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.

Study of a Silicon Photodetector Thermal Stabilization using a Peltier Cell

E. Foschi1, C. Guandalini2, G. Levi1, L. Quadrani1, C. Sbarra 1,3, and M. Zuffa2
1Department of Physics, University and INFN, Bologna, Italy
2INFN, Bologna, Italy
3Centro Studi e Ricerche E.Fermi, Roma, Italy

In recent years, a new type of silicon photon detection devices (SiPM) has been developed. These devices have advantages in comparison to normal photomultiplier tubes (PMT), but being made by an array of avalanche photo diodes operated in Geiger mode, they are much more sensitive to temperature changes than standard PMTs. Typical SiPM gains vary from 3 to 5 percent per degree Centigrade. In space ...

A Highly Effective Cellular Manipulation and Sorting Platform

A. Kose, B. Fischer, and H. Koser
Electrical Engineering Department, Yale University, New Haven, CT, USA

Ferrofluids are stable colloidal suspensions of nanosize magnetic particles in an organic or aqueous medium. Suspending nonmagnetic particles within a ferrofluid has led to numerous new areas of study. The simultaneous action of magnetic and hydrodynamic forces is responsible for the complex behavior of nonmagnetic particles within ferrofluids. As a result of nonzero fluid magnetization, a ...

Computation of Airfoils at Very Low Reynolds Numbers

D. Bichsel1, and P. Wittwer2
1HESSO, Ecole d'Ingénieurs de Genève, Geneva, Switzerland
2DPT, Université de Genève, Geneva, Switzerland

We discuss a new numerical scheme involving adaptive boundary conditions which allows to compute, at very low Reynolds numbers, drag and lift of airfoils with rough surfaces; efficiently and with great precision.As an example, we present the numerical implementation for an airfoil consisting of a line segment. The solution of the Navier-Stokes equations is singular at the leading and trailing ...

Modeling Nanoscale Heat Flow

S. Palaich, and B. Daly
Physics and Astronomy Department, Vassar College, Poughkeepsie, NY, USA

When the dimensions of the material approach is a comparable size to the phonon mean free path, heat flow enters a new regime, the nanoscale. The Fourier and Cattaneo Equations describe bulk heat flow well, but radiative boundary terms must be considered when modeling nanoscale heat flow. We take these equations and input them into COMSOL with the hope of eventually linking nanoscale and bulk ...

COMSOL Grab Bag: How to Use a Versatile CFD Code to Model Interesting Problems from Cryogenic Storage to Biofuel Production

Emily Nelson
Senior Research Engineer,
NASA Glenn Research Center, Cleveland, OH, USA

Emily Nelson received her PhD in Mechanical Engineering from the University of California at Berkeley. She is a senior research engineer at NASA Glenn Research Center and specializes in the formulation and solution of problems in microgravity science, multiphase flow, porous media, risk analysis, and gravitational biology. This leads her to fundamental and applied approaches on a range of issues ...

Capacitance Computation of Multilayered and Multiconductor Interconnects Using Finite Element Method

S. Musa, and M. Sadiku
College of Engineering, Prairie View A&M University, Prairie View, TX, USA

The development and analysis of interconnects in inhomogeneous structures such as very large scale integration chips, printed circuit boards, and multichip modules are essential for next-generation electronic products. In this paper, we illustrate fast and sufficiently accurate computation of capacitance matrices of multilayered and multiconductor interconnects applying the finite element ...

Numerical Analysis of the Impact of Geometric Shape Patterns on the Performance of Miniaturized Chromatography Systems

R. Winz[1], E. von Lieres[2], and W. Wiechert[1]
[1]Department of Simulation, University of Siegen, Siegen, Germany
[2]Institute of Biotechnology, Research Centre Jülich, Siegen, Germany

We have implemented a two dimensional chromatography model for the analysis and optimization of structured micro pillar arrays. Dynamic surface interaction of solved molecules is taken into account by the kinetic Langmuir model. Variations of the pillar array geometry lead to deviations in the outlet concentration profiles. These deviations cannot be described by the one dimensional models that ...

Multiphysics Modeling of Engineered Structured Sorbents for the Adsorption of Carbon Dioxide and Water Vapor from Manned Spacecraft Atmospheres

J. Knox
NASA, Huntsville, AL, USA

In NASA’s Vision for Space Exploration, humans will once again travel beyond the confines of earth’s gravity, this time to remain there for extended periods. Thus all spacecraft systems, including those for the separation of metabolic carbon dioxide and water from a crewed vehicle, must be minimized with respect to mass, power, and volume. This paper describes efforts to improve on ...

Linear Water Wave Propagation around Structures

L. Martinelli, and A. Lamberti
Universita di Bologna, Italy

Objective of this contribution is to show how to implement the Mild Slope Equations with COMSOL Multiphysics. These equations are commonly used to study the propagation of waves in harbors. Some interesting features are presented, namely the use of weak terms (used for the modelling of the source term); the evaluation of a smooth phase gradient from the complex dependent variable; a robust ...

A Mean Field Approach to Many-particles Effects in Dielectrophoresis

O. Nicotra, and A. La Magna
CNR-IMM Sezione di Catania, Catania, Italy

One of the major applications for dielectrophoresis is the selective trapping and fractionation in lab-on-a-chip devices. Nevertheless, many-particle effects due to high concentrations of biological material around electrodes can cause a rapid decrease of trapping efficiency in dielectrophoretic devices. In this contribution we present a new approach based on a drift-diffusion dynamics to study ...

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