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.

Computational Modeling to Study the Treatment of Cardiac Arrhythmias using Radiofrequency Ablation

A. González-Suárez[1], M. Trujillo[2], J. Koruth[3], A. D'Avila[3], E. Berjano[1]
[1]Biomedical Synergy, Electronic Engineering Department,Universitat Politècnica de Valencia, Valencia, Spain
[2]Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de Valencia, Valencia, Spain
[3]Helmsley Cardiac Electrophysiology Center, Mt SinaiMedicalCenter and School of Medicine, New York, NY, USA

Previous studies proposed using bipolar radiofrequency ablation across two catheters placed on opposing surfaces of the ventricular wall to create transmural lesions. 2D and 3D models were built and solved with COMSOL Multiphysics software. With these models, it was possible to study the temperature distribution and lesion geometry (Figure), to compare the potential of two ways of applying ...

Simulations of Heat and Mass Transport During Biomass Conversion Processes Using 3D Biomass Particle Models with Realistic Morphology and Resolved Microstructure

P. Ciesielski[1], M. Crowley[1], L. Thompson[1], B. Donohoe[1], D. Robichaud[2], A. Sanders[3], M. Nimlos[2], T. Foust[2]
[1]Biosciences Center, National Renewable Energy Laboratory, Golden, CO, USA
[2]National Bioenergy Center, National Renewable Energy Laboratory, Golden, CO, USA
[3]Quantum Electronics & Photonics Division, National Institute of Standards & Technology, Boulder, CO, USA

Predictive simulations of biomass conversion processes will improve their technical performance and reduce economic uncertainty surrounding industrialization of biofuels production. The majority of present conversion simulations treat the biomass feedstock with simplifying assumptions that neglect important characteristics that are unique to biomass particles. These characteristics, including ...

Modeling Bioclogging Effects in Constructed Wetlands for Wastewater Treatment

R. Samso[1], N. Forquet[2], P. Molle[2], J. Garcia[1]
[1]Department of Hydraulic, Maritime and Environmental Engineering, Universitat Politècnica de Catalunya-BarcelonaTech, Barcelona, Spain
[2]IRSTEA, Freshwater Systems, Ecology and Pollution Research Unit, Villeurbanne, France

Horizontal-Flow Constructed Wetlands (HFCWs) are a particular type of biofilter, and as such they rely mostly on the activity of bacterial communities to treat wastewater. Bacterial growth in HFCWs induces dramatic changes in its hydraulic and hydrodynamic behaviour (bioclogging), which may eventually result in overland flow of wastewater. Consequently, clogging is the main cause of premature ...

Estudo Numérico da Eletroquimioterapia em Tumor Cutâneo com Diferentes Configurações de Eletrodos

G. Neves[1], D. Suzuki[1], J. Alvim[1], M. Rangel[2]
[1]Universidade Federal de Santa Catarina, Florianópolis, SC, Brasil
[2]Vet Câncer Oncologia Veterinária, São Paulo, SP, Brasil

A eletroquimioterapia é um tratamento de câncer que utiliza a combinação de agentes quimioterápicos e campos elétricos. A base teórica por trás dessa aplicação é a eletroporação. Esse fenômeno biológico consiste na abertura de poros na membrana celular devido à aplicação de pulsos elétricos. Este trabalho analisa o comportamento do campo elétrico gerado por pulsos ...

Comparative Study on 3D Modeling of Breast Cancer Using NIR-FDOT - new

S. Peter[1]
[1]Christ University, Bengaluru, Karnataka, India

Fluorescence Diffuse Optical Tomography (FDOT) uses Near Infra-Red (NIR) light to monitor physiological changes in internal organs. NIR light being less energetic in nature can be used for continuous monitoring of tumor infected biological tissue, neonatal brain and many such applications where high energy radiation can cause severe damage. In this paper, a comparative study on the 3D modeling ...

Image-Based Simulation of Electrical Impedance Techniques Applied on the Human Thorax for Cardio-Pulmonary Applications

F.K. Hermans[1], R.M. Heethaar[1], R.T. Cotton[2], and A. Harkara[2]

[1]VU University Medical Center, Amsterdam, The Netherlands
[2]Simpleware Ltd., Exeter, United Kingdom

For medical diagnostic purposes there is an increasing need for non- (or minimal) invasive techniques to measure all kinds of parameters that can provide insight in the functioning of cells, organs or organ systems. Currently, Impedance Cardiography (ICG) is used for measurements of the heart and Electric Impedance Tomography (EIT) is used for investigating lung tissue condition. This paper ...

Magnetic Liquids for Lab-on-a-chip and Rapid Diagnostics Applications

H. Köser
Yale University

In this presentation we outline our recent work on Magnetic Liquids, and the great number of application areas these are used. Ferrofluids are nanometer sized magnetic particles, covered by a surfactant, suspended in a carrier medium compatible with the surfactant material. Ferrofluids are applicable to a great and ever increasing number of application areas, such as: • Liquid Seals and ...

Analytical Methods for Reducing the Number of Independent Parameters Required to Model the Vocal Folds

D. D. Cook1, E. Nauman1, and L. Mongeau2
1Department of Mechanical Engineering, Purdue University, West Lafayette, IN, USA
2Department of Mechanical Engineering, McGill University, Montréal, QC, Canada

Mechanical tissue properties are required for reliable numerical models of the vocal folds. In this study, criteria for determining the compatibility of tissue property values obtained from independent studies are presented.Two methods for reducing the number of independent material parameters are given. The errors introduced by these assumptions were quantified by performing a modal analysis on ...

Validation of Measurement Strategies and Anisotropic Models Used in Electrical Reconstructions

R. Sadleir
Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA

We are developing approximations of electrically anisotropic materials for use in novel imaging methods. Our modeling work in COMSOL comprises comparisons of anisotropic and layered models in terms of electrical conductivities measured using different strategies. We tested solution stability in one anisotropic case by varying mesh anisotropy. In our case, good approximations to the true ...

Prediction of Time of Death Using a Heat Transport Model

J.L. Smart[1], and M. Kaliszan[2]
[1]University of Kentucky, Paducah, KY, USA
[2]Medical University of Gdansk, Gdansk, Poland

COMSOL Multiphysics® 4.0 was used to study conductive and convective heat transfer from the human eyeball to the surrounding air. Postmortem temperature decay curves were collected in eyeballs of numerous human corpses. Of course, these curves represent only a portion of the complete temperature decay curve, since the pathologist is able to start collecting temperature data only after some ...

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