Artigos Técnicos e Apresentações

Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abramgem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

Analysis Of The Design Criteria For Ancient Greek And Roman Catapults

K.M. Paasch
Center for Product Development, Mads Clausen Institute, South Danish University, Denmark

This paper will give a short overview of use of COMSOL Multiphysics for analyzing ancient Greek and Roman catapults with the main focus on the energy storing torsion springs. Catapults have been known and used in the Greek and Roman world from around 399 BC and a fully standardized design for powerful torsion catapults emerged around 270 BC, based on one basic factor, the diameter of the torsion ...

The GEM Technology for the SBS at Jefferson Lab

F. Noto[1], V. Bellini[1], E. Cisbani[2], and C. Sutera[1]
[1]INFN Sez. di catania, Università di Catania, Italy
[2]INFN Sez. Roma, Italy

The Gas Electron Multiplier (GEM) technology has proven to tolerate rate up to 50 MHz/cm2 without noticeable aging and to provide the required resolution on working chambers up to 33x33 cm2. The SBS GEM chambers have been designed in a modular way: each chamber consists of 3 adjacent GEM modules. Each GEM module has an active area of 40x50 cm2, which 2 represent the current standard double mask ...

Finite Element Modelling For Optimizing A Hyphenated Rheometer/Calorimeter

C. Block[1], B. Van Mele[1], and V. Janssens[2], P. Van Puyvelde[2], and G. Van Assche[1]
[1]Vrije Universiteit Brussel, Physical Chemistry and Polymer Science, Brussels, Belgium
[2]Catholic University of Leuven, Lab of Applied Rheology and Polymer Technology, Heverlee, Belgium

COMSOL is used for optimization of the design of a novel analytical technique, RheoDSC, which combines a rheological and a calorimetric measurement on one sample. A rheological experiment is performed on a sample positioned on a DSC sensor in a DSC instrument. DSC is used to study transition enthalpies and heat capacity in isothermal and non-isothermal conditions. The working principle of a ...

Electromagnetic Shielding of Impulse Magnetic Fields Using Thin-Walled Shells

O. Skoblikov
R&D Institute "Molniya"
National Technical University
Kharkiv, Ukraine

Aiming at meeting novel customers\' requirements many companies worldwide design and produce new aircrafts for public, cargo and other special transportations. In order to be legally exploited, a flying machine has to fulfill a number of different, foremost safety, requirements. One of such demands is EMC of the on-board electrical and electronic systems, namely the stability of the equipment ...

Finite Element Modelling of Fireballs in Low Pressure Gas Discharges

C. Speer, J. Gruenwald, J. Seebacher, and A. Kendl
University of Innsbruck
Institute for Ion Physics and Applied Physics
Innsbruck, Austria

In the Double-Plasma (DP) device at Innsbruck University the formation of plasma fireballs is investigated. Under certain conditions such a fireball evolves in front of a positively biased electrode, which is surrounded by a weakly ionized background plasma. A complete theoretical model is up to now not available. In the present work the current experimental set up at Innsbruck University has ...

Fluid Memory for Particles in 2D Brownian Motion

S. Wolf, and J. Czerwinska
ARTORG Center
University of Bern
Bern, Switzerland

Thermal fluctuations of microparticles are an important way of transport in biological cells. While the fluid properties, such as viscosity, cannot always be directly measured, the random path of a microparticle can be observed under microscope. The relation between the diffusion and the fluid viscosity is analytically well described for spherical particles. Therefore, we have simulated and ...

Investigation on Numerical Modeling Aspects of Hydraulic Fracturing

C. Vinci, J. Renner, and H. Steeb
Ruhr-Universität Bochum
Bochum, Germany

During hydraulic fracturing processes, several coupled mechanical and hydraulical phenomena take place. We investigate an elastically deformable fluid-filled fracture embedded in a porous rock matrix. Despite the substantial number of previous modeling approaches, a clear insight into the numerical solution procedure of high pressure fluid injection in a fracture has not been gained. We use ...

Multiscale Hemodynamic Modeling of the Intrarenal Circulation

K. M'rabet Bensalah[1], J. Czerwinska[2], D. Uehlinger[3], R. Kalicki[3]
[1]University of Bern, Faculty of Medicine, Bern, Switzerland
[2]ARTORG Center for Biomedical Egineering Research, Artificial Kidney Research, Bern, Switzerland
[3]University Hospital of Bern, Department of Nephrology and Hypertension, Bern, Switzerland

In silico research is gaining interest in the medical field. Simulating the renal circulation is a very challenging and exciting task due to the high morphological and functional complexity of this system. In numerous renal diseases the underlying pathomechanism as well as the primary and secondary damages, concern the vascular system. A better understanding of the local hemodynamics will ...

Modeling and 2-D FE-simulation of Vortex Ripples Using a Three-phase Mixture Approach

T. Reisner[1], H. Steeb[1], and J. Renner[2]
[1]Institute of Mechanics - Continuum Mechanics, Ruhr-University Bochum, Bochum, Germany
[2]Institute of Geology, Mineralogy and Geophysics, Ruhr-University Bochum, Bochum, Germany

A new continuum-mechanical model for the study of sediment erosion, transport and deposition was developed using a three-phase mixture approach. It differs from existing two-phase models in that the sediment is modeled as two different phases, rigid sediment bed and mobile particles, instead of one phase. The model is currently implemented into Comsol Multiphysics using the Mixture Model and ...

Numerical Investigation on the Electrolyte (PBI/H3PO4) Management of a HT-PEM Fuel Cell

M. J. Hampe, S. Lang, H. Löhn, and T. Zeeden
Technische Universität Darmstadt
Fachgebiet Thermische Verfahrenstechnik
Darmstadt, Germany

PEM fuel cells based on Polybenzimidazole doped with phosphoric acid show many benefits in comparison to conventional perfluorinated sulfocationic membrane materials, but they suffer from a degradation partially caused by the loss of electrolyte. The first step to tackle this degradation problem is to understand the electrolyte management in high temperature PEMFCs. COMSOL 4.1 was used to ...

Quick Search

3171 - 3180 of 3230 First | < Previous | Next > | Last