Adjoint Sensitivity computaion for the Parallel Multigrid Reduction in Time Software Library XBraid

Event Sponsor: 
Mathematics and Computer Science Division LANS Seminar
Start Date: 
Nov 16 2016 - 3:00pm
Building/Room: 
Building 240/Room 4301
Location: 
Argonne National Laboratory
Speaker(s): 
Stefanie Günther
Speaker(s) Title: 
Technische Universitat Kaiserslautern
Host: 
Sri Hari Krishna Narayanan

In this talk, I will present the development of an adjoint solver for the multigrid in time software library XBraid. XBraid provides a non-intrusive approach for simulating unsteady dynamics on multiple processors while parallelizing not only in space but also in the time domain. It applies an iterative multigrid reduction in time algorithm to existing spatially parallel time propagators and computes the unsteady solution parallel in time. We develop a non-intrusive adjoint solver for XBraid that enhances the primal iterations by an iteration for computing adjoint sensitivities parallel in time. Due to the iterative nature of the primal and the adjoint flow computation, the method is very well suited for simultaneous optimization algorithms like the One-shot method which solve the optimization problem in the full space.

Information: Bio: After her studies of mathematics with minor subject computer science at University of Trier, she is now a research assistant in the Scientific Computing group of Prof. Gauger at TU Kaiserslautern and a PhD student at RWTH Aachen University. Furthermore, she is an associated fellow at the Aachen Institute of Advanced Study in Computational Engineering Science (AICES) and an active member of the SIAM Student Chapter Aachen.

Miscellaneous Information: 

Refreshments will be served.

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