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Wall-Turbulence Structure with Pressure Gradient Around 2D Hump

  • Aiko Yakeno
  • Soshi Kawai
  • Taku Nonomura
  • Kozo Fujii
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 165)

Abstract

Direct numerical simulation around a two-dimensional hump shape is conducted at the Reynolds number \(Re_{h} = 16,000\), based on the hump height. We investigate wall-turbulence structures around the hump in order to predict and control them to suppress separation. At this Reynolds number, specific striped wall-turbulence structure appears at the leading-edge near the wall surface. Its spanwise length-scale is close to that of the streak in a fully-developed turbulent channel flow. That is \(\lambda _{y} = 0.08\) scaled with the hump height, which corresponds to \(\lambda _{y}^{+} = 150\) in the local viscous unit. We identify two more different spanwise-correlated scales, \(\lambda _{y} = 0.40\) and 0.13 around the hump. Spanwise length-scale of \(\lambda _{y} = 0.40\) is around \(\lambda _{y}^{+} = 600\). On the other hand, the other scale \(\lambda _{y} = 0.13\) is not dependent on the local viscous scale.

Keywords

Reynolds Number Direct Numerical Simulation Turbulent Channel Flow Favorable Pressure Gradient Instantaneous Flow Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The computations in this study were conducted using the K supercomputer in the Advanced Institute of Computational Science, Riken. This research was mainly supported by Strategic Programs for Innovative Research (SPIRE) of the High Performance Computing Initiative (HPCI) (No. hp120296, hp130001, hp140207 and hp150219).

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Aiko Yakeno
    • 1
  • Soshi Kawai
    • 1
  • Taku Nonomura
    • 1
  • Kozo Fujii
    • 1
  1. 1.Institute of Space and Astronautical ScienceJapan Aerospace Exploration AgencySagamiharaJapan

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