Events

EU Regional School - Pingen Seminar

Location: AICES Seminar Room 115, 1st floor, Schinkelstr. 2, 52062 Aachen

Prof. Dr. Georg Pingen - Introduction to Topology Optimization for Fluids

Department of Engineering Union University, USA

Abstract

The short course will provide a practical introduction to topology optimization for fluids. Attendees will be provided with a functional MATLAB based flow topology optimization algorithm using the lattice Boltzmann method and a sequential convex programming (SCP) based optimizer. The focus of the short course will be on fundamental aspects of flow topology optimization such as boundary representations and the adjoint sensitivity analysis. The fundamentals will be presented using the problem of drag reduction for an object placed in a low Reynolds number flow. Attendees will be encouraged to experiment with other problems following the short course. Further, we will consider the mathematical formulation of the adjoint sensitivity analysis and possible alternatives for its solution. To conclude, we will briefly discuss current challenges in flow topology optimization.

EU Regional School - Schöps Seminar-Part 2

Location: AICES Seminar Room 115, 1st floor, Schinkelstr. 2, 52062 Aachen

Prof. Dr. Sebastian Schöps - Isogeometric Analysis with Application in Electrical Engineering

Graduate School CE, Technische Universität Darmstadt

Abstract

This lecture presents isogeometric analysis (IGA) in the context of electromagnetic simulations, [1]. IGA extends the set of polynomial basis functions, commonly employed by the classical Finite Element Method (FEM). While identical to FEM with Nedelec's basis functions in the lowest order case, it is generally based on B-spline and Non-Uniform Rational B-spline basis functions. The main benefit of this extension is the exact representation of the geometry in the language of computer aided design (CAD) tools. This simplifies the meshing as the computational mesh is implicitly created by the engineer using a CAD tool. 

The lecture starts with an introduction into electromagnetic field theory and the curl- and div-conforming spline function spaces are discussed. Finally, several interesting benchmark examples are shown which are for example used in optimisation and uncertainty quantification workflows. A hands-on session will demonstrate the free software geoPDEs which implements all necessary function spaces in a Matlab of GNU Octave environment.
 
[1] Zeger Bontinck, Jacopo Corno, Herbert De Gersem, Stefan Kurz, Andreas Pels, Sebastian Schöps, Felix Wolf, Carlo de Falco, Jürgen Dölz, Rafael Vázquez, and Ulrich Römer. “Recent Advances of Isogeometric Analysis in Computational Electromagnetics”. In: ICS Newsletter (International Compumag Society) 3 (Nov. 2017). URL: https://arxiv.org/abs/1709.06004.

 

EU Regional School - Schöps Seminar-Part 1

Location: AICES Seminar Room 115, 1st floor, Schinkelstr. 2, 52062 Aachen

Prof. Dr. Sebastian Schöps - Isogeometric Analysis with Application in Electrical Engineering

Graduate School CE, Technische Universität Darmstadt

Abstract

This lecture presents isogeometric analysis (IGA) in the context of electromagnetic simulations, [1]. IGA extends the set of polynomial basis functions, commonly employed by the classical Finite Element Method (FEM). While identical to FEM with Nedelec's basis functions in the lowest order case, it is generally based on B-spline and Non-Uniform Rational B-spline basis functions. The main benefit of this extension is the exact representation of the geometry in the language of computer aided design (CAD) tools. This simplifies the meshing as the computational mesh is implicitly created by the engineer using a CAD tool. 

The lecture starts with an introduction into electromagnetic field theory and the curl- and div-conforming spline function spaces are discussed. Finally, several interesting benchmark examples are shown which are for example used in optimisation and uncertainty quantification workflows. A hands-on session will demonstrate the free software geoPDEs which implements all necessary function spaces in a Matlab of GNU Octave environment.
 
[1] Zeger Bontinck, Jacopo Corno, Herbert De Gersem, Stefan Kurz, Andreas Pels, Sebastian Schöps, Felix Wolf, Carlo de Falco, Jürgen Dölz, Rafael Vázquez, and Ulrich Römer. “Recent Advances of Isogeometric Analysis in Computational Electromagnetics”. In: ICS Newsletter (International Compumag Society) 3 (Nov. 2017). URL: https://arxiv.org/abs/1709.06004.

 

I³MS - Göttsche Seminar

Location: AICES Seminar Room 115, 1st floor, Schinkelstr. 2, 52062 Aachen

Dr. Malte Göttsche - Reconstructing Past Fissile Material Production: An Inverse Problem

AICES Graduate School, RWTH Aachen University

Abstract

Uncertainties of current fissile material stockpiles usable in nuclear weapons are high. There is a significant research gap on methods to establish such inventories accurately. Closing this gap will be one requirement to enable nuclear disarmament. Inspectors will need to verify that no significant amounts of undeclared or unknown stocks exist. The most promising approach is to reconstruct the fissile material production history based on information available today. This inverse approach is called nuclear archaeology.

An analysis of provided records on past nuclear fuel cycle operations can be conducted using fuel cycle simulation tools. Such an approach should be complemented by integrating into the analysis information gained from measurements taken during inspections. Regarding plutonium production for example, neutron activation assessments of permanent reactor components in or near the core could be used to calculate the reactor’s neutron fluence, which is related to the amount of produced plutonium. Measurements of the volume/mass and isotopic concentration of radioactive waste can provide further information on reactor operations.

To make best use of the various sources of information, new models are needed that integrate all information into an overall fissile material assessment. Uncertainties must be determined adequately; the overall aim is to use the available information such that the uncertainty of the overall estimate is minimized.

Soft Skill Seminar with George Gopen, Ph.D.

Location: Hörsaalgebäude HKW "Toaster", Room HKW 5, 6th Floor, Wüllnerstraße 1, 52062 Aachen

George Gopen, Ph.D. - Scientific Writing from the Reader’s Perspective

Professor Emeritus of the Practice of Rhetoric, Duke University, USA

Abstract

For more than two centuries, English teachers have impressed upon their students that in order to become good writers, they must make two major efforts: (1) to adhere to the rules for the language that Society has established over time; and (2) to avoid the perceived evils of bad writing – too many words, too many hard words, and too much use of the passive.  These societal rules are badly misapplied to language for two main reasons: (1) Rules and language use do not mix well, there being so many exceptions to the rules that make for better writing; and (2) suppressing those alleged symptoms of bad writing fails to treat the causes of bad writing.      

 Dr. Gopen’s workshop, “Scientific Writing from the Reader’s Perspective,” offers a whole new approach to understanding how the English language functions.  It explains how readers actually go about doing the act of reading, of interpreting, of turning the words on the page into ideas in their heads.  It is intended to give you new eyes.  Once you understand how a reader reads, you will be empowered to arrange each of your sentences so that they will best control your readers in their interpretational acts. Knowing what your readers expect from the language and learning how to manipulate the reading process, will, in turn, take you back into your own thinking process, to discover what might have been left incomplete or contradictory or just not clear.  

This is a new way to thing about English.  It can change you permanently, giving you the upper hand over most of your competition for grant funding and for publication. You will never see the language the same way again.