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.

Numerical Simulation of the Filling Stage in the Polymer Injection Moulding Process

R. El Otmani1, M. Zinet1, M. Boutaous1, P. Chantrenne1, and H. Benhadid2
1CETHIL, Université Lyon, Villeurbanne, France
2Laboratoire de Mécanique des Fluides et d'Acoustique, Université Lyon, Ecully, France

During injection moulding of thermoplastic parts, high pressures, velocities and temperatures are experienced by the polymer in the filling phase. The numerical simulation of this phase is a complex task, especially for semi-crystalline polymers, because it involves a coupling between heat transfer, material structural transformation and crystallinity. The aim of this work is to present ...

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 ...

Modeling of Natural and Combined Natural-Marangoni Convection Flows in a Low Prandtl Number Material Filled in a Square Mold by using COMSOL

F. Mechighel1,2,3, M. El Ganaoui2, B. Pateyron2 and M. Kadja3
1Mechanical Engineering Department, Annaba University, Annaba, Algeria
2SPCTS Laboratory, Limoges University, Limoges, France
3Mechanical Engineering Department, Constantine University, Constantine, Algeria

In the present paper a problem with both natural and combined natural-Marangoni convection flow of materials (having small Prandtl numbers of 0.0128, 0.054 and 0.71, respectively) filled in an enclosure has been investigated by a numerical simulation using COMSOL. Solutions have been obtained for different values of the Rayleigh number. The generated flow under buoyancy and surface tension forces ...

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, ...

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 ...

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 ...

Multiphysics Modeling of Radio-Frequency Cooking

M. Rayner
Department of Food Technology, Engineering and Nutrition, Faculty of Engineering, Lund University, Lund, Sweden

A radio frequency-based cooking process for a meat product was modeled using the Heat Transfer Module. Included wasa term for internal heat generation as generated by Joule heating caused by an applied electric field. The dielectric and thermal properties were implemented as a function of temperature. The resulting simulation showed good agreement with experimental end point temperature data from ...

Design and Modeling of a Micro-active Suspension

T. Verdot and M. Collet,
FEMTO-ST Institute, Dept of Applied Mechanics

Nowadays, lightweight materials are widely used to reduce weight and increase available space in moving structures such as cars or aircraft. However, they constitute an intense vibrating environment that can strongly affect the operation of embedded micro-transducers such as frequency generators or inertial sensors. To alleviate this problem, we propose the concept of a Micro-Active Suspension ...

Modeling of Electromigration Induced Failure Mechanisms in Semiconductor Devices

F. Cacho, V. Fiori, C. Chappaz, C. Tavernier, and H. Jaouen
STMicroelectronics, Crolles, France

In advanced semiconductor devices, most of the reliability issues in interconnects occur at a local scale. More precisely, the voiding phenomenon in copper lines is one of the key issues. Hence, a better understanding of the mechanisms governing electromigration would enable the development of more accurate predictive models.A model of vacancy migration is proposed. The thermal, stress and ...

Analysis of a Capacitive Mass Flow Sensor for a Screw Conveyor

A. Fuchs, and H. Zangl
Institute of Electrical Measurement and Measurement Signal Processing, Graz University of Technology, Graz, Austria

This paper presents an analysis of a measurement principle for the determination of the mass flow of material through screw conveyors. The flow sensor design is based on capacitive sensing with the characteristic that the pipe content can be analyzed in a spatially resolving manner. Finite Element Analysis is used to investigate the sensor head and to estimate the performance of the sensor. The ...

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