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.

Implementation of Structural Topology Optimization in COMSOL

B. Lemke, Z. Liu, and J.G. Korvink
IMTEK, Lehrstuhl Simulation, Freiburg im Breisgau

Structural topology optimization is an important research topic to improve the performance of the mechanical design. We show how to use COMSOL as an integration environment to implement structural topology optimization using the density method and the level set method.

Numerical Simulation of Electromagnetic-wave Propagation for Land Mine Detection using Ground Penetrating Radar

M.A. González-Huici[1], U. Uschkerat[1], and A. Hördt[2]
[1] FGAN e.V., FHR, Wachtberg;
[2] TU Braunschweig, Institut für Geophysik und extraterrestrische Physik, Braunschweig

This paper examines numerically the imaging of buried land mines, modelled as small abnormalities imbedded in an otherwise uniform media, using ultrawide-band (UWB) time domain radar. Herein, we carry out our system modelling, and simulate high frequency electromagnetic wave propagation in different media and near field scattering from interfaces and objects. The simulations are computed ...

PDE-constrained Control using FEMLAB - Control of the Navier-Stokes Equations

T. Slawig
TU Berlin, Inst. f. Math., Berlin

We show how the numerical solution of control problems constrained by Partial Differential Equations (PDEs) can be computed using COMSOL Multiphysics and its scripting language. We present the method to derive the optimality system, i.e. the necessary conditions for a minimum, and show how to implement and solve it using COMSOL Multiphysics‘ built-in nonlinear damped Newton method. As an ...

Two-Dimensional, Non-Isothermal, Two-Phase Flow inside the Gas Diffusion Layer Unit of the Polymer-Electrolyte-Membrane Fuel Cell

C. Siegel
Universität Luxemburg, Facultät STC/Elektrotechnik, Luxemburg

A two-dimensional, non-isothermal, two-phase flow model of a porous cathode gas diffusion layer of a polymerelectrolyte- membrane fuel cell is presented and solved numerically using computational fluid dynamics coding and sequentially solver scripting. The model accounts for multicomponent species diffusion, phase change and water transport. The heat transfer is investigated for the fluids ...

Moving Meshes for Electromagnets

H. Biller
Continental Teves AG & Co. oHG, Elektronische Brems- und Sicherheitssysteme, Frankfurt

The main design goals for electromagnetic actuators are force, dynamic behaviour, and energy efficiency. In the development of valves for electronic brake systems at Continental Automotive Systems, COMSOL multiphysics is used in order to assess all three aspects. For instance, the response to a voltage step involves the calculation of time-dependent magnetic fields, of eddy currents, and of ...

Calculation of Quality Factors and Amplitudes of Photoacoustic Resonators

B. Baumann[1], M. Wolff[1,2], B. Kost[1], and H. Groninga[2]
[1] Hamburg University of Applied Sciences, Faculty of Engineering and Computer Science
[2] PAS-Tech GmbH

A procedure for the numerical calculation of photoacoustic signals is introduced. It is based on the finite element method and uses an expansion of the signal into acoustical eigenmodes of the measuring cell. The method is verified for cylindrical cells with excellent accordance. Application to photoacoustic cells of unconventional shape yields good agreement with experimental data.

Berechnung der Bewegung eines magnetisch angetriebenen Ankers

P.R. Zeller, and K. Schiefermayr
Fachhochschule Wels, Automatisierungstechnik, Wels

Zur effizienten Entwicklung magnetisch angetriebener Schaltgeräte ist es aufgrund der zunehmenden Komplexität und des hohen Optimierungsdruckes notwendig leistungsstarke Berechnungsmethoden für Konstrukteure zu entwickeln. Nachdem analytische Modelle nur sehr einfache Geometrien erfassen können bieten sich Finite-Elemente- Programme zur Simulation derartiger Antriebe an. Ziel dieser ...

FE-Modelling of Induction Tool Responses

J.B. Stoll
ANTARES Datensysteme GmbH, Geophysik, Stuhr

This paper describes the most common methods used to construct numerical models for induction borehole tool responses. Numerical methods are efficient for studying 2D and 3D problems. To illustrate the use of the finite element method in resistivity modelling, an axisymmetric finte element modelling of a 2-coil and 4 coil induction tool response is discussed.

Elektromagnetische Wellen in der EMV Messtechnik

M. Koch, and S. Battermann
Leibniz Universität Hannover, Institut für Grundlagen der Elektrotechnik und Messtechnik

In diesem Beitrag werden die wichtigsten Feldtesteinrichtungen aus dem Bereich der elektromagnetischen Verträglichkeit vorgestellt. Ausgehend von den Anforderungen, die verschiedene Normen an die Feldqualität stellen, werden auftretende Probleme aufgezeigt. Mit numerischen Verfahren wird die Eignung für EMV-Messungen untersucht und anhand der Simulationsergebnisse werden die ...

Calculating the Fatigue Crack Initiation in Machine Parts under Random Multiaxial Loading

A. Nieslony[1], and C.M. Sonsino[2]
[1] Opole University of Technology, Department of Mechanics and Machine Design, Opole, Poland
[2] Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF, Darmstadt

The authors present a method for estimating fatigue life due to crack initiation using FEM under multiaxial random loading. The proposed method uses the multiaxial fatigue failure criteria based on the critical plane concept. Damages were determined with the spectral method from power spectral density (PSD) function of the equivalent stress history. The authors used linear-elastic ...

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