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Modeling of Grounding Systems Considering the Soil Ionization Effect Using COMSOL Multiphysics® Software

The soil ionization is an important phenomenon to be considered in the analysis of grounding electric systems. In this way, this work has proposed a procedure that allows modeling grounding systems with COMSOL Multiphysics and MATLAB® taking into account the soil ionization effects according to the Dynamic and Energy Balance models. Comparisons between calculated results and those reported in the technical literatu ...
www.comsol.com/paper/18853

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. Particularly Component C is used and is characteristic of current with ...
www.comsol.com/paper/9080

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 ...
www.comsol.com/paper/11073

Current Distribution and Magnetic Fields in Complex Structures Using Comsol Multiphysics

The present paper presents numerical calculations of the magnetic fields and the current distribution within a wind turbine nacelle. The results are used by control system engineers designing panels and cables, who must ensure that the immunity of the equipment complies with the environment within the turbine. Since the release of the International standard concerning lightning protection of wind turbines, IEC ...
www.comsol.com/paper/10873

Modeling of Complex Structures in Electrotechnology

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. His work is focused towards electromagnetic and multiphysics modeling of high voltage power products and system components.Göran Eriksson was one of the keynote speakers at the COMSOL User's Conference, fall 2009 in ...
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 electric field ...
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

Numerical Analysis of the Response of Thick Wires to Extreme Dynamic Electro-Mechanical Loads

Research at Fraunhofer EMI addresses the response of materials in extreme dynamic loads. Besides mechanical or thermal loads, intense electric pulse currents also represent an extreme dynamic load. Experimentally, metallic samples, mainly thick wires, were electro-mechanically loaded with currents up to 400 kA. For this purpose, a test rig containing a high-voltage pulsed power supply and high-performance switches wa ...
www.comsol.com/paper/18399

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

Comparison of Power Transmission Line Models with Finite Elements

as lightning and switching phenomena. The COMSOL model applies the AC/DC Module (Electrostatics and Magnetic Fields physics interfaces) for the calculation of electric fields, current density and equivalent electric parameters (impedance and admittance), using 2D approximation, being a reasonable premise for the present study. A parametric sweep was applied at the ground conductivity, to compute the influence in ...
www.comsol.com/paper/19215

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

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

The Optical Properties of a Truncated Spherical Cavity Embedded in Gold

The use of plasmonic effects to dramatically enhance the electromagnetic field near the surface of a metallic nanostructured surface has grown into a large research area in the effort to take advantage of the surface enhanced field. In this paper the electromagnetic field near a nano-sized truncated spherical cavity embedded in a gold subs ...
www.comsol.com/paper/6891

Coupled Electric-Thermal-Fluid Analysis of High Voltage Bushing

Modern power transmission systems are in general designed to operate at high voltages in order to reduce resistive losses generated by high currents. This, however, tends to increase the risk for dielectric breakdown or flashovers if the equipment is not properly designed to withstand the stress. The present work illustrates how multiphysics simulations can be used to analyze and predict the electric and thermal stre ...
www.comsol.com/paper/13288

Propagation of Cathode-Directed Streamer Discharges in Air

Streamers are considered as main cause of electrical breakdown in air at atmospheric pressure. A streamer is an ionization wave propagating in neutral gas which is converted into low-temperature plasma behind its front. A streamer model is based on drift-diffusion approach where space and time evolution of densities of charge carriers is considered. It results in three convection-diffusion PDEs coupled with Poisson ...
www.comsol.com/paper/16228

Web-Based 3D Visualization for COMSOL Multiphysics® Software

A web based visualization solution for three dimensional simulation results of COMSOL Multiphysics® is described. With it, mobile clients with low bandwidth as well as desktop computers with high bandwidth connections get able to show simulation results without the need of installing specialized software. To do so, a modern web browser is required. Both touch gestures and common input techniques supports real time i ...
www.comsol.com/paper/18271