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.

Reliability Screening Test for Metal Foil Resistors

A. Cyganowski[1], H. Leidecker[2], J. Brusse[2], L. Panashchenko[2], and T.E. Schmidt[3]
[1]Rensselaer Polytechnic Institute, Troy, NY, USA
[2]NASA Goddard Space Flight Center, Greenbelt, MD, USA
[3]St. Mary's College of Maryland, St. Mary's City, MD, USA

Metal foil resistors are often chosen for NASA space flight applications due to their high precision and stability. COMSOL Multiphysics is used to develop a test that screens out metal foil resistors containing gridline defects. The resistors will be subjected to repeated short duration electrical pulses that induce localized heating and fatigue only in areas with constrained gridlines. The pulse ...

SAW Sensor

S. Liu, P. Wang, and H. Sun
University of Massachusetts Lowell, Lowell, MA, USA

In this paper we study the porous media coating (PMC) effect on the surface acoustic wave (SAW) sensor for chemical detection. Intensive research for SAW sensor is focused on using high surface polymer coating such as nanofibrous film to improve the sensitivity and to shorten response time for in situ trace level detections. A theoretical analysis shows the PMC can provide a higher and faster ...

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 ...

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