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Sensitivity computations by algorithmic differentiation of a high-­order cfd code based on spectral differences

Cardesa, José I. and Airiau, Christophe Sensitivity computations by algorithmic differentiation of a high-­order cfd code based on spectral differences. (2020) In: Aerospace Europe conference 2020, 25 February 2020 - 28 February 2020 (Bordeaux, France).

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Abstract

We compute flow sensitivities by differentiating a high-­order computational fluid dynamics code. Our fully discrete approach relies on automatic differentiation (AD) of the original source code. We obtain two transformed codes by using the AD tool Tapenade (INRIA), one for each differentiation mode: tangent and adjoint. Both differentiated codes are tested against each other by computing sensitivities in an unsteady test case. The results from both codes agree to within machine accuracy, and compare well with those approximated by finite differences. We compare execution times and discuss the encountered technical difficulties due to 1) the code parallelism and 2) the memory overhead caused by unsteady problems.

Item Type:Conference or Workshop Item (Paper)
HAL Id:hal-02639065
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Funders:
RTRA STAE, Toulouse - European Union’s Seventh Framework Programme
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Deposited On:28 May 2020 09:26

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