COMSOL Search

Showing results 1-20 of 25

On the Simulation of the Lightning Strikes to Complex Grounded Structures

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 programming language. This state-of-the-art physical model simulates the transient lightning attachment process by considering the time-varying electric field around a complex structure, which is here computed in three ...
www.comsol.com/paper/11073

Modeling of Lightning Direct Effects - Interaction of Continuing Current with Aluminum Skins

An interaction of aluminum aircraft skins with a laboratory-simulated, low-level, long-duration, continuing current representative of a natural lightning flash was modeled with COMSOL Multiphysics. For the analysis of the lightning direct effects on aircraft, the external environment is represented by the idealized current components ...
www.comsol.com/paper/9080

Current Distribution and Magnetic Fields in Complex Structures Using Comsol Multiphysics

. Since the release of the International standard concerning lightning protection of wind turbines, IEC 61400-24, it has become mandatory to document the effectiveness of the installed lightning protection system. In this respect, numerical modelling of magnetic fields and current distribution is a natural part of establishing the zoning concept, also required in the GL2010 ...
www.comsol.com/paper/10873

Electromagnetic Shielding of Impulse Magnetic Fields Using Thin-Walled Shells

. One of such demands is EMC of the on-board electrical and electronic systems, namely the stability of the equipment against external electromagnetic influences: powerful impulse electromagnetic fields, caused by lightning, and high-intensive radiated fields, created by powerful ground transmitters ...
www.comsol.com/paper/11926

Modeling of Complex Structures in Electrotechnology

:Göran Eriksson received his Ph.D. in the field of Plasma Physics and Theoretical Electrotechnics from Uppsala University. After working for more than 12 years at Saab AB, mainly with numerical simulations of electromagnetic phenomena such as lightning damage effects, he is now employed by ABB Corporate Research ...
www.comsol.com/paper/7215

Drift of Space Charge Produced by Glow Corona During Thunderstorms

Glow corona discharges are generated from tall objects during thunderstorms previous to a lightning strike. These discharges generate space charge which can hinder the development of subsequent discharges. In order to quantify the shielding effect of positive glow corona, a transient, two dimensional model of the drift of the space charge generated on the tip of tall objects under the thundercloud ...
www.comsol.com/paper/11077

Using COMSOL to Solve for Currents along a Thin-Wire Antenna Excited by a Lumped Source

In this paper, we will present simulation results obtained using COMSOL RF module for the current along a wire antenna in both frequency and time domains. The structure is excited through a lumped (voltage or current) source at its center. For the frequency domain simulations we compare the results with the Numerical Electromagnetics Code (NEC-4) and for the time domain results we compare them with the prediction of ...
www.comsol.com/paper/9223

Modeling Electromagnetic Wave Propagation in Planetary Cavities using COMSOL Multiphysics Tools

The study of extremely low frequency electromagnetic wave propagation in the ionospheric cavities of celestial bodies in the Solar System follows an approach similar to that developed for the Earth. It contributes to the characterization of the atmospheric electric circuit and associated energy sources, and to the identification of the inner and outer cavity boundaries. A wave propagation, 3D finite element ...
www.comsol.com/paper/2940

Virtual Prototyping

Virtual prototyping is used for understanding, verifying, planning, controliing, and optimizing a technical application. It the industrial component computational science and engineering and can be called "the third pillar of modern science". The future of virtual prototyping will be multiscale and multiphysics models and simulations. --------------------------------- Keynote speaker's biography: Bjorn Eng ...
www.comsol.com/paper/1951

Electrical Conductivity Modeling and Validation in Unidirectional Carbon Fiber Reinforced Polymer Composites

Carbon fiber (CF) reinforced polymer composites (CFRP) have begun to replace Al-Zn-Mg alloys in applications which require high strength-to-weight ratios. The anisotropy of CFRP composites is a result of melt crystallized extrusion techniques that impart an inherent directionality to the CFs and the associated material’s properties. Electrical conductivity was modeled across the entire CF loading range (from neat p ...
www.comsol.com/paper/15958

Low Frequency Electromagnetic Wave Propagation in Large Cavities, Study of the Cavity of Titan after the Cassini-Huygens Mission

The propagation of low frequency electromagnetic waves in the cavity of celestial bopdies with ionospheres has been studied, namely for inferring thunderstorm and lightning activity. The measurement of resonant states provides useful information for the analysis of the electric environment in the cavity ...
www.comsol.com/paper/1524

Using the Electrical Field Analysis for Assessment of the Influence of Paper Insulation on Discharge Initiation in Oil

Conclusions about the influence of paper insulation on the electrical discharge initiation in mineral oil may be drawn on the basis of experimental studies. However, in some cases, these conclusions may be supported by electrical field analysis. Determination of maximum values of electrical field stress in the vicinity of model electrode setups may bring a new information about initiation processes in paper-oil insul ...
www.comsol.com/paper/14934

Optimization of Artificial Diffusion Stabilization Techniques and Corresponding Mesh Density Distribution in Drift Dominated Transport of Diluted Species

This paper presents an optimized combination of artificial diffusion techniques to stabilize a drift dominated streamer discharge model which includes COMSOL Multiphysics’ Transport of Diluted Species modules for positive ion, negative ion, and electron charge densities, coupled through the Electrostatic module. A Thermal Conduction and Convection module is responsible for the heat transfer in the model. Optimal 2D ...
www.comsol.com/paper/13014

Electrical and Thermal Analysis of an OLED Module

This paper presents the electrical and thermal analysis of an OLED module. The OLED module consists of the OLED tile and the DC-DC converter incorporated in its backplane. The DC-DC converter is realized as an integrated circuit and its inductor is embedded in the the backplane. The DC-DC converter is highly efficient, but a fraction of the electrical power is dissipated in the integrated circuit and the planar induc ...
www.comsol.com/paper/13217

Prediction and Optimization of Surface-Enhanced Raman Scattering Geometries using COMSOL Multiphysics

Raman spectroscopy is a commonly used tool in biodiagnostics and sensor technology. Surface-enhanced Raman scattering provides high signal enhancements especially at nanostructured metallic surfaces. In this paper the electromagnetic Raman enhancement from different metallic nanostructures - including gold coated gratings, spherical and hemispherical particles - is calculated by using the finite element met ...
www.comsol.com/paper/5337

Calibrating electric instruments of the Huygens probe and modelling the dielectric properties of the atmosphere and of the surface of titan

In 14 January, 2005, the Huygens Probe has descent through the atmosphere of Titan and has survived to touchdown, collecting data in the atmosphere and on the surface of the largest moon of Saturn. One of the instruments, the Huygens Atmospheric Structure Instrument (HASI), includes the Permittivity, Waves, and Altimetry (PWA) analyser, which is a subsystem for studying the electric activity of the atmosphere and for ...
www.comsol.com/paper/1208

Study of the Electric Field Intensity in Bushing Integrated ZnO Surge Arresters by Means of Finite Element Analysis

In this paper, the electric field in different types of ZnO surge arresters has been investigated by means of finite element modeling using COMSOL Multiphysics. Both conventional and novel built-in-bushing type arresters were studied. Electric field modeling helps designers consider important factors affecting the maximum field intensity in the arrester, avoiding damages to the arrester insulating system that bri ...
www.comsol.com/paper/1675

A Novel Mechanical Stress Measurement Method Applied to Wind Turbine Rotor Blades

Rotor blades for wind turbines are made of GFRP material. They have to be designed to withstand wind and weather over their approximately 20 years of lifetime. The ability to monitor the mechanical stress is crucial in order to reduce maintenance costs and to maximize operational availability. This paper presents the combination of SPICE® and COMSOL Multiphysics®, in order to reduce computation time. This allow ...
www.comsol.com/paper/14967

Numerical Simulation of a Human Body Subjected to Electrostatic Fields for Study of the Turin Shroud Body Image

The TS (Turin Shroud) [1,2] is a fine linen fabric showing a not yet explainable [3] double body image of a scourged and crucified man stabbed on the side. Many hypotheses have been formulated without success [4] and perhaps the most reliable is one correlated to the Corona Discharge [5] that supposes the presence of an intense electric field, amplified by the presence of ionization induced by radon. Before to formul ...
www.comsol.com/paper/13362

Modell zur numerischen Simulation der thermischen Stabilität von Metalloxid Ableitern

Moderne Überspannungsableiter bestehen aus einer halbleitenden Zinkoxidkeramik, die auf-grund ihrer nichtlinearen elektrischen Charakteristik ein spannungsbegrenzendes Verhalten zeigt. Aufgrund des negativen Temperaturkoeffizienten des Sperrstromes, kann es zu einem „thermischen Davonlaufen“ nach einem zu hohen Energieeintrag bei einem Ableitvorgang kommen. Die Belastbarkeitsgrenze muss durch aufwendige Laborexp ...
www.comsol.com/paper/1218