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.

Patient-specific Modelling of Blood-flow in Cerebral Aneurysms

D. Zajarias-Fainsod[1], M.J. Chappell[1], J.F. Collingwood[1], A. Rennie[2], S. Nagaraja[2], and A. Wilson[2]
[1]University of Warwick, Coventry, UK,
[2]University Hospital Coventry and Warwickshire NHS Trust, Coventry, UK

A first stage in this research was to determine the feasibility of patient-specific modelling and the use of in-silico techniques to study flow for the first time in the same vessels with and without an aneurysm. Three-dimensional renderings of the cerebral blood vessels were reconstructed from computed tomography angiograms of the head using MATLAB (The MathWorks) for image processing and ...

Dielectric Stress and Coordination Study in the PAB72 High Voltage Circuit Breaker Interrupter

D. Andrade, and D. Schiffabuer
Pennsylvania Breaker LLC, Canonsburg, PA, USA

Pennsylvania Breaker presents a dielectric stress study for its 72kV class breaker. This study was instrumental in the design and testing procedures during the research and development phase. COMSOL was incorporated into the design pipeline as an important tool for rapid reference of complicated and costly steady state electric cases. The purpose of this study was to develop a robust geometric ...

Ionic Current Through Carbon Nanotubes

J.H. Park, and P. Krstic
Oak Ridge National Laboratory, Oak Ridge, TN, USA

Ionic current through an electrolyte filling a carbon nanotube (CNT) is characterized by unusually high current values, due to the strong slip of the fluid at the inner surface of the nanotube, as well as of a dominating role of electro-osmotic component. Using COMSOL, we explore the fundamental features of this phenomenon with respect to the CNT length and excess charge inside the tube. COMSOL ...

Modeling a Focused Microwave System for Transcutaneous Thermal Therapy of Breast Cancer

J. Stang, B. Fowlkes, M. Moghaddam, O. Kripfgans, and P. Carson
University of Michigan, Ann Arbor, MI, USA

A transcutaneous thermal therapy system is being developed for the targeted treatment of breast cancer cells using focused microwaves as an adjuvant to surgery, radiation, chemotherapy, and high intensity focused ultrasound (HIFU). Prior imaging studies are used to ascertain the material properties of the breast tissue, and this data is incorporated into a COMSOL Multiphysics model. Time ...

Energy Harvesting for Microid Microrobots: a Computational Study

J.V. Clark, F. Li, and A. Shankar
Purdue University, West Lafayette, IN, USA

In this paper we present a computational study on energy harvesting for microid microrobots. We examine the feasibility of extracting energy from the ambient environment through the piezoelectric legs of the microid. Microids are microrobots that have insect like dexterity. The microid’s use in remote locations makes it imperative for it to be able to recharge itself. Clark et al. presented a ...

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, UniversitĂ  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 ...

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