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.

Dynamic adsorption with FEMLAB, modeling breakthrough curves of gaseous pollutants through activated carbon beds

Joly, A.1, Volpert, V.1, Perrard, A.2
1 Institut Camille Jordan (ICJ), CNRS UMR 5208, Mathématiques, Université Claude Bernard Lyon, Villeurbanne Cedex, France
2 Institut de Recherches sur la Catalyse, CNRS UPR 5401, Villeurbanne Cedex, France.

The purpose of this presentation is to expose how to apply FEMLAB to model the dynamic adsorption through adsorbent columns and to use the results of the numerical simulations to interpret the experiments. The mathematical formulation of the phenomena leads to a system of two partial differential equations (mass balance and adsorption rate), which can be solved in most cases only after ...

Finite Element Models for the Solution of Underwater Acoustics Problems

Zampolli, M., Tesei, A., Jensen, F.B.
NATO Undersea Research Centre, 19138 La Spezia, Italy

Acoustic waves are used in SONAR systems for the detection and classification of objects which may be swimming in the water column, proud on the seafloor, or buried below the sediment. In some applications, such as low frequency detection and classification of structurally complex objects immersed in a fluid, signal processing techniques must be aided by a-priori model based knowledge of the ...

An Integrated Approach for Simulating Bone Adaptation of Shape and Material Properties using FEMLAB with MATLAB and Simulink

Liu, X., Hart, R.T.
Tulane University, Department of Biomedical Engineering

A new computational approach for simulating bone adaptation was implemented using FEMLAB with MATLAB and Simulink. A Simulink model was created to describe shape adaptation of bone as a negative feedback system, in which the adaptation driving signals tend to return to an equilibrium range in which no shape adaptation will occur. FEMLAB was invoked using a MATLAB S-function in the Simulink ...

Parametric Analysis of Electric Field Distribution of Rat Vasculature using Finite Element Time Domain Technique

Chris Capaccio1, Nikolay Stoykov1, Fermin Cortes2,
A. Gutierrerz3,
Raji Sundararajan1,3, and David A. Dean1
1Northwestern University, 2University of Waterloo,
3Arizona State University

This paper deals with the study of the effects of tissue parameters, such as electrical conductivity and permittivity on the electric field distribution of a rat mesenteric vasculature model under electroporation conditions. Electroporation is a nonviral, physical technique that involves transient dielectric breakdown of the cell’s plasma membrane when high intensity and short duration ...

Numerical Simulation of the Electrochemical Impedance of a Microelectrode using FEMLAB

Gabrielli, C., Keddam, M., Rousseau, P., Vivier, V.
UPR 15 CNRS “LISE”, case 133 - Université P. & M. Curie, Paris, France

Numerical simulations of electrochemical impedance diagrams are reported using a 2D-axis symmetry FEM calculations. The impedance is the ratio of the potential over the current, but it is highly depending of the concentration of the various chemical species in the solution, particularly the ionic ones wich are sensible to migration, diffusion and convection effects. In this study, only the ...

Simulation of evaporating droplets on AFM-cantilevers

Haschke, T.1, Lautenschlager, D.1, Wiechert, W.1, Bonaccurso, E.2, Butt, H.J.2
1 University of Siegen, Faculty 11, Department of Simulation, Siegen, Germany
2 Max-Planck-Institute for Polymer Research, Polymer Physics Group, Mainz, Germany

The design of micro and nanoscale systems is a great challenge for modelling and simulation. In particular Lab-on-a-Chip-technology offers a wide spectrum of possible applications. Recently Bonaccurso and Butt (Bonaccurso & Butt 2005) presented a new approach to investigate droplet evaporation: They placed water droplets on rectangular, silicon atomic force microscope (AFM) cantilevers so that ...

3D electromagnetic modelling of a cold crucible for induction electro-processing of materials

Ernst, R.
EPM-MADYLAM laboratory, CNRS, Saint Martin d’Hères, France

The cold crucible is a tool which is frequently used for induction heating applications for the elaboration of materials by middle or high frequency magnetic field. This crucible is made of copper sectors assembled together to form the container in which the electroconductive material is molten. Each sector is water cooled, which keeps the crucible cold when the material is heated and molten ...

Ultrasound Propagation in Viscoelastic Material Guides

Castaings, M.1, Predoi, M.V.2, Hosten, B.1 1 Laboratoire Mécanique Physique, Univ. Bordeaux 1, UMR CNRS 5469, Talence, France
2 Catedra de Mecanica, Universitatea Politehnica Bucuresti, Bucuresti, Romania

Wave propagation in elastic waveguides is a problem of constant interest from the last decades. Several numerical approaches exist. The most intuitive uses time-marching routines that solve the equations of dynamic equilibrium and supply displacements of the structure nodes as time functions. This procedure is usually time and memory consuming due to huge number of temporal iterations required ...

Modeling an integrated, high flow rate MEMS ferrofluid pump

Mao, L., Koser, H.
Department of Electrical Engineering, Yale University, New Haven, CT

We present a FEMLAB modeling study of an integrated, high-flow rate microfluidic pump for ferrofluids. Initial studies of these microfluidic devices have been performed using a onedimensional setup in MATLAB and later confirmed by corresponding simulations with FEMLAB 3.1 in partial differential equation (PDE) mode. It is determined that maximum flow velocity is achieved when the product of ...

Simulation of conventional and induced-charge electroosmotic flows

Schonfeld, F.1, Hardt, S.2
1 Institut für Mikrotechnik Mainz GmbH
2 Darmstadt University of Technology

The fluidic motion driven by Coulomb forces on charge clouds in the vicinity of charged walls immersed into an electrolyte is termed electroosmotic flow (EOF). Since the generated EOF pressure increases with decreasing hydrodynamic diameter, such actuation mechanisms are ideally suited for microfluidic applications and are widely discussed in the literature (see e.g. Li 2004). In addition to ...

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