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.

Reliable Full-Wave EM Simulation of a Single-Layer SIW Interconnect with Transitions to Microstrip Lines

J. L. Chavez-Hurtado[1], J. E. Rayas-Sanchez[1], Z. Brito-Brito[1]
[1]ITESO - Universidad Jesuita de Guadalajara, Tlaquepaque, Jalisco, Mexico

We present a procedure to obtain reliable EM responses for a SIW interconnect with microstrip line transitions. The procedure focuses on two COMSOL® configuration settings: meshing size and simulation bounding box. Once both are properly configured, the implemented structure is tested by perturbing the simulation bounding box to ensure it has no effect on the EM responses.

Radiation Force Effect at the Dielectric Water-Air Interface

G. V. B. Lukasievicz[1], N. G. C. Astrath[2], L. C. Malacarne[2], M. L. Baesso[2], S. E. Bialkowski[3]
[1]Universidade Tecnológica Federal do Paraná, Toledo, PR, Brazil
[2]Universidade Estadual de Maringá, Maringá, PR, Brazil
[3]Utah State University, Logan, Utah, USA

The radiation force effects on the surface displacement can be calculated by solving the Navier-Stokes equation with appropriated boundary conditions. The surface deformation can be described by the radiation pressure as well as those forces due to gravity and surface tension. We used the photomechanical mirror (PM) method to measure the time-evolution of the nanometer deformation generated on ...

FEMLAB Simulation von Hohlkathodenentladungen zur Erzeugung von extrem ultravioletter (EUV) Strahlung

Wieneke, S., Kromer, J., Ach, F., Viöl, W.
Hochschule für angewandte Wissenschaft und Kunst, Fakultät Naturwissenschaften und Technik, Göttingen

Für intensive Strahlungsquellen im Spektralbereich von Vakuumultraviolett (VUV, 10 -200 nm) über extremes Ultraviolett (XUV, 1 – 10 nm) bis in den Bereich der weichen Röntgenstrahlung (SXR, 0,1 – 1 nm) (siehe Abbildung 1) besteht in Forschung und Industrie ein hoher Bedarf, der in der Zukunft noch deutlich wachsen wird. Insbesondere im Bereich der Röntgenlithographie zur Herstellung von ...

Simulation of Flaw Signals in a Magnetic Flux Leakage Inspection Procedure

O. Nemitz, and T. Schmitte
Salzgitter Mannesmann Forschung GmbH, Duisburg, Germany

In the inspection of steel products with respect to flaws a magnetic flux leakage (MFL) test procedure can be applied. In this procedure a “horseshoe” shaped yoke is used, whose legs are wrapped with coils through which an alternate current with a high frequency (3 kHz) is flowing. Hereby a thin magnetic field is induced near the surface of the test object which leaks from the material if a ...

Electromagnetic Force Simulations on a Reaction Sphere for Satellite Attitude Control

L. Rossini[1], E. Onillon[1], O.Chetelat[1], and C. Allegranza[2]
[1]Centre Suisse d’Electronique et Microtechnique, Switzerland
[2]ESA/ESTEC, The Netherlands

In the frame of an ESA project, CSEM in collaboration with other partners has developed an innovative Attitude Orbit Control System concept that relies on a Reaction Sphere. We propose to use one unique magnetic bearing Reaction Sphere whose spin axis and angular velocity can be positioned by dedicated control. The design is based on a 3-D permanent magnet motor obtained with a multi pole rotor ...

Numerical Simulation of pH-sensitive Hydrogel Response in Different Conditions

M.K. Ghantasala[1], B.O. Asimba[1], A. Khaminwa[1], K.J. Suthar[2], D.C. Mancini[3]
[1]Department of Mechanical and Aeronautical Engineering, Western Michigan University, Kalamazoo, MI, USA
[2]Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
[3]Physical Sciences and Engineering, Argonne National Laboratory, Argonne, IL, USA

The understanding of pH-sensitive hydrogel swelling response in different buffer environmental condition is essential for its use in different practical applications. This necessitates its simulation in steady state and transient conditions. This paper mainly deals with the details of the numerical simulation performed by developing coupled formulation of chemo-electro-mechanical behavior of the ...

Towards Optimized Neural Stimulation in a Device for Urinary Incontinence

A.N. Shiraz[1], A. Demosthenous[1]
[1]E&EE Department, University College London, London, United Kingdom

After spinal cord injury (SCI) the functions of the lower urinary tract are often disrupted and may have fatal consequences for the patient. It has been shown that using a transrectal probe developed by Craggs et al., through conditional transrectal stimulation of pudendal nerve, it is possible to treat hyperreflexia in some of the SCI patients. To maximise the efficacy of this type of ...

COMSOL Multiphysics® Software: Time-Lapse Electrical Resistivity Inversion

T. K. Chou[1], M. Chouteau[1], M. J. Yi[2]
[1]Department of Civil, Geological & Mining Engineering, École Polytechnique de Montréal, Montreal, QC, Canada
[2]Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea

Time-lapse electrical resistivity tomography (ERT) method provides a non-invasive way to monitor subtle sub-surface changes caused by water flow such as in an infiltration test. Problems arise when the inversion models contain artifacts due to measurement errors, rapid change in soil electrical property during measurement time, etc. A new approach was developed by Kim et al. (2004) and (2009) ...

Electrical Scale-Up of Metallurgical Processes

R. Schlanbusch[1], S. A. Halvorsen[1], S. Shinkevich[1], D. Gómez[2]
[1]Teknova, Kristiansand, Norway
[2]Department of Applied Mathematics & ITMATI, Universidade de Santiago de Compostela, La Coruña, Spain

The problem under investigation is electrical scale-up of a generic metallurgical process for primary metal production through resistive heating of slag by electric current, typically supplied by an AC three-phase system. Maxwell’s equations are analyzed revealing that the properties of the solution is determined by the parameter (L/δ)^2, where L is the linear size of the system and δ is the ...

Traveling Plasma Wave Levitation of Objects Supported by Coanda Effect

R. Eisenschmid[1]
[1]OPTIMA pharma GmbH, Schwäbisch Hall, Germany

Electrostatically excited plasma waves can induce a “plasma wind” in the surrounding media or air. The lifted object has a shape of a flying saucer, just for better illustration. A travelling plasma wave propulsion requires a pre-ionized media around the surface and a travelling electrostatic field. A simplified plasma model was used to set up an EFD (electro fluid dynamic) approach into a ...

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