Talk on May 29, 2013

 

Wednesday, May 29, 2013 12:30 pm

Output-based adaptive methods for steady and unsteady aerodynamics

Prof. Krzysztof J. Fidkowski (Arizona State University, USA)

Abstract:
This talk presents recent advances in output-based solution strategies
for steady and unsteady aerodynamics, using a discontinuous Galerkin
finite element method.  The simulations are adaptive in space and
time, and the adaptation is driven by the solution of a discrete
adjoint problem specific to a chosen scalar output.  The
adjoint-weighted residual yields an error estimate that corrects the
output for effects of numerical error and at the same time provides an
adaptive indicator for reducing the error through targeted refinement.
We present results for the compressible Navier-Stokes simulations in
two and three dimensions that demonstrate the accuracy of the error
estimates and the efficiency of the proposed output-based adaptation
approach.  We compare strategies using not only degrees of freedom,
but also computational time.  We show that for large and complex
problems output error estimation and adaptation can have a significant
impact on robustness and efficiency of the solution algorithm.

Time: 12:30 pm

Location: Room 224.3, Hauptgebäude, RWTH Aachen, Templergraben 55, 52056 Aachen