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 Lithium-Ion Battery Cell Discharge Characteristics

Z. Umar[1], D. Ledwoch[1], L. Komsiyska[1], S. Vasić[[1]
[1]EWE-Forschungszentrum für Energietechnologie e. V, Oldenburg, Germany

In general battery cells are charged/discharged using constant current or constant power expressed as C-Rates and P-Rates respectively. We are developing a single cell-level Li-Ion battery model in order to simulate the performance and the physicochemical phenomena under power discharging mode (P-Rate). The P-Rate is defined as the measure of the rate at which a battery charges/discharges ...

Quench Propagation in 1-D and 2-D Models of High Current Superconductors

G. Volpini[1]
[1]LASA Lab., Milan Dept., Istituto Nazionale di Fisica Nucleare, Milano, Italy

The understanding of quench, or the sudden transition to the normal state of a high-current Superconductor (SC), is fundamental for the design of a SC magnet, and it is widely discussed in the literature. This paper presents some simple COMSOL models, which are compared with well-known approximate formulae and some experimental results. These models allow a more precise description than it is ...

Compressional Waves Generation in Droplets of Water Deposited on a Quartz Crystal

G. Couturier, R. Boisgard, C. Jai, and J.P. Aimé
Université Bordeaux

In this paper, we investigate the compressional wave generation in droplets and use different techniques to correlate the compressional wave generation to the shape of the droplets. Results show a good correlation between eigenmodes predicted by the theory and those experimentally observed.

Finite Element Analysis of Electro-mechanical Deflection of Cantilevers for SPM and MEMS Applications

D. Moro, and G. Valdrè
University of Bologna

The understanding of the distribution of electrostatic forces at the nanoscale is of fundamental importance for the development of nanotechnology. In this work, in order to quantify the EFM cantilever/tip-sample interaction, we present a 3D static Finite Element Analysis of the electromechanical interaction between conductive probes and samples, using COMSOL Multiphysics. The simulation ...

Benchmarking COMSOL - Part 2: CFD Problems

Darrell Pepper
Professor of Mechanical Engineering,
University of Nevada - Las Vegas

Using COMSOL 3.5a, a set of benchmark problems requiring the use of the COMSOL Computational Fluid Dynamics (CFD) module has been simulated. Several of the problems include fluid-heat transfer interactions (Computational Heat Transfer - CHT). The four problems are: flow over a 2-D circular cylinder compressible flow in a shock tube incompressible heated flow over a 2-D backward facing step ...

Stability and Bifurcation of Cathode Arc Attachment in AC Operated High-Intensity Discharge Lamps

A. Lenef
Osram Sylvania

High-intensity discharge (HID) lamps are highly-efficient light sources with many applications. Depending on the dimensions of the electrode, lamp current, and waveforms, the plasma may attach to the cathode in a diffuse mode, that covers the electrode tip surface, or a localized mode where heating and current transfer occur in a local region of the electrode surface. The localized mode is ...

Planar Geometry Ferrofluid Flows in Spatially Uniform Sinusoidally Time-Varying Magnetic Fields

S. Khushrushahi, A. Weddemann, Y. Kim, and M. Zahn
Massachusetts Institute of Technology
Cambridge, MA

Prior work has analyzed the case of planar Poiseuille ferrofluid flows in planar ducts stressed by uniform sinusoidally applied fields transverse and perpendicular to the duct axis. The coupled linear and angular momentum conservation equations with imposed magnetic flux density, Bx and magnetic field Hz result in a fourth-order system that was numerically solved using the shooting method in ...

Modeling Partially Absorbing Biosensors

D. Kappe[1], A. Hütten[1]
[1]Bielefeld University, Bielefeld, Germany

Designing and constructing a lab-on-a-chip device poses a variety of questions. Transport of all required substances, detection of the analyte and its deposition on a sensor have to be incorporated. Different strategies have been developed to achieve good coverages of the sensor, like employing electric or magnetic gradients. On the basis of a ramp like structure, the binding of the analyte to a ...

Modeling of Coupled Mass and Heat Transfer and Expansion During Baking of Bread in a Mould

V. Nicolas[1], C. Doursat[2], D. Grenier[1], T. Lucas[1], D. Flick[2]
[1]Institut de recherche en sciences et technologies pour l'environnement et l'agriculture, Rennes, France
[2]AgroParisTech, UMR1145 Ingénierie Procédés Aliments, Massy, France

Bread is a food product which various complex physico-chemical phenomena occur during the cooking process. Thus, phenomena of heat and mass transfer are coupled to the deformation. In addition, bread is a multiphase product (solid, liquid and vapor) and composed of various components (dry matter, water, air and carbon dioxide). A 2D model is developed with COMSOL Multiphysics® 4.3b witch ...

Optimization of a Rotor Shape for Spherical Actuator with Magnetically Levitating Rotor to Match Octupole Field Distribution

M. Sidz[1], R. Wawrzaszek[1], L. Rossini[2], A. Boletis[3], S. Mingard[3], K. Seweryn[1], E. Onillon[2], M. Strumik[1]
[1]Space Research Centre of PAS, Warsaw, Poland
[2]CSEM Centre Suisse d’Electronique et de Microtechnique SA, Neuchâtel, Switzerland
[3]Maxon Motor AG, Sachseln, Switzerland

The use of a reaction sphere as an actuator used by satellite Attitude Control System was proposed over twenty years ago. In principle this concept assumes the use of a single reaction sphere which can be accelerated in any direction instead of a set of reaction wheels. The solution discussed in this work has been proposed and patented by CSEM company. Contrary to conventional ball bearing ...

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