In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Evaluation of the Lightning Strikes on Carbon Fibers Panels for Aircraft Structural Parts

B. De Vivo, P. Lamberti, G. Spinelli, V. Tucci
Depart. of Inform. Eng., Electr. Eng. and Appl. Math. – DIEM, University of Salerno, Italy

Airliners are often subjected to dangerous atmospheric and weather hazards among which lightning strikes represent a threat for flight safety. Recently, the use of Carbon Fibers Reinforced Composites as structural parts in aircrafts as an alternative to traditional metallic materials. Unfortunately, most composites are not able to dissipate lightning currents as the traditional metals. Such ...

RF Magnetic Field Simulation of a Novel Planar DNP-NMR Coil

A.I. Dimitriadis [1], M. Soundararajan [1], D. Yoon [1], E. de Rijk [2], J.-Ph. Ansermet [1]
[1] Institute of Condensed Matter Physics, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
[2] SWISSto12 SA, Lausanne, Switzerland

INTRODUCTION: Nuclear magnetic resonance (NMR) spectroscopy is a broadly used research technique that exploits the magnetic properties of atomic nuclei with non-zero spin in order to determine the physical/chemical properties of the molecules in which they are contained. However, NMR has fundamental sensitivity limitations, as a consequence of the small energy difference between nuclear spin ...

Potential Distribution Along a 500kV Polymer Insulator in Presence of a Pollution Layer

D. S. Lopes [1], J. M. B. Bezerra [1],
[1] Universidade Federal de Pernambuco, Recife, PE, Brazil.

The objective of this study is to assess polymeric insulators subjected to polluted environments. The study cases were conducted on polymeric insulators of 500 kV lines. All analyses were carried out with computer simulations, employing the software COMSOL Multiphysics® to calculate the voltage distribution on the surface of the insulators with deposits of pollution layers. Pollution in the ...

Estudo da Formação de Poros na Membrana Durante a Eletroporação de Células Biológicas

L. S. Pereira [1], G. B. Pintarelli [1], D. O. H. Suzuki [1],
[1] Universidade Federal de Santa Catarina, Florianópolis, SC, Brasil

Este trabalho tem como objetivo o estudo do fenômeno da eletroporação, mais especificamente, a formação de poros nas membranas plasmática e nuclear, a fim de identificar previamente a influência de cada parâmetro ao longo do processo, buscando configurações que proporcionem melhores resultados. As simulações e estudos foram realizados com o software COMSOL Multiphysics ®. O Módulo AC/DC e a ...

Sensitivity Plots using COMSOL Multiphysics®: A Tool for Optimizing Geophysical Field Survey

D. Mishra [1], Shalivahan [1], A. Banerjee [1],
[1] Indian School of Mines Dhanbad, India

Electrical resistivity surveys have been used for many decades in hydro geological, mining and geotechnical investigations. Various types of electrode combinations have been tested. But different array gives different type of response over same sub-surface feature. Response of different array is determined by sensitivity of that array. The sensitivity function of an array describes about the ...

电磁力作用下金属小车的减速刹车过程研究

李晓南 [1], 刘国强 [1],
[1] 中国科学院电工研究所,北京,中国

利用惯性力学和电磁学,研究了一个金属小车沿着磁铁铺就的轨道做减速直线运动。其中,小车也可以看成是携带等量的磁铁剩磁,且沿着铁磁轨道减速运动。通过赋予小车一个初速度,例如100 m/s,然后再根据实际情况、赋予它一个特征密度,即小车有了一定的质量。当认为小车沿水平方向的轨道减速运动,忽略重力、空气阻力等其他一些影响因素时,小车将只受电磁的洛伦兹力的作用,而逐渐减速到零。 利用最新版的 COMSOL Multiphysics®,建模过程中,主要用到了“磁场和电场(mef)”和“全局常微分和微分代数方程(ge)”接口,涉及到的动力学和电磁学方程为 dv/dt=F/m F ⃗=∫_(V_vehicle)▒〖(J_induced ) ⃗×B ⃗dv〗 J_(i_y)=σ(v_z∙B_x-v_x∙B_z ) v 为小车即时速度,F 为洛伦兹力,J 为感应产生的涡流,v 为速度,B ...

Temperature Distribution in High Voltage Dummy Cable

G.Y. Sun[1], O. Sekula[1], and C. Albanbauer[1]
[1]Brugg Kabel AG, Brugg, Switzerland

A 2D model of coupled electricthermal application is used to calculate the temperature distribution in a high voltage dummy cable laid in free air, where no high voltage is applied. Resistive loss heats the cable while the surrounding air cools it down. The steady-state condition is reached when heat balances. The steady-state temperature depends not only on the resistive loss but also on the ...

A Model for High Temperature Inductive Heating

S.A. Halvorsen[1]
[1]Teknova AS, Kristiansand, Norway

COMSOL Multiphysics has been applied to develop a model for inductive heating. A coarse, lumped model of the interior of a high temperature reactor is coupled to finite element models for the electromagnetic field, the temperature distribution outside the reactor, and mechanical stresses in the crucible. The model can be applied to study operational conditions, thermal stresses, or design ...

Calculation of the Magnetic Field Intensity in a Rectangular Conductor Carrying Current in Electromagnetism Introductory Courses

J.C. Olivares-Galvan[1], I. Hernandez[2] , P.S. Georgilakis[3], and L.E. Campero[1]

[1]Universidad Autónoma Metropolitana, Azcapotzalco, Mexico, D.F.
[2]Centro de Investigacion y de Estudios Avanzados del IPN, Unidad Guadalajara, Guadalajara, Jalisco, Mexico
[3]School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece

This paper describes a type of didactic material used when teaching electromagnetism. The purpose is to guide the students to verify the results of a Finite Element (FE) simulation using those obtained analytically. This procedure has shown to be of great help during their learning of the FE method. The example in this paper uses a 2D analytical method to estimate the magnetic field generated by ...

Interactions of Magnetic Particles in a Rotational Magnetic Field

A. Weddemann, A. Auge, F. Wittbracht, S. Herth, A. Hütten
Bielefeld University, Germany

Particle-particle interactions are usually neglected when considering the behaviour of magnetic particle's so called magnetic beads in e.g. a microfluidic device. However, if the particle density exceeds a critical limit, this assumption might not lead to proper results anymore. In this paper the particle-particle interaction of magnetic beads in an external magnetic field will be discussed. It ...