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Active Control of Spatially Developing Turbulent Boundary Layers

Active Control of Spatially Developing Turbulent Boundary Layers
Ansprechpartner:

Alexander Stroh

Simulations of spatially developing turbulent boundary layers with localized application of three different control techniques aimed at reduction of skin friction drag. Considered control techniques are uniform blowing, body-force damping of wall-normal velocity component and opposition control.

Key Data

  • pseudo-spectral solver SIMSON
  • streamwise and spanwise periodicity of simulation domain
  • weak random forcing for turbulence tripping
  • Grid size Nx×Ny×Nz=3072×301×256
  • Domain size Lx×Ly×Lz=3000×120×100 (based on initial displacement thickness)
  • uncontrolled flow: Reθ=400-2500, Reτ=170-850
  • three control types: uniform blowing with 0.5%U, damping of wall-normal velocity component by imposition of body force and opposition control scheme
  • control region location: x=186-386

 

Datasets

Visualization

Video 1: Comparison of temporal development of controlled flows after control activation. Visualization of turbulent structures in turbulent developing boundary layer is performed using isosurfaces of λ2-criterion (λ2=-0.005) coloured by their streamwise velocity (first part of the video) and wall-normal coordinate (second part of the video).

References

Stroh, A., Hasegawa, Y., Schlatter, P., & Frohnapfel, B. (2016). Global effect of local skin friction drag reduction in spatially developing turbulent boundary layer. Journal of Fluid Mechanics, 805, 303-321, doi: 10.1017/jfm.2016.545
Bibtex citation: bibtex-file

Stroh, A., Frohnapfel, B., Schlatter, P., & Hasegawa, Y. (2015). A comparison of opposition control in turbulent boundary layer and turbulent channel flow. Physics of Fluids, 27(7), 075101, doi: 10.1063/1.4923234
Bibtex citation: bibtex-file

 

Contact

Please contact Alexander Stroh (stroh∂kit.edu) regarding further information on simulations and corresponding results.