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 simulations of heat effects compared to measurements in III-V semiconductor saturable absorbers.

LePaul, S., Yang, N., Aniel, F.
Institut d’Electronique Fondamentale, Université Paris XI – CNRS UMR 8622, Orsay

The major purpose of this communication is to share our experiences on the numerical difficulties we ended up in simulating heating effects of saturable absorbers based on III-V semiconductors with the commercial finite element software FEMLAB 3.1. Saturable absorbers are devices devoted to full optical signal regeneration in optical telecom systems. The self heating effects in the structures ...

Flow behaviour of phosphorus-deoxidised copper in plane-strain hot extrusion

Jin, L.Z.1, Ssemakula, H.2, Sandström, R.1
1 Department of Materials Science and Engineering, Royal Institute of Technology, Sweden
2 Department of Production Engineering, Royal Institute of Technology, Sweden

Flow behaviour of phosphorus-deoxidised copper in plane-strain hot extrusion with an insertion in the die has been studied through a finite-element model consisting of fluid dynamics and heat transfer approaches. The billet material is considered as rigid-visco-plastic and rate-sensitive. A dynamic viscosity, which is strain-rate and temperature dependent, has been integrated into the model. ...

Simulation of Convection in Water Phantom Induced by Periodic Radiation Heating

H.H. Chen-Mayer[1], and R. Tosh[1]
[1]Ionizing Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USA

Water calorimetry is employed to establish a primary reference standard for radiation dosimetry by measuring the temperature rises in a water phantom (a cube of about 30 cm x 30 cm x 30 cm) subjected to a beam of ionizing radiation.  We use COMSOL Multiphysics to model the system using the Heat Transfer module and the Incompressible Navier-Stokes module with a geometry of 2D-axial ...

Gas Permeation Laboratory Experiment Simulation for Improved Learning

J. Lebowitz, and W.M. Clark
Worcester Polytechnic Institute

We are testing the hypothesis that the simulation of laboratory equipment will solidify the link between experiment and theory and provide improved learning for senior chemical engineering undergraduates. We developed a simulation of an industrially important gas permeation experiment in which air is separated into an oxygen-rich stream and an oxygen-depleted stream using a hollow fiber ...

Flow Analysis for a Sorghum Brewing Fermentation Process

T.A. Owosina
Simulo Technologies, Lagos, Nigeria

A qualitative flow analysis by numerical simulation of a fermentation process in a sorghum factory is presented. The simulations were done with the Numerical modeling software, COMSOL Multiphysics. Several flow arrangements were considered in the study and as a result, optimized flow configurations were evolved.

Modelling of the Hydrogen Diffusion in Martensitic Steel in Contact with H2SO4 Media

J. Bouhattate[1], X. Feaugas[1], and S. Frappart[1][2]
[1]Laboratoire d’Etudes des Matériaux en Milieux Agressifs,
Université de La Rochelle, La Rochelle, France
[2]V&M France, CEV, Aulnoye-Aymeries, France

Hydrogen Embrittlement (HE) is one of the mechanisms responsible for premature failure of structures. In the context of environmental sustainability, it is compelling to improve or conceive new processes and/or new materials capable of reducing fracture induced by HE. We analyzed the influence of the oxide layer on the permeability of hydrogen. This investigation was carried on as a correlative ...

Modeling Two-Phase Electrophoresis

W. Clark[1], and M. Lindblad[1]
[1]Chemical Engineering Department, Worcester Polytechnic Institute, Worcester, Massachusetts, USA

Two-phase electrophoresis is a separation method that combines aqueous two-phase partitioning with electrophoresis and has promise for large scale recovery of biological products. Aqueous two-phase systems formed by adding two polymers, like dextran and polyethylene glycol, to water provide some separation of dissolved species due to differences in solubility of solutes between the phases. COMSOL ...

Wall Effects in Convective Heat Transfer from a Sphere to Power Law Fluids in Tubes

D. Song[1], R. Gupta[1], and Chhabra[2]

[1]West Virginia University, Morgantown, West Virginia, USA
[2]Indian Institute of Technology, Kanpur, India

Heat transfer from a sphere having a uniform temperature and falling axially in a cylindrical tube filled with an incompressible power-law liquid is numerically investigated. The governing equations for simultaneous flow around a confined sphere and heat transfer to power-law fluids were solved numerically using COMSOL Multiphysics. It was found that the wall effects on the mean Nusselt number ...

COMSOL Implementation of Valet-Fert Model for CPP GMR devices

T. Xu[1], C.K.A. Mewes[1], S. Gupta[2], and W.H. Butler[1]
[1]Department of Physics and Astronomy and Center for Materials for Information Technology, University of Alabama, Tuscaloosa, Alabama, USA
[2]Department of Metallurgical and Materials Engineering and Center for Materials for Information Technology, University of Alabama, Tuscaloosa, Alabama, USA

The Giant Magneto Resistance (GMR) effect is a quantum mechanical effect which can be observed in systems consisting of thin alternating ferromagnetic and non-ferromagnetic layers. Simulation using COMSOL allows the evaluation of the magneto-resistance ratio and the electrical resistances of realistic CPP-GMR devices and opens the possibility to study new device materials and designs.

Simulation of Electromagnetic Stirrers and Brakes Applied in the Metallurgical Field

C. Mapelli
Politecnico di Milano

The control of the flux within continuous casting systems used in the metallurgical field can be obtained through the application of electromagnetic. The model here has been solved through a linear time-harmonic solver. The results of the electromagnetic model have then been applied to the fluid-mechanics model through volume Lorentz forces.

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