Actuation response model from sparse data for wall turbulence drag reduction

Physical Review Fluids, vol. 5

Abstract

Drag reduction of an actuated turbulent boundary layer at a momentum-thickness-based Reynolds number Re${}_{\ensuremath{\theta}}$ = 1000 is computed, modeled, and predicted. The drag reduction for the set of actuation parameters is modeled using 71 large-eddy simulations. This drag model allows extrapolation outside the actuation domain for larger wavelengths and amplitudes. The modeling novelty combines support vector regression for interpolation, a parametrized ridgeline leading out of the data domain, a scaling for the drag reduction, and a discovered self-similar structure of the actuation effect.

Authors 6

1. Daniel Fernex

   Technische Universität Braunschweig

   Affiliation as printed

   Institut für Strömungsmechanik, Technische Universität Braunschweig, Hermann-Blenk-Str. 37, 38108 Braunschweig, Germany

   [Braunschweig University of Technology]

2. Richard Semaan

   Technische Universität Braunschweig

   Affiliation as printed

   Institut für Strömungsmechanik, Technische Universität Braunschweig, Hermann-Blenk-Str. 37, 38108 Braunschweig, Germany

3. Marian Albers Aachen Institute of Aerodynamics

   RWTH Aachen University

   Affiliation as printed

   Institute of Aerodynamics, RWTH Aachen University, Wüllnerstr. 5a, 52062 Aachen, Germany

4. Pascal S. Meysonnat Aachen Institute of Aerodynamics

   RWTH Aachen University

   Affiliation as printed

   Institute of Aerodynamics, RWTH Aachen University, Wüllnerstr. 5a, 52062 Aachen, Germany

5. Wolfgang Schröder Aachen Institute of Aerodynamics

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   Institute of Aerodynamics, RWTH Aachen University, Wüllnerstr. 5a, 52062 Aachen, Germany

   JARA - High-Performance Computing, Forschungszentrum Jülich, 52425 Jülich, Germany

   JARA – High-Performance Computing, Forschungszentrum Jülich, 52425 Jülich, Germany

6. Bernd R. Noack

   Harbin Institute of Technology · Technische Universität Berlin · Technische Universität Braunschweig

   Affiliation as printed

   Institut für Strömungsmechanik und Technische Akustik (ISTA), Technische Universität Berlin, Müller-Breslau-Straße 8, 10623 Berlin, Germany

   Institut für Strömungsmechanik, Technische Universität Braunschweig, Hermann-Blenk-Str. 37, 38108 Braunschweig, Germany

   Institute for Turbulence-Noise-Vibration Interactions and Control, Harbin Institute of Technology, 58800 Shenzhen, China