Presentazioni e Articoli Tecnici

In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

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 ...

Optimization of thin film heater/sensor design for miniature devices using finite element analysis

Hoang, V.N., Kaigala, G.V., Backhouse, C.J.
ECERF, University of Alberta, Edmonton, Alberta, Canada

Localized heating is poised to become an integral part of microfluidic devices in various life-science applications. This is catalyzed by the scale of economics, the advantageous fluidic behavior at small volumes, and the ever increasing need for rapid and high throughput assays for pharmaceutical industry and other combinatorialbased studies. For precision confined heating, thin film resistive ...

Numerical Calculations of Pulsed Laser Heating of Non-isotropic Materials

Gamborg Andersen, G., Petrunin, V.V., Baurichter, A.
University of Southern Denmark, Physics Department, Odense, Denmark

We used FEMLAB (Finite Element Modelling LABoratory) for modelling heat propagation in 4 dimensions (time and the 3 spatial dimensions) after pulsed laser heating of non-isotropic materials during surface science experiments. As an example, the spatial and temporal evolution of a laser induced temperature jump in highly oriented pyrolytically grown graphite (HOPG) was calculated on a ns time ...

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 ...

Numerical Simulation of Fluid Flow During Arc Welding

Carin, M.1, Favre, E.2
1 Laboratoire d’Etudes Thermiques Energétique et Environnement, Université de Bretagne Sud, Lorient, France
2 Comsol France, Grenoble, France

A 2D axisymmetric model of a melt pool created by an arc type heat source has been developed using FEMLAB. The model solves the coupled equations of laminar fluid flow and heat transfer to demonstrate the flow behaviour in the pool. The coupled effects of buoyancy and capillary forces are taken into account. The presence of the liquid – solid interface is modelled by two different ways: a ...

Nearwell Bore Pressure Transient Simulation with Geomechanical Deformation for Formation Evaluation in Weak Reservoirs

Lee, H.J., Torres-Verdín, C., Sepehrnoori, K.
The University of Texas at Austin

Geomechanics is valuable to account the rock deformations due to pore pressure and temperature changes resulting from production and fluid injection. We have used the FEMLAB 3.1 earth science module’s coupled geomechanical-fluid flow model to test its application to near wellbore pressure transient analysis. The new feature in FEMLAB 3.1 enables to couple geomechanical and fluid flow models ...

Modeling Thermal Stresses of Copper Interconnects in 3D IC Structures

Bentz, D.N., Zhang, J., Bloomfield, M., Lu, J-Q., Gutmann, R.J., Cale, T.S.
Rensselaer Polytechnic Institute

One of the key issues in developing higher density microelectronics devices is the impact of the stresses induced by thermal expansion mismatches of the materials used. We have examined, using FEMLAB, the stresses due to interwafer copper interconnects embedded in multilayer structures created by bonding two wafers using an organic low-k dielectric glue, benzocylcobutene (BCB). This work ...

The eggshell method for magnetic force computation

Nool, M., Lahaye, D.
Centrum voor Wiskunde en Informatica (CWI), Amsterdam, The Netherlands

The eggshell method was introduced by F. Henrotte as a novel magnetic force computation method. It allows computation of the force by integrating the magnetic stress tensor over a shell surrounding the body of interest. We investigate the numerical properties of this method for current carrying wires, and permanent magnets immersed in two-dimensional stationary magnetic fields, discretized by ...

Confinement Loss Computations in Photonic Crystal Fibres using a Novel Perfectly Matched Layer Design

Viale, P., Février, S., Gérôme, F., Vilard, H.
IRCOM, CNRS UMR 6615, Limoges, France

To modelize infinite photonic crystal fibre (PCF) with 2D-finite-geometry mode solver, it is necessary to use a perfectly matched layer (PML). We have performed a new type of PML design to simulate propagation in PCFs. The results obtained with index-guiding PCFs are in very good agreement with previous theoretical published results. Our PML is quickly optimized. The link between MATLAB and ...

Model predictive control of a complex rheological forming process based on a finite element model

Bernard, T., Herrero Blanco, I., Peters, M.
Fraunhofer Institute for Information and Data Processing IITB, Business Unit Systems for Measurement, Control, and Diagnosis (MRD), Karlsruhe

Rheological forming processes of glass and plastics, where heat conduction, radiation and fluid dynamics are the main physical effects, are strongly nonlinear. The aim of this paper is to investigate a control design with the use of the spatially distributed model. As control methodology we investigate linear and nonlinear model predictive control (MPC, NMPC) schemes. These approaches are ...

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