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Hier finden Sie Veröffentlichungen und Präsentationen der weltweit stattfindenden COMSOL-Konferenzen. In diesen präsentieren Ihre Fachkollegen ihre neuesten mit COMSOL Multiphysics entwickelten Produkte und Ideen. Die Forschungsthemen umfassen ein weites Feld von Industrien und Anwendungsbereichen, die von Mechanik und Elektronik über Strömungen bis zur Chemie reichen. Nutzen Sie die Quick Search, um die zu Ihrem Forschungsbereich passenden Präsentationen zu finden.

Numerical Modeling of Dielectrophoretic Forces Acting upon Biological Cells in Silicon Lab-On-Chip Devices

S. Burgarella, M. Bianchessi, and M. De Fazio
Advanced System Technology, R&I e-Health, STMicroelectronics, Agrate Brianza, Italy

Dielectrophoresis (DEP) is a promising method for the automated separation of biological cells in a miniaturized format. This technology allows cells to be manipulated electronically while suspended in a microfluidic channel embedded in a silicon lab-on-chip. In this work, several dielectrophoretic configurations have been designed and fabricated using micro-electro-mechanical-systems (MEMS) ...

Design of Light Emitting Diodes (LED)

E. Baur, M. Sabathil, and N. Linder
Osram Opto Semiconductors GmbH, Regensburg, Germany

For a proper design shaping of light emitting diodes, the exact knowledge of the current distribution in the active area is essential. On the one hand, one has to achieve a uniform current density over the chip area, on the other hand, one has to avoid current crowding in the neighborhood of the electrical contacts. In this paper it is shown first how a LED can be modeled by COMSOL Multiphysics. ...

Numerical Simulation of the Electrical Double Layer Based on the Poisson-Boltzmann Models for AC Electroosmosis Flows

P. Pham1, M. Howorth1, A. Planat-Chrétien1, and S. Tardu2
1Département des microTechnologies pour la Biologie et la Santé, CEA/LETI, Grenoble, France
2LEGI, Grenoble, France

In this paper, the analytical validation of Poisson-Boltzmann (PB) equation computed with COMSOL Multiphysics in the case of a polarized surface in contact with an electrolyte, is first presented.COMSOL Multiphysics algorithms easily handle the highly nonlinear aspect of the PB equation. The limitations of the PB model, that considers ions as point like charges, are outlined. To account for the ...

Transient Heat Conduction in Semi-Infinite Solids Irradiated by a Moving Heat Source

N. Bianco1, O. Manca2, S. Nardini2, and S. Tamburrino2
1Dipartimento di Energetica, Termofluidodinamica applicata e Condizionamenti ambientali, Università degli Studi Federico II, Napoli, Italia
2Dipartimento di Ingegneria Aerospaziale e Meccanica, Seconda Università degli Studi di Napoli, Napoli, Italia

An analysis of the transient temperature distribution in a semi-infinite solid, irradiated by a moving Gaussian laser beam, is carried out numerically using COMSOL Multiphysics.Variable thermo-physical properties are accounted for. The workpiece is considered semi-infinite along the motion direction. Temperature distributions are evaluated both for different Peclet numbers and surface heat ...

On the Convergence Order of COMSOL Solutions

A. Bradji1, and E. Holzbecher2
1Charles University, Prague, Czech Republic
2Weierstrass Institute for Applied Analysis and Stochastics WIAS, Berlin, Germany

The convergence of numerical solutions is mainly determined by the convergence order, which quantifies the improvement of the solution when the mesh is refined. In this paper we examine various differential equations and the convergence behavior of their COMSOL Finite Element solutions. The numerically observed convergence rates are compared with theoretical results, as far as these are ...

Parameter Extraction and Support-Loss in MEMS Resonators

Peter Steeneken
Project Leader
RF MEMS Research Group
NXP Semiconductors
Eindhoven, The Netherlands

In this paper it is shown how the equivalent circuit parameters of a MEMS resonator can be simply obtained from an eigenfrequency simulation. Additionally, it is demonstrated that the Q-factor as a result of support losses in a MEMS resonator can be determined using a matched boundary layer. The method is applied to calculate the frequency dependent admittance of a diamond disk resonator. Results ...

COMSOL 2D Simulation of Heavy Oil Recovery by Steam Assisted Gravity Drainage

I. I. Bogdanov, K. El Ganaoui, and A. M. Kamp
Centre Huile Lourde Ouvert et Expérimental (CHLOE), Pau, France

Multiphysics flexibility and computational performance of COMSOL gave us the idea to model SAGD (steam assisted gravity drainage), one of the popular thermal methods of oil recovery. The modeling is far from straightforward and requires solving a system of non-linear PDEs for thermal multiphase flow under conditions of thermodynamic (phase) equilibrium. This paper presents the main results of our ...

Finite Element Solution for Ionized Fields in a DC Electrostatic Precipitator

B. Benamar1, E. Favre2, A. Donnot1, and M. O. Rigo1
1 Laboratoire LERMAB, Faculté des Sciences et Techniques de Nancy, UMR, Vandoeuvre-lès-Nancy, France
2 COMSOL France, Grenoble, France

This paper presents the finite element solution for ionized fields in the coaxial cylinders configuration during the positive corona discharge using COMSOL Multiphysics. The coupled differential equations describing a monopolar DC corona are completely solved by using three application modes:PDE (General Form) mode for electric potential distribution, PDE (General Form) mode for space charge ...

A Material Model for Simulating Volume Changes during Phase Transformations

M. Tehler, and S. Jonsson
Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden

The present work describes the first steps in creating a robust material model able to predict volume changes due to thermal expansion and phase transformations.A dilatometer test is simulated starting from room temperature, with an original microstructure constituting a mixture of ferrite and pearlite. During heating, the structure transforms to austenite, which upon quenching will transform ...

Modeling of Drops Spreading on Random Surfaces

J. Frassy1, C. Lecot2, M. Murariu3, C. Delattre1, and A. Soucemarianadin1
1Université Joseph Fourier, Grenoble, France
2Université de Savoie, Le Bourget-du-Lac, France
3LETI, CEA, Grenoble, France

We present simulations of drops spreading on random surfaces with either chemical or topographical heterogeneities. All the computations are made within the framework of the lubrication approximation. The droplet height is the solution of a time-dependent nonlinear fourth order partial differential equation, which is solved using COMSOL. Fast Fourier Transform (FFT) together with an appropriate ...

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