M. Herlitschke, M. Blasl, and F. Costache
Fraunhofer Institute for Photonic Microsystems
3D FEM simulation of millimeter-scale, complex electro-optically induced waveguide based devices demands the use of grids with more than several million nodes. Hence the simulation could take substantial time and require large amounts of available memory. This paper presents a computation algorithm based on the conversion of an initial 3D waveguide structure into an analogous 2D structure, ...
M. Goncalves, T. Makaryan, G. Papageorgiou, U. Herr, and O. Marti
Ulm University - Inst. of Experimental Physics, Ulm, Germany
Yerevan State University, Yerevan, Armenia
Ulm University - Institute of Micro and Nanomaterials, Ulm, Germany
Surface enhanced Raman scattering (SERS) investigations of silver and gold triangular nanoparticles reveal strong field enhancements at the corners of the particles. Though the measurements were done at wavelengths far from the surface-plasmon resonance of the particles, large field enhancements can be generated by near-field coupling between the triangular particles and smaller metal ...
Fluid-Structure Interaction Modeling for an Optimized Design of a Piezoelectric Energy Harvesting MEMS Generator
I. Kuehne, A. van der Linden, J. Seidel, M. Schreiter, L. Fromme, and A. Frey
Siemens AG, Corporate Research & Technologies, Munich, Germany
Comsol Multiphysics GmbH, Göttingen, Germany
This paper reports the design of a piezoelectric energy harvesting micro generator for an energy autonomous tire pressure monitoring wireless sensor node. For our design we use a piezoelectric MEMS generator approach without additional mass. The intrinsic mass of the cantilever is in the microgram region and the resulting acceleration forces are very small. The generator has a triangular ...
Transient Electromagnetic-Thermal FE-Model of a SPICE-Coupled Transformer Including Eddy Currents with COMSOL Multiphysics 4.2
H. Neubert, R. Disselnkötter, and T. Bödrich
Technische Universität Dresden, Institute of Electromechanical and Electronic Design, Dresden, Germany
ABB AG, Forschungszentrum Deutschland, Ladenburg, Germany
Current transformers are used to measure currents in power grid systems. They are characterized by strong interactions between external electrical sources and loads respectively and the magnetic subsystem. Self-heating due to losses has to be considered because of the temperature-dependent material behaviour. The paper presents a transient 3D FEA transformer model which includes a H(|B|) ...
Military University of Technology
The article presents the process of verification of the passive magnetic bearing by the Comsol Multiphysic program. There is shown construction of the radial passive magnetic bearing PMB60x85x20-5, which was designed in the Military University of Technology. The distribution of the magnetic flux density and the static characteristic of the bearing were estimated by the Comsol Multiphysic. The ...
I. Bogdanov, J. Kpahou, and A. Kamp
Open and Experimental Centre for Heavy Oil (CHLOE)
University of Pau
Direct numerical simulation of single- and two-phase flow in real pore systems is addressed in our paper. The X–ray computed micro-tomography technique has been applied first to reconstruct in details a real pore space of a subcentimetric sample. Making use of dedicated software (ScanIP) the generated porous medium images has been processed to build a 3D pore space geometry. Finally, based ...
O. Fritz, M. Ljuslinder, and B. Doser
ABB Switzerland Ltd, Corporate Research, Baden-Dättwil, Switzerland
ABB Switzerland Ltd, High Voltage Products, Wettingen, Switzerland
We present examples of the use of COMSOL Multiphysics for the solution of electrical conduction in varistors coupled to the solution of long-term heat-transport through conduction and convection. We fit measured power-loss and impedance data with analytic functions in order to simulate instant electric and transient thermal processes in one go. We systematically compare our results to data ...
E. Holzbecher, P. Oberdorfer, F. Maier, and Y. Jin
Georg-August Universität Göttingen
Geothermal heat production from deep reservoirs (5000-7000 m) is currently examined, not only in Germany. Our reference set-up consists of two pipes within a single borehole: one for pumping. We examine a design, where a single borehole splits into two legs at a certain depth. The two legs are connected by highly permeable geological, natural or artificial strata in the deep subsurface. The ...
COMSOL API Based Toolbox for the Mixed-Level Modeling of Squeeze-Film Damping in MEMS: Simulation and Experimental Validation
M. Niessner, G. Schrag, J. Iannacci, and G. Wachutka
Institute for Physics of Electrotechnology, Munich University of Technology, Munich, Germany
MEMS Research Unit, Fondazione Bruno Kessler, Povo di Trento, Italy
We present an easy-to-use toolbox for the automated generation of reduced-order mixed-level models for the evaluation of squeeze-film damping in microelectromechanical systems. The toolbox is programmed in JAVA and heavily exploits the functionality provided by the COMSOL API. The results obtained from mixed-level model simulation performed in COMSOL Multiphysics agree very well with ...
F. Loos, and H.-D. Ließ
Universität der Bundeswehr München
The purpose of this work is to investigate the triggering behaviour of safety fuses for mobile on board supply systems. The influence of different materials and shapes of the fuses on the triggering behaviour are analyzed. Furthermore, the simulation results obtained by the use of COMSOL Multiphysics® are compared to experimentally achieved data. For the transient simulation of the heat ...