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.

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 ...

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, ...

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 ...

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 ...

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 ...

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 ...

Using COMSOL Multiphysics for the Modelling of a Hybrid Linear Stepper Motor

R. Wislati, and H. Haase,
Leibniz University of Hanover, Germany

In this paper a 2-phase hybrid linear stepper motor (HLSM), also known as Sawyer linear motor, has been considered as a potential approach in Variable Valve Actuation (VVA) Systems for Internal Combustion Engines. Initially, the reluctance network approach (RNA) with lumped parameters has been used assuming an infinite permeability of the steel core. The results have then been compared with a ...

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 ...

Flow Modeling in a Flat Membrane Module

B. Balannec1, J. M. Gozálvez-Zafrilla2, D. Delaunay1, and M. Rabiller-Baudry1
1UMR - "Sciences Chimiques de Rennes", Université de Rennes, Rennes, France
2Departamento de Ingeniería Química y Nuclear, Universidad Politécnica de Valencia, Valencia, Spain

A CFD calculation of the complex three dimensional flow in a flat membrane module (Rayflow X100, Orelis- Novasep) was made under the conditions of a typical fouling study in order to compare velocity distribution to fouling deposit (with charcoal). The flow was turbulent in the inlet/outlet pipes of the module and laminar in the channel containing the membrane. The local Reynolds number was ...

2D Magneto-Thermal Modeling of Coated High-Temperature Superconductors

F. Roy1, B. Dutoit1, F. Sirois2, and F. Grilli3
1École polytechnique fédérale de Lausanne, Lausanne, Switzerland
2Éole polytechnique de Montréal, Montréal, Canada
3F. Grilli, Los Alamos National Laboratory, Los Alamos, NM, USA

Thin films are very promising for the design of novel and an efficient Fault Current Limiter (FCL) made of high-temperature superconductors (HTS). However, before considering the use of these in a power grid, their thermal and highly non-linear electromagnetic behavior in the presence of over-critical currents needs to be investigated in detail.In this paper, we propose a numerical approach to ...

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