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.

Simulating Experimental Conditions of the HIIPER Space Propulsion Device

A. Krishnamurthy[1], G. Chen[1], B. Ulmen[1], D. Ahern[1], G. Miley[1]
[1]University of Illinois at Urbana - Champaign, Urbana, IL, USA

The Helicon-Injected Inertial Plasma Electrostatic Rocket (HIIPER) is a two-stage electric propulsion system comprising of a helicon plasma source and an inertial electrostatic confinement (IEC) device for plasma production and acceleration, respectively. Several diagnostics such as a Faraday cup, spherical Langmuir probe, and gridded energy analyzer have been developed for analyzing various ...

2D Simulation of Cardiac Tissue - new

S. Esfahani[1]
[1]University of South Florida, Tampa, FL, USA

A two-dimensional atrial tissue model has been constructed in COMSOL Multiphysics® software to study the propagation of action potential and electrograms. The model presents the atrial electrograms recorded with a mapping catheter. A 2D atrial tissue model is simulated using the Courtemanche et al. cell model equations. PDE in coefficient form was used in COMSOL Multiphysics® to reproduce the ...

Multiscale Electromagnetic Modeling of Contractions in the Pregnant Uterus - new

V. Tidwell[1], P. LaRosa[2], M. Zhang[1], H. Eswaran[3], A. Nehorai[1]
[1]Department of Electrical & Systems Engineering, Washington University in St. Louis, St. Louis, MO, USA
[2]Monsanto Company, Technology Pipeline Solutions, St. Louis, MO, USA
[3]OB/GYN Department, University of Arkansas for Medical Sciences, Little Rock, AR, USA

Uterine contractions during pregnancy are currently poorly understood – experts disagree on the mechanisms by which contractions propagate through the organ and the structural layout of the uterine muscle fibers. We have developed a multi-scale model of the uterus, at the cellular, tissue, and organ levels. By comparing simulated abdomen-level magnetic field readings from our model to clinical ...

Creep Deformation Behavior of Heating Filaments in High Temperature Applications

B. Valentini [1],
[1] Plansee SE, Reutte, Austria

Resistive heating filaments used in high temperature applications at 2000°C and above are often made of refractory metals. The lifetime of such filaments is mainly limited by creep deformations which can in the worst case lead to a short circuit between filaments and other furnace components. With the aid of COMSOL Multiphysics software, the time-dependent creep deformation behavior of a heater ...

Simulation of a Rotary Magnetorheological Damper

D. Harder [1], L. Fromme [1], R. Naumann [2],
[1] University of Applied Sciences Bielefeld, Department of Engineering Sciences and Mathematics, Bielefeld, Germany
[2] University of Applied Sciences Bielefeld, ISyM – Institute of System Dynamics and Mechatronics, Bielefeld, Germany

This paper presents a simulation model of a rotary damper filled with a magnetorheological fluid (MRF). The most important characteristic of the MRF is the variable viscosity, which can be controlled by an external magnetic field. In the simulation model, the fluid is described as a Bingham fluid model which is coupled to an electromagnetic field simulation to analyze the damping characteristic ...

Using COMSOL Multiphysics in Eddy Current Non Destructive Testing Context

L. Santandrea, and Y. Le Bihan
Laboratoire de Génie Electrique de Paris, Gif-sur-Yvette, France

Eddy current testing (ECT) is widely used to check the integrity of electrically conducting parts and notably to detect flaws. It is based on the interaction between a probe and the part under testing. The finite element method (FEM) is well fitted to the modelling of these kinds of problems because of its large flexibility which allows to deal with complex probe and part configurations. In this ...

COMSOL Aided Design of an Extraction Pipe for the Electron Beam from a Plasma Focus Device

M. Valentinuzzi[1], E. Ceccolini[1], D. Mostacci[1], M. Sumini[1], F. Rocchi[2]
[1]Montecuccolino Nuclear Engineering Laboratory, University of Bologna, Bologna, Italy
[2]UTFISSM-PRONOC, ENEA, Bologna, Italy

The electron beam emitted backward by Plasma Focus devices is being investigated as a radiation source for IORT (Intra-Operative Radiation Therapy) applications. A Plasma Focus device is being developed to this aim. The electron beam is driven through an electron pipe made of stainless steel to impinge on a 50 ?m brass foil, where conversion X-rays are generated. Electromagnetic forces in the ...

Multi-Layers Surface Coil Design: Geometry Optimization - new

S. Aissani[1], L. Guendouz[2]
[1]CRM2, Institut Jean Barriol, University of Lorraine, Vandoeuvre-lès-Nancy, France
[2]Mesures et architectures électroniques, University of Lorraine, Vandoeuvre-lès-Nancy, France

Nuclear Quadrupole Resonance (RQN) is a radio frequency (RF) spectroscopic technique that is used to detect quadrupole nuclei such as Nitrogen-14. NQR was found to be a good candidate for detecting narcotics, explosives and medicines [1]. However, due to its low sensitivity the use of NQR is still limited. One way to increase the sensitivity is to improve the RF coil by means of a better RF ...

Prediction of Magnetic Fields, Eddy Currents, and Loads in a Tokamak During a Disruption for Alcator C-Mod's Advanced Outer Divertor - new

J. Doody[1], B. Lipschultz[2], R. Granetz[1], W. Beck[1], L. Zhou[1], J. Irby[1]
[1]Massachusetts Institute of Technology, Plasma Science and Fusion Center, Cambridge, MA, USA
[2]York Plasma Institute, University of York, Heslington, York, UK

COMSOL Multiphysics® has been used to predict the magnetic fields, eddy current, lorenz forces and stresses during a disruption for the new Advanced Outer Divertor for the Alcator C-Mod tokamak. A tokamak is used to study magnetic confinement of plasma for fusion, and a disruption occurs when the plasma decays, rapidly losing all of its current. COMSOL has been used to recreate the fields ...

Finite Element Modeling of Eddy Current Probes for CANDU® Fuel Channel Inspection

M. S. Luloff [1], T. W. Krause [2], J. Morelli [1],
[1] Queen's University, Kingston, ON, Canada
[2] Royal Military College of Canada, Kingston, ON, Canada

CANDU® reactor pressure tubes (PT) contain D2O, which is used as a moderator. Surrounding the PTs are gas-filled Calandria Tubes (CT), which thermally isolate the PTs from the moderator surrounding the fuel channels. If the garter springs move apart, the PT will sag into the CT. Under contact conditions, the thermal gradient between the hot PT and cold CT accelerates the ingress of deuterium ...