Artigos Técnicos e Apresentações

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.

Exploitation of Laminar Flow for Cell-Based Assays

M. F. Santillo1, and A. G. Ewing1,2
1Department of Chemistry, Pennsylvania State University, University Park, PA, USA
2Department of Chemistry, Göteborg University, Göteborg, Sweden

A microfluidic device for performing multiplexed cell bioassays has been successfully developed. The device takes advantage of laminar flow and hydrodynamic focusing in order to selectively load cells into various culture chambers and address cells with pharmacological agents. Both computational fluid dynamics (CFD) simulations and fluorescence microscopy illustrate how fluid flow can be ...

Channels and Melting in Deformable Porous Media

S. L. Butler

Department of Geological Sciences, University of Saskatchewan, SK, Canada

Partial melting occurs beneath mid-ocean ridges in Earth's mantle and the resulting liquid migrates to the surface to form a new oceanic crust. In this system, mass can be exchanged between the liquid and solid phases through melting and solidification and, at the high temperatures and pressures associated with the Earth's interior, the solid matrix deforms through the process of compaction, ...

Computation of Airfoils at Very Low Reynolds Numbers

D. Bichsel1, and P. Wittwer2
1HESSO, Ecole d'Ingénieurs de Genève, Geneva, Switzerland
2DPT, Université de Genève, Geneva, Switzerland

We discuss a new numerical scheme involving adaptive boundary conditions which allows to compute, at very low Reynolds numbers, drag and lift of airfoils with rough surfaces; efficiently and with great precision.As an example, we present the numerical implementation for an airfoil consisting of a line segment. The solution of the Navier-Stokes equations is singular at the leading and trailing ...

Optimal PDE Control Using COMSOL Multiphysics

I. Neitzel[1], U. Prüfert[2], and T. Slawig[3]

[1]Technische Universität Berlin / SPP 1253
[2]Technische Universität Berlin / Matheon
[3]Excellence Cluster The Future Ocean, Algorithmic Optimal Control - Oceanic CO2-Uptake/SPP 1253

An optimal control problem (OCP) is studied to a PDE of elliptic type as well as state constraints. The resulting optimality system contains two PDEs, one algebraic equation and the so called complementary slackness conditions, i.e. dual products between function spaces. At this point, different regularization techniques come into use. In this paper we introduce a Barrier method as one possible ...

COMSOL Modeling of a Submarine Geothermal Chimney

M. Suárez [1], and F. Samaniego [2]
[1]Faculty of Sciences, Michoacán University (UMSNH), Morelia, Michoacan, Mexico
[2]Faculty of Engineering Postgrade Studies Division, National University of Mexico (UNAM), Mexico City, Mexico

New geothermal energy sources hold promise for the future. Deep submarine geothermal energy related to hydrothermal vents is emerging in many places along the oceanic spreading centers. Shallow submarine geothermal systems are found near to continental platforms. We present the initial development of mathematical models to simulate the energy transport in submarine systems. A model for the ...

Clean Energy Technologies: Growing Need for Multiphysics Modeling

Iouri Balachov
Senior Scientist,
SRI International, Menlo Park, CA, USA

Iouri Balachov is a Senior Scientist at SRI International (Menlo Park, CA) where he is leading development of Direct Carbon Fuel Cell technology for clean and efficient power generation from coal, biomass, and a wide variety of carbon containing fuels. Prior to SRI he was an engineer at Westinghouse nuclear (Pittsburgh, PA), researcher at Penn State University (State College, PA), and researcher ...

Modelling the Thermal Impact of a Repository for High-Level Radioactive Waste in a Clay Host Formation

X. Sillen
Belgian Nuclear Research Centre (SCK-CEN), Waste & Disposal Department, Mol, Belgium

Disposal in deep clay geological formations is one of the promising options for disposal of high-level radioactive waste. Yet, they can generate considerable amounts of heat as a side effect of radioactive decay. This paper shows how COMSOL Multiphysics has been used to evaluate the physical impacts of the heating on the geological media around a deep disposal system. The software was found ...

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 ...

Multiphysics Modeling of Engineered Structured Sorbents for the Adsorption of Carbon Dioxide and Water Vapor from Manned Spacecraft Atmospheres

J. Knox
NASA, Huntsville, AL, USA

In NASA’s Vision for Space Exploration, humans will once again travel beyond the confines of earth’s gravity, this time to remain there for extended periods. Thus all spacecraft systems, including those for the separation of metabolic carbon dioxide and water from a crewed vehicle, must be minimized with respect to mass, power, and volume. This paper describes efforts to improve on ...

Chemical Leachate Simulation for Environmental Safety Evaluation in Civil Engineering Applications of Construction Byproducts

H. Ishimori
National Institute for Environmental Studies, Tsukuba, Japan

This presentation shows a numerical simulation model of the chemical leachate process from construction byproducts and the chemical transport process with geochemical reactions for their environmental safety evaluation.

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