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DTSTART;TZID=Europe/Berlin:20170419T160000
DTEND;TZID=Europe/Berlin:20170419T180000
DTSTAMP:20170405T080536Z
CREATED:20170120T093648Z
LAST-MODIFIED:20170405T080536Z
UID:1001-1492617600-1492624800@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Dr. Marta D'Elia
DESCRIPTION:On Wednesday\, April 19\, 2017\,  Dr. Marta D’Elia from the Computer Science Research Institute at Sandia National Laboratories will join the ALOP-Colloquium and present her recent work entitled  \nA coupling strategy for nonlocal and local models with applications to static peridynamics and classical elasticity \nABSTRACT: The use of nonlocal models in science and engineering applications has been steadily increasing over the past decade. The ability of nonlocal theories to accurately capture effects that are difficult or impossible to represent by local Partial Differential Equation (PDE) models motivates and drives the interest in this type of simulations. However\, the improved accuracy of nonlocal models comes at the price of a significant increase in computational costs compared to\, e.g.\, traditional PDEs. In particular\, a complete nonlocal simulation remains computationally untenable for many science and engineering applications. As a result\, it is important to develop local-to-nonlocal coupling strategies\, which aim to combine the accuracy of nonlocal models with the computational efficiency of PDEs. The basic idea is to use the more efficient PDE model everywhere except in those parts of the domain that require the improved accuracy of the nonlocal model.  We develop and analyze an optimization-based method for the coupling of nonlocal and local problems in the context of nonlocal elasticity. The approach formulates the coupling as a control problem where the states are the solutions of the nonlocal and local equations\, the objective is to minimize their mismatch on the overlap of the nonlocal and local domains\, and the controls are virtual volume constraints and boundary conditions. We prove that the resulting optimization problem is well-posed and discuss its implementation using Sandia’s agile software components toolkit.  Numerical results for nonlocal diffusion in three-dimensions illustrate key properties of the optimization-based coupling method; these numerical tests provide the groundwork for the development of efficient and effective engineering analysis tools. As an application\, we present results for the coupling of static peridynamics and classical elasticity. \nThe presentation will take place in HS 8. \nPlease join us for coffee in E10 at 15:45
URL:https://alop.uni-trier.de/event/alop-colloquium-with-marta-delia/
LOCATION:Trier University\, E Building\, Universitätsring 15\, Trier\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
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DTSTART;TZID=Europe/Berlin:20170424T160000
DTEND;TZID=Europe/Berlin:20170424T180000
DTSTAMP:20170405T080437Z
CREATED:20170327T121707Z
LAST-MODIFIED:20170405T080437Z
UID:1120-1493049600-1493056800@alop.uni-trier.de
SUMMARY:ALOP Colloquium with Prof. Florian Jarre
DESCRIPTION:On Monday\, April 24\, 2017\,  Prof. Florian Jarre from the Heinrich Heine Universität Düsseldorf will join the ALOP-Colloquium and present his recent work “The Max-Cut-Polytop” \nAbstractThe max-cut-polytope arises from a simple reformulation of the problem of finding the maximum cut in a graph with given edge weights. Unfortunately\, the exact pre-presentation of the cut polytope is not tractable unless NP = Co-NP.We discuss two different representations and inner and outer nonlinear approximations of the max-cut polytope leading to the anticipation that solving the max-cut-problem should be easy. (It is not!)This talk is not about a paper but rather about some open questions and possible topics of – rather difficult – future research. \nThe presentation will take place in HS 9. \nPlease join us for coffee in E10 at 15:45
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-florian-jarre-universitat-dusseldorf/
LOCATION:Trier University E Building\, Universitätsring 15\, Trier\, 54296\, Germany
CATEGORIES:Colloquium
ORGANIZER;CN="Research Training Group ALOP at Trier University":MAILTO:OptimizationDays@uni-trier.de
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