Date and Place: Thursdays and hybrid (live in 32-349/online via Zoom). For detailed dates see below!
Content
In the Scientific Computing Seminar we host talks of guests and members of the SciComp team as well as students of mathematics, computer science and engineering. Everybody interested in the topics is welcome.
List of Talks
Event Information:
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Thu02Feb2017
SC Seminar: Stefanie Günther
11:30SC Seminar Room 32-349
Title:
Parallel-in-Time Optimization with Unsteady PDEsAbstract:
A simultaneous optimization framework for unsteady PDEs using the parallel-in-time software library XBraid is presented. XBraid provides a non-intrusive approach for parallelization in the time domain by applying an iterative multigrid reduction in time algorithm to existing sequential time-stepping codes. We develop a non-intrusive adjoint solver for XBraid that enhances these primal iterations by an iteration for computing adjoint sensitivities parallel in time. The adjoint sensitivities are then used in a simultaneous optimization method, namely the One-shot method which solves the optimization problem in the full space. We validate the time-parallel simultaneous optimization approach by applying it to an inverse design problem with unsteady PDEs that mimics the behavior of separated flows past bluff bodies.