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.

Numerical Optimization of Heating for High-Speed Rotating Cup by Means of Multiphysics Modeling and its Experimental Verification - new

K. Kyrgyzbaev[1], M. Willert-Porada[1], M. Terock[1]
[1]University of Bayreuth, Chair of Materials Processing, Bayreuth, Germany

The physics of rotating cups and disks is an important research subject in many areas of engineering. The rotating cup/disk has been employed in many industrial applications such as spin-coating of phosphor on television screens or photoresist films on silicon wafer, concentrating solutions by evaporation, centrifugal atomization of metal melts, and glass flakes production. In this work the ...

Calculating Impedance of a Common Mode Choke in High Frequency Regime

J. Lin [1],
[1] Pitotech Co. Ltd., Changhua City, Taiwan

Common mode chokes are good EMI filters in electronic power systems [1]. For such devices, values for their impedance are critical to their performances as noise filters. In this study, a two-step finite element approach is employed to study the impedance variations of a ferrite-core common mode choke operating at high frequencies (0.1 to 10 MHz) [2]. Extraction of inter-winding parasitic ...

Prediction of Transformer Load Noise

M. Kavasoglu[1], R. Haettel[1], and C.H. Ploetner[2]
[1]ABB Corporate Research, Västerås, Sweden
[2]ABB Transformers, Varennes, Canada

Transformers, as any other industrial products, have to comply with various requirements on noise levels. Three main sources of noise can be identified in transformers: no-load noise or core noise generated by magnetostriction in the core steel laminations, load noise produced by electromagnetic forces in the windings and noise due to auxiliary equipment such as fans and pumps used in the ...

On the Simulation of the Lightning Strikes to Complex Grounded Structures

M. Becerra
Royal Institute of Technology
School of Engineering
Electromagnetic Engineering Lab
Stockholm, Sweden

There is a considerable world-wide interest among lightning protection engineers and designers on the improvement of the standard procedures to assess the location of the most vulnerable places on complex structures to be struck by lightning flashes. This paper presents the implementation of the Self-consistent Lightning Interception Model in Matlab by using the COMSOL Multiphysics 3.5 ...

Finite Element Simulation of Induction Heating of a Tubular Geometry

K. Madhusoodanan[1], J. N. Kayal[1], P. K. Vijayan[1]
[1]Bhabha Atomic Research Centre, Trombay, Mumbai, India

In Pressurised Heavy Water Reactors (PHWRs), the fuel bundles are located inside horizontal pressure tubes made of Zr 2.5 wt% Nb alloy. During reactor operation, pressure tubes undergo corrosion reaction with the heavy water coolant flowing through it and picks up a part of the hydrogen evolved. Assessment of the hydrogen concentration in the pressure tube forms part of the programme to assess ...

The Swelling Responsiveness of pH-Sensitive Hydrogels in 3D Arbitrary Shaped Geometry

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

The pH-sensitive hydrogels are responsive to the pH of surrounding solution, which often resemble to biomaterials. Recently, pH-sensitive hydrogels are widely used in various devices as sensing media. We present the simulation of swelling characteristic of 3D-arbitarary-geometry, pH-sensitive hydrogel in steady state conditions. Three nonlinear partial-differential equations that are ...

Investigation of a Hybrid Winding Concept for Toroidal Inductors Using 3D Finite Element Modeling

H. Schneider[1], T. Andersen[1], J. D. Mønster[1], M. P. Madsen[1], A. Knott[1], M. A. E. Andersen[1]
[1]Technical University of Denmark, Lyngby, Denmark

This paper investigates a hybrid winding concept for a toroidal inductor by simulating the winding resistance as a function of frequency. The problem of predicting the resistance of a non-uniform and complex winding shape is solved using 3D Finite Element Modeling. A prototype is built and tested experimentally to verify the simulation results. Finally, the COMSOL Multiphysics® LiveLink™ to ...

Estudo Numérico da Eletroquimioterapia em Tumor Cutâneo com Diferentes Configurações de Eletrodos - new

G. Neves[1], D. Suzuki[1], J. Alvim[1], M. Rangel[2]
[1]Universidade Federal de Santa Catarina, Florianópolis, SC, Brasil
[2]Vet Câncer Oncologia Veterinária, São Paulo, SP, Brasil

A eletroquimioterapia é um tratamento de câncer que utiliza a combinação de agentes quimioterápicos e campos elétricos. A base teórica por trás dessa aplicação é a eletroporação. Esse fenômeno biológico consiste na abertura de poros na membrana celular devido à aplicação de pulsos elétricos. Este trabalho analisa o comportamento do campo elétrico gerado por pulsos elétricos aplicados em ...

Topographic Effects on Radio Magnetotelluric Simulations on Levees: Numerical Modeling for Future Comparison With Fields Results

R. Duval[1], C. Fauchard[1], R. Antoine[1]
[1]ERA23-IFSTTAR, Laboratoire des Ponts et Chaussées de Rouen, CETE-Normandie Centre, France

We study the topography influence of levees on the electric resistivity signal obtained with the Radio-Magnetotelluric method. Field measurements have been modeled with COMSOL, using the AC/DC and RF Modules. A levee situated in Orléans along the Loire river (France) has been considered in order to design a model tacking account of the skin depth and the incident wavelength, keeping a constant ...

基于 ALE 方法的脉冲磁体不可逆电感变化计算

蒋帆 [1], 孙衢骎 [1],
[1] 武汉脉冲强磁场中心,武汉,湖北,中国

目前,脉冲磁体广泛采用导体绕组和加固材料分层交替绕制的工艺(内部层间加固),以提高磁体的整体结构强度。磁体在长期的放电工作过程中,反复经历强电磁力的作用,导体材料(一般为纯铜、铜基合金以及铜基复合材料)在重复的加卸载过程中存在着塑性应变的累积效应,即棘轮效应。导体材料塑性应变的逐渐累积,导致了磁体不可逆电感值的不断增加。因此,磁体的不可逆电感变化可表征磁体内部的整体变形情况,可用于脉冲磁体的疲劳失效预测。 本文基于 COMSOL Multiphysics® 5.1 软件,对脉冲磁体的放电过程建立了电路、电磁场、温度场及结构场的二维轴对称全耦合模型。考虑了放电过程中集肤效应对磁体电阻、电感的影响;在结构场中引入了接触对,采用罚函数法对磁体内部的层间分离机制进行了有效的模拟;利用耦合变量,基于 ALE 方法计算了脉冲磁体在服役过程中 ...