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LANS Informal Seminar: Stefanie Günther
November 16, 2016 @ 15:00 CST
Seminar Title: Adjoint Sensitivity computaion for the Parallel Multigrid Reduction in Time Software Library XBraid
Speaker: Stefanie Günther, Chair for Scientific Computing Technische Universitat Kaiserslautern
Date/Time: 2016-11-16 15:00
Location: Bldg. 240, room 4301
Description:
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.