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.

Comparing Equations for Two-Phase Fluid Flow in Porous Media

T. Bjornara, and E. Aker
NGI, Oslo, Norway

Various types of equation system formulations for modeling two-phase flow in porous media using the finite element method have been investigated. These allow for equation manipulation such that the main differences between the formulations are the dependent variables that are solved for. Here we have tested five different formulations for 2D simulations and one for 1D; the Buckley-Leverett ...

Simulation of Optical Properties of the Si/SiO2/Al Interface  at the Rear of Industrially Fabricated Si Solar Cells

Y. Yang[1], and P. Altermatt[1,2]
[1]Institute for Solar Energy Research Hamelin (ISFH), Emmerthal, Germany
[2]Dep. Solar Energy Research, Inst. Solid-State Physics, Leibniz University of Hanover, Germany

The specular and diffuse reflection properties of sunlight at the rear surface of silicon solar cells with various degrees of roughness are computed by solving the Maxwell and material equations in two dimensions, using the COMSOL RF Module. The model is tested on planar Si/SiO2/air interfaces and planar Si/SiO2/Al interfaces. The simulations show that for wavelengths of 800 nm, (i) maximum ...

Thermal and Material Flow Modelling of Friction Stir Welding Using COMSOL

H. Schmidt[1,2], and J. Hattel[1]
[1]Technical University of Denmark, Kgs. Lyngby, Denmark
[2]HBS Engineering, Frederiksberg, Denmark

Two friction stir welding models are presented – a global thermal model using the temperature dependent heat source and a local material flow and heat generation model allowing for detailed investigation of different contact conditions. The two models are coupled into a larger local-global model. The flow model includes frictional dissipation from the contact between the work piece and the ...

Modeling the Thermally Induced Curvature of Multilayer Coatings with COMSOL MultiphysicsTM

H. Conrad[1], T. Klose[2], T. Sandner[2], D. Jung[1], H. Schenk[2], and H. Lakner[1,2]
[1]Semiconductor and Microsystems Technology Laboratory, Technische Universität Dresden, Germany
[2]Fraunhofer Institute for Photonic Microsystems Dresden, Germany

Within this paper the so called “birth and death” method is demonstrated in use with COMSOL Multiphysics®. With this method the free and reactionless movement of a solid structure on deformed geometries and the activation of this solid structure at later simulation steps is possible. For demonstrating the benefit, this method was applied to simulate the thermal induced ...

Modeling Polybenzimidazole/Phosphoric Acid Membrane Behaviour in a HTPEM Fuel Cell

C. Siegel[1,2], G. Bandlamudi[1,2], and A. Heinzel[1,2]
[1]Zentrum für BrennstoffzellenTechnik (ZBT) gGmbH, Duisburg, Germany
[2]Institut für Energie- und Umweltverfahrenstechnik, University of Duisburg-Essen, Duisburg, Germany

Phosphoric acid doped polybenzimidazole (PBI) membranes are commonly used in today’s high-temperature polymer-electrolyte-membrane (HTPEM) fuel cell technology. COMSOL Multiphysics is used to model and simulate the three-dimensional, single-phase, non-isothermal overall cell behaviour at different operating points. The sol-gel PBI/H3PO4 membrane behaviour is modeled using an Arrhenius ...

Prediction and Optimization of Surface-Enhanced Raman Scattering Geometries using COMSOL Multiphysics

I. Knorr, K. Christou, J. Meinertz, A. Selle, J. Ihlemann, and G. Marowsky
Laser-Laboratorium Göttingen e.V., Germany

Raman spectroscopy is a commonly used tool in biodiagnostics and sensor technology. Surface-enhanced Raman scattering provides high signal enhancements especially at nanostructured metallic surfaces. In this paper the electromagnetic Raman enhancement from different metallic nanostructures - including gold coated gratings, spherical and hemispherical particles - is calculated by using the finite ...

Nanofiltration Modeling Based on the Extended Nernst-Planck Equation under Different Physical Modes

J. Gozálvez-Zafrilla, and A. Santafé-Moros
Department of Chemical and Nuclear Engineering, Universidad Politécnica de Valencia, Valencia, Spain

The most successful nanofiltration models are those based on the combination of the Extended Nernst-Planck equation with the Donnan steric equilibrium. These models have been typically solved by using iterative procedures based on the Runge-Kutta method. Yet, such procedures present convergence problems in some cases. In this paper, we present an implementation of the original Donnan Steric ...

Numerical Modelling of Vortex Induced Vibrations  in Submarine Pipelines

F. Van den Abeele, J. Vande Voorde, and P. Goes
ArcelorMittal Research & Development Industry Gent, Zelzate, Belgium

Vortex-induced vibration is a major cause of fatigue failure in submarine oil and gas pipelines and steel catenary risers. Even moderate currents can induce vortex shedding. In this paper, COMSOL Multiphysics is applied to study the flow pattern around submarine pipeline spans, and predict the amplitude and frequency of the vortex induced vibrations. The sensitivity of the computational fluid ...

Implementation of the Finite Isotropic Linear Cosserat Models based on the Weak Form

J. Jeong[1], and H. Ramezani[2]
[1]Ecole Speciale des Travaux Publics du Batiment et del’Industrie(ESTP), Cachan, France
[2]Ecole Polytechnique de l’Universite d’Orleans CNRS/CRMD, Orleans, France

The Cosserat models fall into the group of the extended continuum media. They are capable of treating the size effects (characteristic length) in a natural manner using six material moduli for the isotropic elastic cases instead of two (and) for the classical continuum mechanics. This model involves two constitutive laws corresponding to two kinds of balance equation. The first one handles the ...

Simulation of Unidirectional Interdigital Transducers in SAW Devices using COMSOL Multiphysics

D. Pradeep, N. Krishnan, and H. Nemade
Department of Electronics and Communication Engineering, Indian Institute of Technology Guwahati, India

Surface acoustic wave (SAW) devices based on Rayleigh wave, shear wave, love wave, acoustic plate mode (APM) wave and flexural plate wave have been explored for sensors, actuators and telecommunication applications. An interdigital transducer (IDT) is a metallic comb-like structure fabricated over piezoelectric substrate. SAWs are generated over the substrate by applying electrical signal to the ...