Technical Papers and Presentations

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

The Unroutinary Loads on the LBT Adaptive Secondary Mirror

C. Del Vecchio
INAF-OAA, Firenze, Italy

The thin shell of the LBT Adaptive Secondary Mirror has been manufactured, optically polished, and delivered. The operations and tests required before finally mounting it on the telescope have to be run very carefully, as they imply loads completely different from the ones of the adaptive operational modes - studied in the past with very encouraging results. Deformations and stresses that occur ...

Image Denoising and Segmentation using COMSOL Multiphysics

F. Zama
Department of Mathematics, Bologna University, Bologna, Italy

Partial differential equations have recently become popular and useful tools for several image processing tasks such as image de-noising and segmentation.In this work, we implement a unified image de-noising and segmentation approach which is based on a nonlinear diffusion equation with a reactive term for achieving edge preserving smoothing and segmentation. This model is highly nonlinear and ...

Pre-design of a Molten Salt Thorium Reactor Loop

J. P. Caire, and A. Roure
LEPMI-ENSEE, Saint Martin d'Hères, France

The generation 4 of molten salt reactors using the thorium cycle are characterized by a temperature close to 1000 oC. The very large heat transfers involved between the reactor core and the external parts with minimal thermal losses are a major issue. This study investigated a possible inner loop made of a series of conventional graphite filter plate exchangers, pipes and pumps, using the COMSOL ...

Simulation-based Analysis of the Spatial Sensitivity Function of an Electrical Capacitance Tomography System

A. Fuchs, and H. Zangl
Institute of Electrical Measurement and Measurement Signal Processing, Graz University of Technology, Graz, Austria

This paper investigates the effects of the soft field character of an Electrical Capacitance Tomography system by means of analyzing the 3D sensitivity distribution of the pipe interior using Finite Element Analysis.The aim of the determined sensitivity is to overcome restrictions caused by the soft field without being forced to use (active) guarding strategies.

Vibration Analysis - Gullfaks C Knock Out Drum

S. Sandström
SSM Engineering, Stenungsund, Sweden

An eigenvalue as well as a harmonic response analysis is performed on the Gullfaks C, Knock Out Drum (KOD) including some of the connecting pipe systems. The vibration behavior of two new choke valves and their specific connection to the KOD are of special interest. The main concern is the low frequency induced vibration as a consequence of the platform movements. A frequency band between 0-20 Hz ...

Implementation of EC-NDT for in Depth Detection of Defects in Metallic Plates

M. Cacciola, S. Calcagno, D. De Carlo, F. Laganà, G. Megali, F. C. Morabito, D. Pellicanò, and M. Versaci
Department of Informatics, Mathematics, Electronics and Transportations (DIMET) - "Mediterrane" University of Reggio Calabria, Reggio Calabria, Italy

Eddy Current Non Destructive Testing is exploited to evaluate the structural integrity of metallic objects. The aim of this paper is to detect defects located in depth within the inspected object; within this framework, we studied the modelling of exciting coils useful to detect structural flaws. The simulations have been carried out by considering the movement of the coil over a structural steel ...

Design of an Anti-Magnetic Screen for the Neutron Decay Spectrometer aSPECT

G. Konrad1, F. A. Guardia1, S. Baesler1,2, M. Borg1, K. Eberhardt3, F. Gluck4,5, W. Heil1, S. Hiebel1,6, R. M. Horta1, and Y. Sobolev1
1Universität Mainz, Institut fur Physik, Mainz, Germany
2University of Virginia, Department of Physics, Charlottesville, VA, USA
3Universität Mainz, Institut for Kernchemie, Mainz, Germany
4Universität Karlsruhe, Experimentelle Kernphysik, Karlsruhe, Germany
5Research Institute for Nuclear and Particle Physics, Theory Department, Budapest, Hungary
6Sekels GmbH, Ober-Mörlen, Germany

This paper deals with the design of an anti-magnetic screen for a superconducting retardation spectrometer using COMSOL Multiphysics.COMSOL was used to model and optimize the anti-magnetic screen to obtain a design that reduces the exterior magnetic field by a factor of about 10, yet does not affect the internal magnetic field and its homogeneity, and that makes sure that the additional forces ...

Analysis of a Spatial Filtering Design for Capacitive Flow Measurements

D. Hrach, A. Fuchs, and H. Zangl
Institute of Electrical Measurement and Measurement Signal Processing, Graz University of Technology, Graz, Austria

In this paper, a simulation of a capacitive flowmeter utilizing a spatial filtering technique is presented. The flowmeter consists basically of ring shaped electrodes placed sequentially in the flow direction on the outside of a pipe. The paper introduces an electrode layout and describes the modeling of the electrodes to achieve the required simulation accuracy.We show the functionality of the ...

Dual Solutions for Viscous Mixed Convection Flows in a Vertical Circular Duct: A Numerical Benchmark

S. Lazzari1, A. Barletta1 , E. Magyari1,2, and F. Piccinini3
1Dipartimento di Ingegneria Energetica, Nucleare e del Controllo Ambientale (DIENCA), University of Bologna, Bologna, Italy
2Institute of Building Technology, ETH - Zürich, Zürich, Switzerland
3Biomedical Engineering, Engineering School of Cesena, Cesena, Italy

Forced and free convection flow in a vertical isothermal circular duct is studied by taking into account the internal heating due to viscous dissipation. The momentum and energy balance equations lead to a nonlinear boundary value problem that is solved numerically by means of the finite-element software COMSOL Multiphysics.For any prescribed value of the average velocity smaller than a maximum, ...

Geodynamic Models of the Vøring Volcanic Margin

T. Pedersen
Institute for Energy Technology, Kjeller, Norway

Volcanic margins are characterized by excessive magmatic activity. One of the most studied volcanic margins is the Vøring margin, offshore mid-Norway. The large volumes of magmatic rocks found there are believed to have been produced by the melting of an abnormally hot mantle. We use COMSOL Multiphysics to investigate the hypothesis that the source of this thermal anomaly was a mantle ...

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