Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abramgem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

Multiphysics Simulation of Thermoelectric Systems - Modeling of Peltier-Cooling and Thermoelectric Generation

M. Jaegle
Fraunhofer-Institute for Physical Measurement-Techniques (IPM), Freiburg, Germany

Electro-thermal interaction is commonly considered only as a matter of joule heating. In addition, the Seebeck-, Peltier- and Thompson-Effects are significant in materials with high thermoelectric figure of merit Z. These thermoelectric materials have a high Seebeck-coefficient α, a good electric conductivity σ, and a poor thermal conductivity λ. They have widespread areas of ...

Numerical Simulation of Si Nanosecond Laser Annealing by COMSOL Multiphysics

M. Darif, and N. Semmar
GREMI-UMR6606, CNRS-Universite d’Orleans, Orléans, France

A 2D transient heat conduction model was created in COMSOL Multiphysics to simulate temperature changes in material irradiated by a KrF laser beam confined on silicon’s surface. In this paper, the obtained results are shown and discussed in case of bulk Silicon. The heat source is distributed in time with ‘gate’ and ‘gaussian’ shapes. The thermal properties values ...

A Dynamic Electrowetting Simulation using the Level-Set Method

B. Cahill[1], A. Giannitsis[1], G. Gastrock[1], M. Min[1,2], and D. Beckmann[1]
[1]Institut für Bioprozess- und Analysenmesstechnik e.V., Heiligenstadt, Germany
[2] Department of Electronics, Tallinn University of Technology, Tallinn, Estonia

Electrowetting occurs with the electrical control of the surface wetting properties through the application of an electric potential. A simulation of electrowetting driven droplet dynamics is performed using the COMSOL Multiphysics level-set method for a sessile droplet and for a droplet in a microchannel. The response of the drop to a step voltage is studied. The contact angle at one edge of ...

Heat and Mass Transfer in Convective Drying Processes

C. Gavrila[1], A. Ghiaus[1], and I. Gruia[2]
[1]Technical University of Civil Engineering Bucharest, Faculty of Building Services, Bucharest, Romania
[2]University of Bucharest, Faculty of Physics, Bucharest, Romania

A dynamic mathematical model, based on physical and transport properties and mass and energy balances, was developed for the simulation of unsteady convective drying of agricultural products (fruits and vegetables) in static bed conditions. The model utilizes water sorption isotherm equations and the change in solid density due to the shrinkage phenomenon. The aim of this article is to describe ...

Analyzing Muffler Performance Using the Transfer Matrix Method 

K. Andersen
Dinex Emission Technology A/S, Middelfart, Denmark

Exhaust noise must meet legislation targets, customer expectations and cost reduction which call for design optimization of the exhaust systems in the design phase. One solution is to use 3 dimensional linear pressure acoustics and calculate the transfer matrix of the muffler. The transfer matrix is the basis for calculating either the insertion loss or transmission loss of a muffler. The 3D ...

Accuracy Tests for COMSOL - and Delaunay Meshes

E. Holzbecher, and Hang Si
Weierstrass Institute for Applied Analysis and Stochastics (WIAS), Berlin, Germany

In the paper we examine the accuracy of various meshes for different model regions and simple differential equations in 2D and in 3D. We study the potential equation for a single irregular domain (2D testcase 1), for a simple domain with irregular sub-domains (2D testcase 2) and a 3D testcase. For testcase 1 we compare with the analytical solution, for testcases 2 with the best solution, ...

The use of COMSOL for Building Constructions Engineering Regarding Heat and Moisture Transport

H. Schellen, A. van Schijndel, and P. Briggen
Eindhoven University of Technology, Eindhoven, Netherlands

Hunting Lodge St. Hubertus is one of the most prominent Dutch buildings from the early twentieth century. An extensive study of wind and wind-driven rain (WDR) was conducted to provide insight into the moisture load of the building facade, using measurements and CFD simulations. COMSOL Multiphysics was also used for modeling the moisture transport through the walls of the tower. The model ...

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 ...

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 ...

Validation of DNS Techniques for Dynamic Combined Indoor Air and Constructions Simulations Using an Experimental Scale Model

T. van Goch, and A. van Schijndel
Eindhoven University of Technology, Eindhoven, Netherlands

This paper presents a study on the application of Direct Numerical Solving (DNS) techniques using an experimental scale model. COMSOL Multiphysics is promising in solving dynamic heat and air transport. The experiments can be extremely useful as benchmark for CFD codes.

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