian University of Life Sciences, Ås, Norway
3University of Exeter, SECAM, Exeter, UK

Simulation of salt diffusion in a pork (bacon) side is a relatively complex task since such a piece often consists of different regions of skin, meat, fat and bone; each with diffusion coefficients that vary by orders of magnitude. Adding to this complexity is the arbitrary shape and topology of each region; separately and combined.This paper will present a comprehensive solution for constructing ...

Implementation of Hysteresis Material Characteristics in Finite Element Computations

P. Sergeant, and L. Dupré
Department of Electrical Energy, Systems and Automation, Ghent University, Ghent, Belgium

The hysteresis loss in a sample is obtained by evaluating the drag force profile when slowly moving the sample forward and backward through the strong field of a permanent magnet.A numerical time-stepping model is presented that calculates the drag force profile. At every time step, the sample is slightly moved relative to the magnet. The model is based on 2D-FE computations (COMSOL AC/DC module, ...

Transient Heat Conduction in Semi-Infinite Solids Irradiated by a Moving Heat Source

N. Bianco1, O. Manca2, S. Nardini2, and S. Tamburrino2
1Dipartimento di Energetica, Termofluidodinamica applicata e Condizionamenti ambientali, Università degli Studi Federico II, Napoli, Italia
2Dipartimento di Ingegneria Aerospaziale e Meccanica, Seconda Università degli Studi di Napoli, Napoli, Italia

An analysis of the transient temperature distribution in a semi-infinite solid, irradiated by a moving Gaussian laser beam, is carried out numerically using COMSOL Multiphysics.Variable thermo-physical properties are accounted for. The workpiece is considered semi-infinite along the motion direction. Temperature distributions are evaluated both for different Peclet numbers and surface heat ...

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 ...

COMSOL 2D Simulation of Heavy Oil Recovery by Steam Assisted Gravity Drainage

I. I. Bogdanov, K. El Ganaoui, and A. M. Kamp
Centre Huile Lourde Ouvert et Expérimental (CHLOE), Pau, France

Multiphysics flexibility and computational performance of COMSOL gave us the idea to model SAGD (steam assisted gravity drainage), one of the popular thermal methods of oil recovery. The modeling is far from straightforward and requires solving a system of non-linear PDEs for thermal multiphase flow under conditions of thermodynamic (phase) equilibrium. This paper presents the main results of our ...

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 ...

Numerical Modeling of Dielectrophoretic Forces Acting upon Biological Cells in Silicon Lab-On-Chip Devices

S. Burgarella, M. Bianchessi, and M. De Fazio
Advanced System Technology, R&I e-Health, STMicroelectronics, Agrate Brianza, Italy

Dielectrophoresis (DEP) is a promising method for the automated separation of biological cells in a miniaturized format. This technology allows cells to be manipulated electronically while suspended in a microfluidic channel embedded in a silicon lab-on-chip. In this work, several dielectrophoretic configurations have been designed and fabricated using micro-electro-mechanical-systems (MEMS) ...

Quick Search

1 - 10 of 158 First | < Previous | Next > | Last