Articles techniques et présentations

Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

COMSOL Multiphysics® Software: Time-Lapse Electrical Resistivity Inversion

T. K. Chou[1], M. Chouteau[1], M. J. Yi[2]
[1]Department of Civil, Geological & Mining Engineering, École Polytechnique de Montréal, Montreal, QC, Canada
[2]Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea

Time-lapse electrical resistivity tomography (ERT) method provides a non-invasive way to monitor subtle sub-surface changes caused by water flow such as in an infiltration test. Problems arise when the inversion models contain artifacts due to measurement errors, rapid change in soil electrical property during measurement time, etc. A new approach was developed by Kim et al. (2004) and (2009) ...

Conductivity Estimation of Breast Cancer Using COMSOL® Modeling of Microwave Scattering and Frechet Mean Estimate of Covariance

A. Jeremic[1], E. Khoshrowshahli[2]
[1]Electrical & Computer Engineering, McMaster University, Hamilton, ON, Canada
[2]Biomedical Engineering, McMaster University, Hamilton, ON, Canada

Breast cancer detection is one of the most important problems in health care and it is second most frequent cancer according to WHO. It is recommended that women over fifty or even younger in some cases do a screening test every two years. Besides clinical breast examination, there are number of imaging methods used for this purpose, such as mammography, ultrasound and MRI. Among them, ...

Numerical Simulation of Chamber Design for Pulsed Electric Fields Processing of Wet Olive Pomace

N. Varga[1], I. Perales[2], A. Portugal[2]
[1]ATEKNEA Solutions Hungary, Budapest, Hungary
[2]ATEKNEA Solutions Catalonia, Barcelona, Spain

The application of pulsed electric fields (PEF) is well known in the food industry as an advanced technology for mass transfer improvement. A new potential adaptation area of PEF could be extracting a valuable antioxidant called polyphenol from wet olive pomace (WOP) which is a by-product of olive oil production. The modelling includes the PEF effects on the WOP which is flowing through a ...

Dynamic Response Characteristics of a Novel Electrolyte Transistor

M. C. Hollenbeck1,2, H. Zohdy2,3, R. Brower2, R. Ewing2, and K. Stevens1
1University of Utah, Salt Lake City, UT, USA
2AFRL/IFTA, Wright Patterson, OH, USA
3Oakland University, Rochester, MI, USA

The research presented here shows a multiphysics model for a polymerelectrolyte transistor (PET) simulated in COMSOL Multiphysics.Dynamic transient response and current-voltage characteristics are determined from multiple simulations of an alkaline-acid-alkaline PET in a common collector configuration, showing transistor activity in the ionic currents of the device. This shows that increasing ...

Introduction to COMSOL based Modeling of Levitated Flywheel Rotor

A. Pilat
AGH University of Science and Technology
Kraków, Poland

This elaboration presents a pre-study on automatic rotor construction for the flywheel energy storage system dedicated to operate in the levitation mode. The optimization profile model is used as a basic profile source. The 3D flywheel shape is generated on the base of obtained profiles. Eigenfrequencies are calculated to validate the operation on rigid mode. A steel and aluminum based ...

Finite Element Analysis of Superconductive Tape by Using T-Ω Formulation

H. Arab[1], S. Memiaghe[1], C. Akyel[1]
[1]Ecole Polytechnique of Montreal, Montreal, QC, Canada

This paper deals with a numerical modelling technique based on finite elements method for computing magnetic field and current density distributions in high temperature Superconducting (HTS) tapes. The model is developed using the T-ῼ formulation for which the degree of freedom (DOF) and the CPU time decreased considerably in AC losses analysis, and it is also observe that T-ῼ formulation ...

Reliable Full-Wave EM Simulation of a Single-Layer SIW Interconnect with Transitions to Microstrip Lines

J. L. Chavez-Hurtado[1], J. E. Rayas-Sanchez[1], Z. Brito-Brito[1]
[1]ITESO - Universidad Jesuita de Guadalajara, Tlaquepaque, Jalisco, Mexico

We present a procedure to obtain reliable EM responses for a SIW interconnect with microstrip line transitions. The procedure focuses on two COMSOL® configuration settings: meshing size and simulation bounding box. Once both are properly configured, the implemented structure is tested by perturbing the simulation bounding box to ensure it has no effect on the EM responses.

Thermal and Electrical Investigation of Power Bus Cables for Industrial Applications

H. P. Schmidt
FH Amberg-Weiden, EI, Amberg

In materials handling decentralized automation is widely applied. Loads like variable speed drives are not radially fed but connected to a power bus. Furthermore power and data might be transmitted within one single cable. Here the need for thermal and electrical simulations arises.A model is derived to calculate the ampacity for various operating conditions and COMSOL is applied to determine ...

3D Semiconductor Radiation Detectors for Medical Imaging

M. Ruat, E. Gros d'Aillon, J. Tabary, and L. Verger
LETI-CEA Recherche technologique, MINATEC, Grenoble, France

CdTe and GaAs 3D semiconductor radiation detectors for medical imaging have been simulated. This was done through coupling Monte-Carlo simulations of interacting of X- and γ-rays with matter (using PENELOPE) while computating the applied potential, weighting field, free charge carriers transport and electrodes Charge Induction Efficiency (CIE) with COMSOL Multiphysics. Since the continuity ...

Muscle-Electrode Interface Simulation

A. Altamirano, C. Toledo, A. Vera, R. Muñoz, and L. Leija
Centro de Investigacion y Estudios Avanzados
Instituto Politecnico Nacional
Mexico

In this article, the aim is to study different types and forms of electromyography (EMG) electrodes, for bipolar configuration, and the electric interface with muscle phantom. COMSOL Multiphysics allows modeling shapes and contact surfaces. Surface and needle electrodes will be modeled. A number of different trials and combinations will be presented; exploring different geometric shapes and ...

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