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DTSTART;TZID=Europe/Paris:20170427T140000
DTEND;TZID=Europe/Paris:20170427T160000
DTSTAMP:20170426T072513Z
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UID:1002-1493301600-1493308800@bioqic.de
SUMMARY:Time-domain waveform modeling and inversion from millimeters to the Globe
DESCRIPTION:Time-domain waveform modeling and inversion from millimeters to the Globe \nBy Christian Böhm of ETH \nAbstract: Waveform inversion has become a powerful tool for parameter estimation in many exciting domains such as seismic tomography\, medical imaging\, and non-destructive testing. Despite the vastly different scales\, all these applications have in common that they can be stated as a PDE-constrained optimization problem governed by some variant of the time-dependent wave equation that invert for unknown material properties or external forces.\nIn this talk we present Salvus\, an HPC software package designed to solve large-scale full-waveform inverse problems\, with a focus on both flexibility and performance. Salvus is a collection of packages covering the complete toolchain of waveform inversion\, ranging from creating unstructured meshes in two and three dimensions to an automated\, interactive and graph-based workflow management framework capable of orchestrating all necessary components. The wave equation solver is based on a high-order spectral-element discretization and supports a diverse collection of wave propagation physics\, such as viscoelasticity or solid-fluid coupling. Adjoint-based computations of gradients and Hessian-vector products as well as custom-tailored compression methods are built-in\, which allows a tight integration with optimization methods to solve the inverse problem.\nSalvus bridges the gap between research and production codes with a design based on C++ template mixins and Python wrappers that separate the physical equations from the numerical core. It was constructed by following modern software design practices\, testing protocols\, and by establishing its foundations upon existing high-level scientific libraries\, such as PETSc and Eigen.\nThe goal of this presentation is to introduce the code and its underlying mathematical framework. Furthermore\, we show several numerical examples across the scales.\n \nOrganizer:\nMartin Hammerschmidt\, Zuse-Institut Berlin (ZIB)\nBereich Numerische Mathematik\nAbteilung Numerische Analysis und Modellierung\nTakustr. 7\, D-14195 Berlin-Dahlem
URL:https://bioqic.de/event/time-domain-waveform-modeling-and-inversion-from-millimeters-to-the-globe/
LOCATION:ZIB Berlin-Dahlem\, Takustr. 7\, Berlin-Dahlem\, 14195\, Germany
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DTSTART;TZID=Europe/Paris:20170405T170000
DTEND;TZID=Europe/Paris:20170405T203000
DTSTAMP:20170425T141237Z
CREATED:20170425T141001Z
LAST-MODIFIED:20170425T141237Z
UID:1000-1491411600-1491424200@bioqic.de
SUMMARY:1st BIOQIC introduction seminar
DESCRIPTION:1st BIOQIC introduction seminar + pizza dinner
URL:https://bioqic.de/event/1st-bioqic-introduction-seminar/
LOCATION:Charite Campus Mitte\, Chariteplatz 1\, Berlin\, Deutschland
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