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Erschienen in:

2018 | OriginalPaper | Buchkapitel

Unsteady Simulation of the Separated Wake of a Transport Aircraft by Detached Eddy Simulation

verfasst von : Andreas Waldmann, Thorsten Lutz, Ewald Krämer

Erschienen in: New Results in Numerical and Experimental Fluid Mechanics XI

Verlag: Springer International Publishing

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Abstract

The work summarizes recent efforts concerning the simulation of massively separated wake flows of commercial transport aircraft configurations via detached-eddy simulation (DES). Two levels of grid resolution and two time step sizes were defined for the unsteady simulation runs, with the aim of improving the existing best practices with respect to this type of simulation. The number of time steps required for statistics convergence of the results is evaluated. In the flow field, comparisons of the results between the runs show that lowering the physical time step increases the velocity deficit in the wake. By comparison, the time step’s impact on the generation of large-scale turbulent structures near the wing is smaller in magnitude. The reduction of grid resolution strongly impacts prediction of the leading edge shear layer, leading to significantly lower pressure fluctuations on the wing. The discretization of convective mean flow fluxes was observed to play a significant role in the context of shear layer separation.

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Titel: Unsteady Simulation of the Separated Wake of a Transport Aircraft by Detached Eddy Simulation
verfasst von: Andreas Waldmann
Thorsten Lutz
Ewald Krämer
Verlag: Springer International Publishing
Buch: New Results in Numerical and Experimental Fluid Mechanics XI
Print ISBN: 978-3-319-64518-6

Electronic ISBN: 978-3-319-64519-3

Copyright-Jahr: 2018
DOI: https://doi.org/10.1007/978-3-319-64519-3_6

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