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.

Thermo-Hydro-Mechanical-Chemical Modelling of the Bentonite Barriers in Final Disposal of High Level Nuclear Waste

M. Olin, M. Tanhua-Tyrkkö, V. Pulkkanen, A. Itälä, K. Rasilainen, A. Seppälä, and M. Liukkonen
VTT Technical Research Centre of Finland, Nuclear Energy, Finland

The bentonite barrier is an essential part of safe nuclear waste repository in granite bedrock. In this work COMSOL Multiphysics® is applied to modeling Thermo-Hydro-Mechanical-Chemical (THMC) processes taking place in a bentonite buffer. The system is studied in different geometries, which consists of an overall 3D layout and a 2D cross-section of bentonite buffer and open fracture. ...

Simulation of Surface Chemical Reactions in a Monolith Channel for Hydrogen Production

N. Pacheco[1], D. Pavone[1], K. Surla[1], J. Houzelot[2], and E. Schaer[2]
[1]IFP-Lyon, Solaize, France
[2]ENSIC, Solaize, France

This paper intends to show a model of a monolithic reactor for the autothermal reforming process (ATR), a process that uses hydrocarbons to produce H2. The ATR chemical reactions take place on the surface of monolith channels coated with a catalyst. The isothermal ATR reactor is modeled using 42 catalytic surface chemical reactions that involve 13 solid species and 7 gas species. To solve the ...

Benchmarking as Key Element of Confidence Building in Safety Assessments for Radioactive Waste Disposal

E. Weetjens
SCK-CEN (the Belgian Nuclear Research Centre), Mol, Belgium

Verification of the codes applied for assessment of the long-term repository safety is typically one of the quality assurance requirements demanded by regulatory bodies, in the disposal of radioactive waste. In this paper, an internationally organized benchmark exercise is presented, in which the comparison was carried out for a selection of key radionuclides. The examples presented in this paper ...

Flow and Mixing in the Liquid between Bubbles

B. Finlayson[1]
[1]Department of Chemical Engineering, University of Washington, Seattle, Washington, USA

Mixing is characterized in liquids moving between bubbles when the bubbles are moving down a microfluidic channel. The shape is assumed based on fluid mechanical arguments and experimental observations, and the mixing is characterized for a variety of situations in two and three-dimensions. In COMSOL Multiphysics, an integration coupling variable was used by solving the problem in two dimensions ...

Magneto-hydrodynamic Flow in Electrolyte Solutions

M. Qin[1], and H. Bau[1]
[1]Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Pennsylvania, USA

The paper presents and compares two models for simulating magneto-hydrodynamic flow of RedOx electrolyte in a conduit patterned with circular pillars. The first model solves the coupled Nernst-Planck and Navier-Stokes equations subjected to Butler-Volmer electrode kinetics and provides detailed information on ions’ concentrations. The second model treats the electrolyte as a conductor, and ...

COMSOL Multiphysics – Fuel Cell and LED applications

C-H. Cheng
National Central University, Chungli, Taiwan

Dr. Chin-Hsien Cheng received his PhD. Degree in National Tsing-Hua University, Taiwan in 2007. He joined Institute for Integrated Energy Systems, University of Victoria, Canada as a post-doctoral fellow until Aug. 2009. Currently, he is a research associate and lab manager of the Modeling and Simulation Lab. in the Fuel Cell Center, Yuan-Ze University. Dr. Cheng has been work in the field of ...

Control of Technological and Production Processes Modeled by COMSOL Multiphysics as Distributed Parameter Systems

G. Hulkó, C. Belavý, G. Takács, and P. Zajíček
Slovak Technical University in Bratislava, Bratislava, Slovakia

COMSOL Multiphysics is widely utilized in the modeling of dynamics of technological and manufacturing processes. At the same time the investigated technological and manufacturing processes are generally described by systems of partial differential equations as distributed parameter systems. This paper presents actual possibilities of control of systems modeled by COMSOL Multiphysics as ...

Blistering of Industrial Floors on Concrete Substrate: The Role of Air Overpressure

P. Devillers[1], S.V. Aher[2], G. Fau[3], B. Tranain[3], and C. Buisson[1]
[1]Centre des Matériaux de Grande Diffusion, Ecole des Mines d’Alès, France
[2]Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India
[3]Centre Scientifique et Technique du Bâtiment, Champs sur Marne, France

A three dimensional COMSOL Multiphysics, transient analysis, diffusion model has been adopted to model the transfers of water in the industrial concrete floors. To take into account the different initial saturation levels at the different levels of the slab, the model is divided into three subdomains. The rise of the waterfront is also simulated and the air overpressure thereby developed at the ...

Simulation of Interaction of Low-Temperature Plasma with Immersed Solids

V. Hrubý, and R. Hrach
Department of Surface and Plasma Science, Charles University, Prague, Czech Republic

The computer simulation with COMSOL Multiphysics has become a widely used technique for the study of various problems in the field of plasma physics. Despite the increasing performance of computers, fully three-dimensional particle simulations still have got extremely high demands on hardware and computer time. Although many problems could be solved by fluid models, results obtained by these ...

A Flexible Scheme For Numerical Homogenisation In Linear Elasticity

A. Gerisch[1], S. Tiburtius[1], Q. Grimal[2], and K. Raum[3]
[1]Technische Universität Darmstadt, Germany
[2]Université Pierre et Marie Curie Paris VI, France
[3]Charité-Universitätsmedizin Berlin, Germany

Musculoskeletal mineralised tissues (MMTs), like bone or tendon, are a prime example of naturally occuring, hierarchically structured material. They display a great variety in mechanical function but are all based on essentially the same building block: the mineralised collagen fibril (100 nanometer in diameter). This building block is arranged in various spatial structures across many length ...

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