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DNS of Turbulent Boundary Layers in the Quasi-Laminarization Process

  • Guillermo ArayaEmail author
  • Luciano Castillo
  • Fazle Hussain
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 23)

Abstract

In this investigation, Direct Numerical Simulations (DNS) of turbulent spatially developing boundary layers (SDBL) with prescribed Very Strong Favorable Pressure Gradients (VSFPG) are performed by means of the Dynamic Multi-scale Approach (DMA) developed by Araya et al. JFM, 670:518–605, 2011 [1]. Although the prescription of an external VSFPG significantly reduces turbulence production, the flow never becomes completely laminar due to the finite value of the streamwise Reynolds normal stress, and thus the flow is quasi-laminar. In this sense, the mean flow carries the footprint of turbulence, particularly in the streamwise direction of the Reynolds stresses. In addition, the vertical transports toward the wall of \(\overline{v'^{2+}}\) and \(\overline{uv'^{+}}\) practically disappear in the inner region and significantly decrease in the outer region of the boundary layer during the quasi-laminarization stage. As a consequence, the “communication” between inner and outer regions is seriously restricted.

Keywords

Direct Numerical Simulation Reynolds Shear Stress Vertical Transport Freestream Velocity Acceleration Parameter 
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

GA acknowledges XSEDE (Project Number: TG-CTS120046) and SCOREC (Scientific Computation Research Center, Rensselaer Polytechnic Institute) for supplying computational resources.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Guillermo Araya
    • 1
    Email author
  • Luciano Castillo
    • 1
  • Fazle Hussain
    • 1
  1. 1.Texas Tech UniversityLubbockUSA

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