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CE Seminar
Together with the Computational Engineering Research Center of the TU Darmstadt a joint seminar with interesting talks in the field of CE is organized in every semester. A list with forthcoming talks also may be found on the website of the CE Research Center.
Forthcoming Talks
2013-02-21
Unveiling some Mysteries of Application Performance on Multi-/Manycore Processors
Prof. Dr. Gerhard Wellein, Friedrich-Alexander-University Erlangen
The multicore trend has brought forth a variety of computer architectures suitable for numerical simulation. Nowadays there is no longer a single driving force for numerical performance. To make efficient use of the hardware the programmer must address multiple architectural features at the same time – otherwise he will face a performance ... [more] »
2013-03-21
Mathematische Bildverarbeitung mittels Compressed Sensing
Prof. Dr. Gitta Kutyniok, TU Berlin
Compressed Sensing is a novel research area, which was introduced in 2006, and since then has already become a key concept in various areas of applied mathematics. It predicts that high-dimensional signals, which allow a sparse representation by a suitable basis/frame, can be recovered from highly incomplete linear measurements by using efficient ... [more] »
2013-02-12
Simulation and Optimal Control of Time-Periodic PDE Problems
Prof. Dr. Ulrich Langer, Johannes Kepler University, Linz
This talk is provided together with the department of mathematics. [more] »
2013-04-19
Adaptive Discontinuous Galerkin Methods for nonlinear Diffusion-Convection- Reaction Models
Prof. Dr. Bülent Karasözen, Middle East Technical University, Ankara (Turkey)
Many engineering problems such as chemical reaction processes, population dynamics, ground water contamination are governed by coupled diffusion-convection-reaction partial differential equations (PDEs) with nonlinear source or sink terms. Nonlinear transport systems are typically convection and/or reaction dominated with characteristic solutions possessing ... [more] »
Previous Talks
2013-03-13
Particles – bridging the gap between solids and fluids
Prof. Dr. Peter Eberhard, University of Stuttgart
First, an overview about the research done at the institute will be given to set the framework why we are interested in the computationally so demanding particle methods. These methods have recently emerged as engineering tools that can be widely used in many different disciplines. Due to their meshless nature, they are especially well suited for problems ... [more] »
2013-04-08
Fast Solvers for Emerging Power Systems
Prof. Dr. Domenico Lahaye, TU Delft
National power grids are currently evolving from static entities, producing mainly a uni-directional flow from generation to loads, to more dynamic and decentralized structures. These emerging power systems should accommodate the local generation by renewable sources and peak demands of electrical vehicle charging. The cross-border interconnection of power ... [more] »
2012-12-17
Structural optimization of asymmetric brake rotors for the separation of their eigenfrequencies
Andreas Wagner, TU Darmstadt
Suppression of brake squeal has received a lot of attention by engineering researchers in the past. It is widely accepted in the scientific community that the self-excited vibrations induced by the frictional contact between brake disc and brake pad are the main cause of brake squeal. Presently, a variety of methods are being discussed to avoid squealing, ... [more] »
2012-11-19
Efficient method to model the fluid lag in fluid-driven crack simulations
Prof. Yongxing Shen, Universitat Politecnica de Catalunya, Barcelona
We study the fluid-structure interaction encountered in hydraulic fracturing, a technique used by the oil and gas industry. Simulating this process needs to take into account the interaction between a fracturing solid and the fluid flow in the crack. In particular, with the possible presence of a fluid lag, the evolving fluid front inside the crack and the ... [more] »
2012-11-09
Functional A Posteriori Error Estimates for Static Maxwell Type Problems
Prof. Dr. Dirk Pauly, University Duisburg-Essen
This talk is concerned with the derivation of computable and guaranteed upper and lower bounds of the di erence between the exact and the approximate solution of boundary value problems for static Maxwell type equations. Our analysis is based upon purely functional argumentation and does not attract speci c properties of an approximation method. Therefore, ... [more] »
2012-11-09
Nitsche-based finite element methods for the Stokes problem on cut and composite meshes – analysis, implementation and applications
Andre Massing, PhD, Simula Research Laboratory AS, Fornebu (Norway)
Multi-domain and multi-physics problems with moving interfaces and parameter studies with changing geometric domains can be severely limited by the use of conforming meshes when complex geometries in three spatial dimensions are involved. To overcome these limitations, several fixed-grid methods based on XFEM, Nitsche's method and related approaches have ... [more] »
2012-11-01
High-Quality Software Development in Academia: (Un-)Feasible?
Dr.-Ing. Klaus Iglberger, University Erlangen-Nürnberg
Software development in academia is subject to a set of special circumstances that make the development of sustainable, maintainable, and high-quality software particularly difficult. In this talk I address these problems, explain why academia might be facing substantials problems in years to come, but also why the creation of ... [more] »
2012-08-28
Uncertainty Quantification in Flow-Structures Interaction
Prof. Fernando A. Rochinha, Federal University of Rio de Janeiro, Brazil
Consistently replacing prototypes or physical experiments by computations has been pursued within the Engineering and Applied Science community in the last decades, to a large extent due to the impressive computer power available nowadays. But the use of computer simulations as an effective tool still faces conceptual and technical challenges. Chief among ... [more] »
2012-07-23
Fluid-Structure Interactions in Turbines
Prof. Romuald Rzadkowski, PhD, Polish Academy of Sciences, Gdańsk
A three-dimensional nonlinear time-marching method and numerical analysis for aeroelastic behaviour of oscillating blade row has been presented. The approach is based on the solution of the coupled fluid-structure problem in which the aerodynamic and structural equations are integrated simultaneously in time. Thus providing the correct formulation of ... [more] »
2012-08-06
preCICE - a multiphysics coupling environment for flexible coupling of black-box solvers
M.Sc. Bernhard Gatzhammer, TU München
2012-05-29
Productivity and Performance with Multi-Core Programming
Christian Terboven, Center for Computing and Communication, RWTH Aachen University
The multicore era has led to a renaissance for shared memory parallel programming models. Moreover, the introduction of Task-level parallelization raises the level of abstraction compared to thread-centric expression of parallelism. However, shared memory parallel applications may exhibit poor performance on NUMA systems if ... [more] »
2012-05-29
Recent Advances in PETSc Scalable Solvers
Dr. Lois Curfman McInnes, Argonne National Laboratory, U.S.A.
We will discuss recent advances in the Portable, Extensible Toolkit for Scientific computing (PETSc) that enable application scientists to develop composable linear, nonlinear, and timestepping solvers for multiphysics and multilevel methods on emerging extreme-scale architectures. Examples of usage include lithosphere dynamics, ... [more] »
2012-05-29
Autotuning: search, specialization, and multiple objectives
Dr. Paul Hovland, Argonne National Laboratory, U.S.A.
We describe recent and ongoing work in the area of automatic performance tuning. By employing specialization, we can develop tuned variants for the most common usage scenarios in a given application. By posing the empirical search problem as a mathematical optimization problem, we can draw upon the large body of research in derivative free optimization ... [more] »
2012-03-09
The GSI Green-IT Cube, a highly energy efficient data center
Prof. Dr. Volker Lindenstruth, Goethe-Universität, Frankfurt/Main
At GSI a new data center is being built, which sets new standards in energy efficiency and cost. The computer racks are cooled directly with heat exchangers and mounted on a steel structure much like a high rack warehouse. This architecture enables power densities exceeding 20 kW/m² and floor or 100 kW/m². The entire data center will support computers up to ... [more] »
2012-05-08
Substrate integrated waveguide integration with active components
Farzaneh Taringou, University of Victoria, Kanada
Substrate integrated waveguide (SIW) technology has been largely explored as a low-cost low-profile transmission line in passive microwave and millimeter circuits and devices. Yet,little research has been done to assess SIW performance in integration with active elements, e.g. Power Amplifier (PA) and Low Noise Amplifier (LNA). The ... [more] »
2012-01-19
Control of fluid flow using electromagnetic body forces
Dr. Thomas Albrecht, Forschungszentrum Dresden Rossendorf
In many engineering applications, the way natural fluid flows behave leaves some room for improvement. While geometric optimizations, such as streamlined shapes, require no additional energy input, they might not always be possible, feasible, or sufficient.
Another option is active flow control, where a suitable actuator more or less ... [more] »
2012-03-22
Design by Transformation - Application to Dense Linear Algebra Libraries
Prof. Dr. Robert van de Geijn, University of Texas at Austin, U.S.A.
The FLAME project has yielded modern alternatives to LAPACK and related efforts. An attractive feature of this work is the complete vertical integration of the entire software stack, starting with low level kernels that support the BLAS and finishing with a new distributed memory library, Elemental. In between are layers that target a single core, ... [more] »
2012-01-13
Some recent developments of a non-dissipative DGTD method for time-domain electromagnetics
Dr. Stéphane Lanteri, INRIA Sophia Antipolis-Méditerranée
Nowadays, a variety of modeling strategies exist for the computer simulation of electromagnetic wave propagation in the time domain. Despite a lot of advances on numerical methods able to deal accurately and in a flexible way with complex geometries through the use of unstructured (non-uniform) discretization meshes, the FDTD (Finite Difference Time Domain) ... [more] »
2012-01-20
Mechanoenzymatik: Atomistische Simulation biomolekularer Nanomaschinen
Prof. Dr. Helmut Grubmüller, Max-Planck-Institut für biophysikalische Chemie, Göttingen
Proteins are biological nanomachines. Virtually every function in the cell is carried out by proteins - ranging from protein synthesis, ATP synthesis, molecular binding and recognition, selective transport, sensor functions, mechanical stability, and many more. The combined interdisciplinary efforts of the past years have revealed how many of these ... [more] »
2011-10-12
Control of Conservation Laws using a Relaxation Approximation
Dr. Sonja Steffensen, RWTH Aachen
2011-10-09
Optimierung bei Partiellen Differentialgleichungen
Dr. Stephan Schmidt, Universität Trier
2011-10-14
PDE-constrained optimal control problems with pointwise inequality constraints
Dr. Ira Neitzel, TU Berlin
2011-10-07
Optimal control of Maxwell's equations and its applications
Dr. Irwin Yousept, TU Berlin
2011-10-07
A Numerical Algorithm for Advancing Slow Features in Fast-Slow Systems without Scale Separation - A Young Measure Approach
Prof. Edriss Titi, University of California, Irvine & The Weizmann Institute of Science
In the first part of the talk, and in order to set the stage, we will offer a multi-scale and averaging strategy to compute the solution of a singularly perturbed system when the fast dynamics oscillates rapidly; namely, the fast dynamics forms cycle-like limits which advance along with the slow dy- namics. We describe the limit as a Young measure with ... [more] »
2011-07-04
Analysis, Simulation und Mehrskalenansätze zur Feld/Netzwerk-Kopplung
Dr. Sebastian Schöps, Bergische Universität Wuppertal
Trotz zunehmend komplexer werdender elektromagnetischer Probleme machen heute neue Rechnerarchitekturen die numerische Simulation großer gekoppelter Probleme möglich. Die einzelnen Teilprobleme sind oft differential-algebraische Gleichungen, die aus der Ortsdiskretisierung partieller Differentialgleichungen (PDGLn) stammen. In diesem Vortrag werden ... [more] »
2011-07-01
Parametrische Modellordnungsreduktion für die Finite-Elemente-Approximation linearer zeitinvarianter Systeme
Dr.-Ing. Ortwin Farle, Universität des Saarlandes
Die Diskretisierung linearer zeitinvarianter Systeme mittels finiter Elemente (FE) führt auf große, dünnbesetzte lineare Gleichungssysteme, deren Dimension typischerweise in der Größenordnung von Hunderttausend bis einigen Millionen liegt. Während ihre Lösung für eine einzelne Frequenz beim heutigen Stand der Technik kein Problem mehr bereitet, stellt die ... [more] »
2010-11-10
Modelling and Simulation of Electrostimulating Implants in Bio-systems
Prof. Dr. Ursula van Rienen, Universität Rostock
2011-06-14
Computational Methods for the Maxwell Eigenvalue Problem at Optical Frequencies
Dr.-Ing. Bastian Bandlow, Universität Paderborn
This talk is about the advancement of grid-based simulation algorithms for modelling electromagnetic wave propagation in photonics. For this purpose, existing algorithms for problems arising from the microwave range are extended for the analysis and the design of linear passive nanostructures at optical frequencies. The focus is put on the calculation of ... [more] »
2011-06-14
Design und Optimierung der Dämpfungsmaßnahmen für strahlinduzierte Felder der CERN-SPL Studie
Dr.-Ing. Carsten Potratz, Universität Rostock
Elektromagnetische Felder, die durch die zu beschleunigenden Ladungsträger im Teilchenbeschleuniger hinterlassen werden, stellen eine wesentliche Limitierung für im Bau befindliche und zukünftige Teilbeschleunigerprojekte dar. Zur Dämpfung dieser als Wakefelder bezeichneten elektromagnetischen Felder werden spezielle Kopplerstrukturen eingesetzt, die den ... [more] »
2011-05-26
From Analytical to Numerical Methods and Back: Trefftz Schemes, Whitney Forms, and Optical Magnets
Prof. Dr. Igor Tsukerman, University of Akron, USA
Several examples of a curious interplay between analytical and numerical methods will be presented. First, accurate local (semi-)analytical Trefftz approximations lead to high-order difference schemes and to singularity-free boundary-difference methods. Second, Whitney-like interpolation, well established in finite element analysis, is now put to a new use ... [more] »
2010-12-17
Isogeometric Finite Elements
Prof. Dr. Bernd Simeon, TU Kaiserslautern
This talk will discuss the recently introduced class of isogeometric finite elements, which generalize the isoparametric concept to B-splines and NURBS (Non-Uniform Rational B-Splines). The latter are one of the standard descriptions for free form surfaces and various typical engineering shapes in Computer Aided Design (CAD) software. Besides explaining the ... [more] »
2011-04-18
Influence of walls on transport and mixing in two-dimensional turbulence
Dr. Benjamin Kadoch, Laboratoire de Mécanique, Modélisation & Procédés Propres, M2P2-CNRS, Aix–Marseille Université and École Centrale Marseille, France
The influence of walls on the Lagrangian transport and mixing of passive scalars in turbulent two-dimensional flows is investigated. Two distinct geometries are considered by means of direct numerical simulation: a biperiodic domain and a circular domain with no-slip boundary conditions for velocity and zero flux for the scalar. A penalization method allows ... [more] »
2010-11-29
Modeling of Flows with Interfaces
Prof. Dr.-Ing. Nikolaus Adams, TU München
Flows with interfaces exhibit interactions on a large range of scales, resulting in large demands on compute power for simulations. Single-phase flows already can exhibit a large range of strongly coupled scales whose efficient computational modeling poses a challenge by itself. Immersed interfaces add small-scale transport phenomena and can dominate the ... [more] »
2010-09-30
Theory and numerical simulations of wave generation in atomization using the volume of fluid method
Prof. Stéphane Zaleski, Université Pierre et Marie Curie, Paris
We describe computations performed using the Gerris code, an open-source software implementing finite volume solvers on an octree adaptive grid together with a piecewise linear volume of fluid interface tracking method. The parallelisation of Gerris is achieved by domain decomposition into a large number of grains (a "forest of tree" approach) ... [more] »
2010-11-04
Direkte Simulation von kompressiblen Mehrphasenströmungen
Dr. Felix Jägle, Universität Stuttgart
2011-01-13
Parameteridentifikation und optimale Steuerung bei partiellen Differentialgleichungen
Prof. Dr. Arnd Rösch, Universität Duisburg
Bei der Lösung von Optimierungsaufgaben bei partiellen Differentialgleichungen und von Parameteridentifikationsaufgaben werden häufig sehr ähnlich mathematische Probleme untersucht. Dabei haben die mathematischen Gebiete Inverse Probleme und Optimale Steuerung sehr unterschiedliche Herangehensweisen. Ausgehend von der Korrektheitsdefinition von Hadamard ... [more] »
2011-01-13
Konvergenz und Optimalität adaptiver Finite Elemente Verfahren
Prof. Dr. Kunibert Siebert, Universität Duisburg
Adaptive Finite Elemente Verfahren werden seit den 1970er Jahren erfolgreich zur effizienten numerischen Lösung partieller Differenzialgleichungen verwendet. Das übliche adaptive Verfahren ist eine Iteration der Form SOLVE → ESTIMATE → MARK → REFINE. Die meisten Arbeiten zu adaptiven Finiten Elementen befassen sich mit dem Modul ESTIMATE, ... [more] »
2010-12-01
Optimal control of Maxwell's equations with regularized state constraints
Dr. Irwin Yousept, TU Berlin
In this talk, we consider a state--constrained optimal control problem of Maxwell's equations based on a 'vector potential ansatz' for the control. The pointwise state constraints here play an important role to prevent singularities or to achieve certain $L^p$--regularity of the optimal state. Due to the lack of regularity of the control--to--state ... [more] »
2010-11-26
Resource Allocation in Wireless Networks: From Interference Management to Broadcast Property Exploitation
PD Dr.-Ing. Slawomir Stanczak, Fraunhofer Lab for Mobile Communications (FhG-MCI)
2010-10-06
Robots and the Human
Prof. Oussama Khatib, Artificial Intelligence Laboratory, Stanford University
Robotics is rapidly expanding into the human environment and vigorously staying engaged in its emerging challenges. From a largely dominant industrial focus, robotics has undergone, by the turn of the new millennium, a major transformation in scope and dimensions. This expansion has been brought about by the maturity of the field and the advances in its ... [more] »
2010-11-03
Multicomponent AM-FM Modelling of Nonstationary Signals
Prof. Francesco Gianfelici, Aalborg University, Denmark
Multicomponent AM-FM models, also known as McAulay-Quatieri models in audio and speech processing, are highly parametric representations of non stationary signals that are able to effectively represent a large class of real phenomena with no limitations in terms of signal kind, applicative domain, and so on. During recent decades, the elegant formulation of ... [more] »
2010-09-28
A Signal Processing Approach to the Analysis and Modeling of Driving Behavior
Prof. Kazuya Takeda, Graduate school of information science, Nagoya University
Since 2004, the driving behavior of more than five hundred drivers has been collected while subjects drove in real traffic, by researchers at Nagoya University in Japan. The main purpose of this data collection is to build corpora (large bodies of representative data) for a new research challenge - human behavior signal processing. Environmental and ... [more] »
2010-04-29
The inverse elastostatic problem
Dr. Mathieu Sellier, University of Canterbury, New Zealand
2010-04-29
Multigrid techniques for thin liquid films and droplets
Dr. Mathieu Sellier, University of Canterbury, New Zealand
This talk is provided together with the Center of Smart Interfaces (CSI). [more] »
2010-07-22
Advanced Modeling Techniques for 3D Electronic Package Signal Integrity and Power Integrity
Prof. ErPing Li, Institute of High Performance Computing A*STAR, Singapore
Driven by the impressive growth of the communication industry, we see a rapid convergence of digital computing and analog wireless technology. This has become possible due to the progress of, semiconductor technology into the nanometer regime which is going to continue for the next ten to fifteen years. High-level integration with unprecedented ... [more] »
2010-06-30
Structural optimization - Towards a multiscale approach
Prof. Dr. Michael Stingl, Universität Erlangen-Nürnberg
2010-06-11
Adaptive higher-order finite element methods for multiphysics coupled problems
Prof. Dr. Pavel Solin, University of Nevada, Reno/ Institute of Thermomechanics, Prague
In this presentation I will briefly introduce my research group and its goals. I will explain why we are interested in adaptive finite element methods based on computational, as opposed to mathematical/analytical error estimates. Main principles of adaptive higher-order finite elementi methods (hp-FEM) will be explained and demonstrated via live ... [more] »
2010-04-28
Stochastic Polynomial Approximations for Partial Diff erential Equations with Random Input Data
Prof. Dr. Fabio Nobile, Politecnico di Milano
When building a mathematical model to describe the behavior of a physical system, one has often to face a certain level of uncertainty in the proper characterization of the model parameters and input data. An example is given by the study of groundwater flow, where the subsurface permeability is largely unknown and often reconstructed from few available ... [more] »
2010-05-06
Towards Robust Visual Pattern Recognition: from Emotion Recognition to Human Activity Monitoring
Prof. Dr. Salim Bouzerdoum, University of Wollongong, Australia
One of the challenges of visual pattern recognition is robustness to photometric and geometric distortions that occur in uncontrolled natural environments. To this end, we have proposed recently a new paradigm for visual pattern recognition which combines feature extraction and classification in one hierarchical image classification architecture. The ... [more] »
2010-03-24
Non-traditional Finite Difference and Boundary Difference Methods
Prof. Dr. Igor Tsukerman, University of Akron, USA
Traditional finite-difference methods are typically based on Taylor expansions of the differential operator. The generalized finite-difference calculus of Flexible Local Approximation MEthods (FLAME) often dramatically improves the accuracy by replacing these Taylor expansions with Trefftz functions – local solutions of the underlying differential ... [more] »
2010-04-21
Design Principles of Wind Turbine Blades
Prof. Alois Schaffarczyk, FH Kiel
This talk is provided together with the Center of Smart Interfaces (CSI). [more] »
2010-05-05
Information Theory meets Biology
Prof. Martin Bossert, University Ulm
Es wird eine kurze Übersicht über die DFG-Projekte im DFG Schwerpunktprogramm SPP 1395 (InKoMBio) gegeben. Nach einer kurzen Einführung in die elementaren informationstheoretischen Begriffe wird auf die Analyse binärer polynomialer Systeme mittels der Fourier Analyse eingegangen. (Vorstellung des DFG-Projektes: Die Evolutive Anpassung der transkriptionellen ... [more] »
2010-04-22
Impulsbasierte Dynamiksimulation
Prof. Jan Bender, TU Darmstadt
Die dynamische Simulation ist ein aktueller Forschungsbereich mit vielen Anwendungsgebieten. Dieser Bereich umfasst u.a. die Simulation von Starrkörpern, Textilien und Weichkörpern. Dynamische Simulation ist heutzutage ein wichtiger Bestandteil im Entwicklungsprozess von komplexen Maschinen (wie z.B. in der Robotik), im Forschungsbereich der Medizin, in der ... [more] »
2010-04-12
Variationelle Mehrskalen-Methoden für turbulente Strömungen und Verbrennung
Dr.-Ing. Volker Gravemeier, TU München
Die variationelle Mehrskalen-Methode wurde vor ca. 15 Jahren zum ersten Mal der Fachwelt als theoretisches Rahmenwerk für die Entwicklung numerischer Methoden für Probleme mit sehr breiten Skalenspektren vorgestellt. Als Beispiele für solche Mehrskalen-Probleme kann man u.a. viele Problemstellungen der Materialmodellierung, aber auch z.B. turbulente ... [more] »
2010-01-21
Numerische Feldberechnung in der Anwendung bei Fragestellungen Elektrischer Maschinen
Prof. Dr.-Ing. habil. Dr. h.c. Kay Hameyer, RWTH-Aachen
2010-04-12
Das Internet der Dinge - eine Bestandsaufnahme
Dr.-Ing. Heinrich Stüttgen, NEC Laboratories Europe
2010-04-15
Examples of Adaptive Filtering in Hearing Aids: Beamforming and Feedback Cancellation
Dr.-Ing. Henning Puder, Siemens Audiologische Technik, Erlangen
2010-04-15
Mensch-Maschine-Interaktion in der industriellen Informationsverarbeitungskette
Dr. Rainer Heiß, HA-WI Kunststoffe, Bad Laasphe
2010-02-03
Measure, Lebesgue Integration, The Dirac Delta, Lebesgue-Stieltjes Integration and Cramer’s Representation
Dr. Roy Howard, Curtin University, Perth, Australia
Part 1: Singularity type functions, such as the Dirac delta, are usually defined assuming that they operate on well defined functions - usually called ‘good functions’. The results that hold for singular- ity functions, and for the good function case, do not hold, in general, for the usual case where non- good functions are to be considered and this has led ... [more] »
2010-01-25
Strömungsablösung in laminar-welligen Rieselfilmen
Dipl.-Ing. Georg Dietze, RWTH Aachen
Rieselfilme (d.h. dünne durch Gravitation getriebene flüssige Filme) spielen in einer Vielzahl technischer Prozesse in der Energie- und Verfahrenstechnik eine Rolle. In Kühltürmen wird z.B. Wasser auf sogenannte Rieseleinbauten gesprüht, wodurch sich ein verdunstender Film ausbildet. Rieselfilme aus flüssigem Lithium werden in der Kernfusionsforschung zur ... [more] »
2010-01-13
Initial Value Problem Formulation of Time Domain BEM and Application to Wake Field Analysis
Prof. Hideki Kawaguchi, Muroran Institute of Technology, Muroran, Japan
Although Boundary Element Method (BEM) requires us heavy calculation cost and large required memory, it givs us some remarkable advantages due to property of surface mesh such as in open bounary problems, moving boundary problems, optimized shape design problems, inverse problems, coupling problems with moving charged particles, and so on. This means that ... [more] »
2009-12-11
Transient Electromagnetic Field Coupling with an Airborne Vehicle in the Presence of its Conducting Exhaust Plume
Dr. Sisir Kumar Nayak, Royal Institute of Technology, Stockholm
Airborne vehicle or and its payload are extremely expensive and their loss as a result of a nearby lightning strike is highly undesirable. Even though one could launch only under ideal weather conditions, the cost involved with long launch delays could be very high. So in this age of all weather usage of airborne launch vehicles, it has become necessary to ... [more] »
2009-11-17
Monaural and binaural beamforming for hearing aids
Dr.-Ing. Henning Puder, Siemens Audiologische Technik
Hearing impaired people suffer from significant problems of understanding speech in noisy environments. The damage of the outer hair cells in the cochlear causes a reduced frequency resolution or higher frequency masking of the auditory perception, respectively. The only possibility to compensate for this effect is to offer people a signal with reduced ... [more] »
2009-10-16
Turbulence transition in shear flows: What can we learn from pipe flow?
Prof. Dr. Bruno Eckhardt, Philipps-Universität Marburg
According to textbook wisdom, flow down a pipe becomes turbulent near a Reynolds number of about 2000. This simple statement misses many subtleties of the transition: the absence of a linear stability of the laminar flow, the sensitive dependence on perturbations that sometimes succed and sometimes fail to induce turbulence and the unexpected observation ... [more] »
2009-08-20
Cognition: The Enabler of New Generation of Engineering Systems
Prof. Dr. Simon Haykin, McMaster University, Hamilton, Canada
When we speak of cognition, we usually think of the human brain: A powerful and highly complex information-processing system. So, I set the stage for my lecture by describing the Action-Perception Cycle that is an inherent characteristic of the brain. With the Action-Perception Cycle as the focus of attention throughout the lecture, I will then describe ... [more] »
2009-09-07
Mapping and Exploration for Search and Rescue with Humans and Mobile Robots
Dr. Alexander Kleiner, Albert-Ludwigs-Universität Freiburg
Urban Search And Rescue (USAR) is a time critical task since survivors have to be rescued within the first "golden" 72 hours. One goal in Rescue Robotics is to support emergency response by mixed-initiative teams consisting of humans and robots. Their task is to explore the disaster area rapidly while reporting victim locations and hazardous areas ... [more] »
2009-09-07
Extrahieren verborgener Strukturen aus Daten mit latenten Variablen
Dr. Roland Memisevic, University of Toronto, Canada
Latente Variablen haben eine langjährige Geschichte in der Modellierung komplexer statistischer Zusammenhänge. Indem sie versteckte Strukturen in Daten selbständig aufgreifen und repräsentieren können, ermöglichen sie es, erstaunlich elegante und einfache Modelle einer Vielzahl komplexer Phänomene zu generieren. Klassische Beispiele für Verfahren, die auf ... [more] »
2009-06-24
Scientific Computing on Multi-GPU Systems
Dr. Robert Strzodka, MPI Saarbruecken
The advances in hardware functionality and programmability of graphics processors (GPUs) have greatly increased their appeal as add-on co-processors for scientific computing. However, for large-scale computations a desktop with a single GPU is not sufficient and parallel workstations or even clusters with multiple GPUs must be considered. This talk will ... [more] »
2009-06-10
Interactive Texture-based Flow Visualization
Prof. Charles Hansen, SCI Institute, University of Utah
Flow fields play an important role in a wide range of scientific, engineering, and medical disciplines. Due to the advancements in computing technologies and computational fluid dynamics (CFD), recently we have seen a large number of flow datasets with ever increasing size and complexity from numerical fluid simulations. In order to obtain valuable ... [more] »
2009-05-28
Simulation der Notwasserung von Verkehrsflugzeugen
Prof. Dr.-Ing. Thomas Rung, TU Hamburg-Harburg
Am 15. Januar 2009 gelang dem Piloten einer Maschine vom Typ A320 der US Airways nach dem Ausfall beider Triebwerke eine Notwasserung auf dem Hudson River in New York. Alle 155 Insassen überstanden die Notwasserung nahezu unverletzt. Der Vortrag behandelt einen randständigen Bereich des Flugzeugbaus, der sich mit der Notwasserung und Schwimmfähigkeit von ... [more] »
2009-05-11
Model predictive control of flows
Prof. Dr. Michael Hinze, University of Hamburg
We exploit ideas from model predictive control to construct nonlinear distributed and boundary controllers for flow governed by the instationary Navier Stokes equations or the Boussinesq approximation. We numerically test the performance of the controllers considering as example control of the wake of the circular cylinder in the laminar flow regime, and ... [more] »
2009-06-08
Excitation-Adaptive FDTD Scheme Design by the Method of Undetermined Coefficients for Specified Spectral Orders of Accuracy
Bezalel Finkelstein, Tel-Aviv University
2009-05-26
Some recent results in cooperative wireless relaying
Prof. Dr. Armin Wittneben, Swiss Federal Institute of Technology (ETH), Zurich
Existing wireless networks are designed for coexistance, i.e. essentially for interference avoidance. In contrast cooperative wireless communication intentionally accepts interference to optimize network performance. In this talk we start out with a brief introduction to cooperative wireless communication and in particular wireless relaying. Subsequently ... [more] »
2009-05-14
Implicit LES: Theory and Application
Prof. Dr.-Ing. Nikolaus A. Adams, Technische Universität München
A systematic framework for implicit LES modeling will be presented. Unlike previous approaches to ILES, where given nonlinearly stable discretizations are employed without a priori analysis of the effect of the truncation error, with the proposed framework ALDM (adaptive local deconvolution model) physically consistent modeling is introduced to ILES. With ... [more] »
2009-04-28
Beiträge zu Spektral-Elemente-Methoden und Anwendungen in der Strömungsmechanik
Dr.-Ing. habil. Jörg Stiller, Technische Universität Dresden
Spektralelementmethoden (SEM) kombinieren die Genauigkeit von Spektralmethoden mit der Flexibilität von Finite-Elemente-Verfahren. Dieser Anspruch lässt sich In der Praxis nicht immer leicht verwirklichen.
Dieser Vortrag startet mit einigen Erfolgsbeispielen aus dem SFB 609 an der TU Dresden.
Der zweite Teil widmet sich der implementierung von ... [more] »
2009-03-06
A Hybrid Optimization Scheme Combining Pattern Search and Gaussian Process
Genetha Gray, PhD, Sandia National Laboratories, Livermore
Every optimization technique has inherent strengths and weaknesses. Moreover, some optimization algorithms contain characteristics which make them better suited to solve particular kinds of problems. Hybridization, or the combining of two or more complementary, but distinct methods, allows the user to take advantage of the beneficial elements of multiple ... [more] »
2009-03-24
On the Manifold-Mapping Technique for Optimization Problems with Partial Differential Equation Constraints
Prof. Dr. Domenico Lahaye, TU Delft
Optimization problems with partial differential equations constraints are computationally challenging problems that appear in a wide range of engineering applications. Space-mapping techniques allow to speed their solution procedure by extracting information from approximate models such as for instance analytical and lumped parameter approximations. Early ... [more] »
2009-03-30
Numerical Investigations for an Extension of FDTD on Tetrahedral Grids
Prof. Lorenzo Codecasa, Ph.D., Politecnico di Milano
The Finite Difference Time Domain (FD-TD) algorithm, originally proposed by K. S. Yee, is one of the most common algorithm for the time-domain simulation of electromagnetic problems. This is essentially due to the fact that the FD-TD algorithm is explicit, so that its computationally complexity and memory requirement are low, and to the fact that the limit ... [more] »
2009-03-02
Computability and Computational Complexity of/in Physical Theories
Dr. Martin Ziegler, TU Wien
We combine the classical theories of discrete computation (Turing computability and complexity classes like NP) and real number computation (Recursive Analysis and BSS model) with Theoretical Physics in order to
1. investigate physical foundations of computing (Church-Turing Hypothesis) and
2. devise a complexity theory of computer simulation ... [more] »
2009-02-05
Understanding anisotropic mesh adaptation from the perspective of uniform meshes in a metric space: Theory and applications
Prof. Dr. Weizhang Huang, University of Kansas
Anisotropic mesh adaptation has proven to be a useful tool for enhancing accuracy and efficacy in the numerical solution of partial differential equations, especially those exhibiting anisotropic features in their solutions and/or structures. On the other hand, the mathematical characterization of anisotropic meshes has not been well understood. In ... [more] »
2008-11-07
Simulation of microelectronic structures using potentialfieldsolving and optimal parameter setting methods
Wim Schoenmaker, CTO, MAGWEL N.V., Leuven (B)
The simulation of electromagnetic phenomena using field solvers for semiconductor structures demands the use of potentials and vector potentials because the local energy, more than the local force, determines the electron and hole distributions. The ideas underlying the finiteintegration method are applied to the potential fields leading to a discretization ... [more] »
2008-10-27
Time Domain Electromagnetic Algorithms and Their Application to Photonics
Prof. Trevor Benson, University of Nottingham
Electromagnetic modelling for photonics shares many common problems with other applications. These include the requirement for: multi-scale modelling, requiring an accurate description of small features that can have significant influence on the performance of a significantly larger system; addressing multi-physics problems operating on timescales; highly ... [more] »
2008-12-19
Discontinuous-Galerkin-Verfahren für instationäre Wellen- und Diffusionsprobleme
Prof. Claus-Dieter Munz, Universität Stuttgart
Der Vortrag gibt eine Übersicht über die Entwicklung von Discontinuous-Galerkin-Verfahren für instationäre Probleme. Durch ihre Flexibilität und die Qualität der Näherungslösungen werden diese Verfahren als eine künftige Möglichkeit gesehen, numerische Simulationen in komplexen Geometrien effizienter zu machen. Das DG-Verfahren kann als eine Kombination von ... [more] »
2008-11-14
Parallel Computing with CUDA
Prof. Dr. Michael Goesele, TU Darmstadt
Modern graphics cards are not only powerful rendering systems but can also be used as massively parallel compute devices. Applications that are well suited for the cards' SIMD architecture can achieve speed ups of more than two orders of magnitude compared to single CPU implementations. In this talk, I will give an introduction to NVIDIA's CUDA ... [more] »
2008-12-10
A Research On Natural Convection Under A Magnetic Field: Numerical Simulation And The Construction Of A Reduced Dynamical Model
Dr. Ersan Güray, Middle East Technical University, Ankara
2008-11-05
Fast and Accurate Solutions of Very Large Electromagnetics Problems with the Parallel Multilevel Fast Multipole Algorithm
Özgür Ergül, Ph.D. Candidate, Bilkent University, Ankara
The multilevel fast multipole algorithm (MLFMA) is a powerful method for the fast and efficient solution of scattering and radiation problems in electromagnetics. Real-life problems formulated with surface integral equations can be solved iteratively, where the required matrix-vector multiplications are performed efficiently by MLFMA. However, many ... [more] »
2008-10-27
Modellierung von Messfehlern mit stochastischen partiellen Differentialgleichungen
Prof. Dr. Wilhelm Stannat, TU Darmstadt
2008-10-27
Simulation stochastischer partieller Differentialgleichungen
Prof. Dr. Klaus Ritter, TU Darmstadt
2008-10-07
Theoretische Elektrotechnik in Bewegung: Dynamische Simulation elektromechanischer Systeme
Prof. Dr.-Ing. Stefan Kurz, Frankfurt
Elektromechanische Systeme werden durch die Maxwellschen Gleichungen in Verbindung mit der Newtonschen Bewegungsgleichung beschrieben. Die physikalischen Gesetze liegen dabei in Form (partieller) Differentialgleichungen vor, die durch Anwendung numerischer Verfahren schrittweise in lineare Gleichungssysteme überführt und auf dem Rechner gelöst werden. ... [more] »
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