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A Discrete Adjoint Approach for the Optimization of Unsteady Turbulent Flows

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Abstract

In this paper we present a discrete adjoint approach for the optimization of unsteady, turbulent flows. While discrete adjoint methods usually rely on the use of the reverse mode of Automatic Differentiation (AD), which is difficult to apply to complex unsteady problems, our approach is based on the discrete adjoint equation directly and can be implemented efficiently with the use of a sparse forward mode of AD. We demonstrate the approach on the basis of a parallel, multigrid flow solver that incorporates various turbulence models. Due to grid deformation routines also shape optimization problems can be handled. We consider the relevant aspects, in particular the efficient generation of the discrete adjoint equation and the parallel implementation of a multigrid method for the adjoint, which is derived from the multigrid scheme of the flow solver. Numerical results show the efficiency of the approach for a shape optimization problem involving a three dimensional Large Eddy Simulation (LES).

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  1. Technische Universität Darmstadt, Dolivostraße 15, 64293, Darmstadt, Germany

    Rolf Roth & Stefan Ulbrich

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  1. Rolf Roth
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  2. Stefan Ulbrich
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Correspondence to Rolf Roth.

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Roth, R., Ulbrich, S. A Discrete Adjoint Approach for the Optimization of Unsteady Turbulent Flows. Flow Turbulence Combust 90, 763–783 (2013). https://doi.org/10.1007/s10494-012-9439-3

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