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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.

Semismooth Newton Method for Gradient Constrained Minimization Problem

S. Anyyeva, and K. Kunisch
Institute of Mathematics and Scientific Computing
Karl Franzens University
Graz, Austria

We treat a gradient constrained minimization problem which has applications in mechanics and superconductivity. A particular case of this problem is the elastoplastic torsion problem. In order to solve the problem we developed an algorithm in an infinite dimensional space framework using the concept of the generalized Newton derivative. The Desktop environment of COMSOL Multiphysics 4.1 was ...

On the Formation of a Sticking Layer on the Bearing during Thin–Section Aluminium Extrusion

X. Ma[1], M.B. de Rooij[2], and D.J. Schipper[2]

[1]Materials Innovation Institute, Enschede, The Netherlands
[2]University of Twente, Enschede, The Netherlands

This paper describes the use of COMSOL Multiphysics® to determine the shear layer thickness in thin–section aluminum extrusion, based on the minimum work criterion. The studied two aluminum alloys are AA 6063 and AA 7020. The results show that a continuous shear layer featuring shear localization due to localized thermal softening is not possible to form under typical thin&ndash ...

Dynamic Simulation of Bone Morphogenetic Protein Patterning in a 3D Finite-Element Model of the Danio Rerio Embryo

D. Umulis, and S. Lee
Purdue University
West Lafayette, IN

Zebrafish development of the dorsoventral axis relies on the spatiotemporal distribution of Bone Morphogenetic Protein (BMP) signaling, which is regulated by numerous secreted molecules such as Tolloid, Sizzled, and Chordin. The rich dorsal/ventral patterning network must achieve both spatial precision in the patterning of downstream targets and confernspatial precision at distinct time points ...

Photon Migration Through Multiple Layers of Biological Tissue

M.S. Yeoman[1], E. Sultan[2]
[1]Continuum Blue, Tredomen, Ystrad Mynach, United Kingdom
[2]College of Technological Studies, PAAET, Adailiyah, Kuwait

The modeling of light propagation through multiple layers of biological tissue are assessed & compared to the theoretical predictions by Perelman at al. [94 & 95] of the most-favorable-path (MFP). The MFP on which photons will be found can be obtained from the path of the net flux propagation using the diffusion equation. The diffusion equation is valid when studying diffuse light propagation, ...

Modeling Dispersal of Genetic Information in Structured Agricultural Landscapes with Partial Differential Equations

K. Lipsius, and O. Richter
Institute of Geoecology, TU Braunschweig, Germany

We present a model for plant dispersal in agricultural landscapes to evaluate the gene dispersal from genetically modified (GM) plants. Dispersal from seed and pollen is modeled with partial differential equations. In scenarios, we investigated the effect of roadside application of non-selective herbicides on dispersal of herbicide tolerant oilseed rape (HT OSR). We showed that OSR growing on ...

Computation of Three-Dimensional Electromagnetic Fields for an Augmented Reality Environment

A. Buchau, and W. Rucker
Institut für Theorie der Elektrotechnik, Universität Stuttgart, Germany

Augmented reality is predestined for visualization of electromagnetic fields in air or inside transparent matter. Real existing objects are studied and invisible electromagnetic fields are added as virtual objects. Hence, experts as well as students are able to connect electromagnetic fields easily with studied objects. They can concentrate on physical effects instead on reading figures. Here, ...

Electromagnet Shape Optimization using Improved Discrete Particle Swarm Optimization (IDPSO)

R. S. Wadhwa[1], T. Lien[1], and G. Monkman[2]
[1]NTNU Valgrinda, Inst. for produksjons- og kvalitetstek., Trondheim, Norway
[2]FH Regensburg, Regensburg, Germany

The magnetic field gradient produced by an electromagnet gripper head depends on its design. Stochastic Methods offer certain robustness to the design optimization process. In this paper, Improved Discrete Particle Swarm Optimization (IDPSO) searching technique is applied to the shape and magnetic field gradient optimization of an electromagnet head. The magnetic field and forces are ...

Multicomponent Diffusion Applied to Osmotic Dehydration - new

H. Cremasco[1], K. Angilelli[1], D. Borsato[1]
[1]Universidade Estadual de Londrina, Londrina, Paraná, Brazil

The transfer of sucrose and fructooligosaccharides to melon and water to solution was modeled based on generalized form of Fick’s second law for simultaneous diffusion and resolved by the finite element method using the software package COMSOL Multiphysics® software. The diffusion coefficients, the mass transfer coefficient and the Biot number were determined using the simplex optimization ...

Finite Element Analysis of Molecular Rydberg States

M.G. Levy[1], X. Liang[1], R.M. Stratt[1], and P.M. Weber[1]

[1]Department of Chemistry, Brown University, Providence, Rhode Island, USA

Identifying molecules requires associating molecular structures with their electronic energy levels. In this paper we introduce a novel technique for the calculation of molecular Rydberg levels. The technique allows for easy visualization of the associated wavefuntions to make unambiguous assignments. The value calculated for the 3p state of trimethylamine is most closely in agreement with ...

Rapid Control Prototyping for the Production of Functionally Graded Materials with Tailored Microstructural Properties Utilizing Comsol Multiphysics

J. Clobes[1,2], H.-J. Watermeier[2], M. Alsmann[2], H. H. Becker[2], and K. Steinhoff[1]
[1]University of Kassel - Chair of Metal Forming Technology, Kassel, Germany
[2]Volkswagen AG, Kassel, Germany

Within the field of hot metal bulk forming the demand arises for fully three-dimensionally tailored properties at the microstructural level, nevertheless, reaching a predefined geometry with such tailored properties puts high requirements on the control mechanisms utilized in the process chain for combined heating, metal forming, and cooling processes. A simulation based rapid control ...