Direct numerical simulation of a turbulent boundary layer over an oscillating wall
Date of Issue2011
School of Mechanical and Aerospace Engineering
Direct Numerical Simulations have been performed to study the effect of a partially oscillating wall on the turbulent boundary layer. Even though the Reynolds number is three times lower than in previous experimental investigations, many of the characteristic flow features are confirmed. The drag reduction is of the same magnitude as for higher Reynolds number flows, and the spatial development follows closely earlier experimental findings. The reduction of Reynolds shear stress is more pronounced than the decrease in streamwise and normal velocity fluctuations. In addition, comparisons are made with earlier numerical studies of channel flow. The sensitivity of the Reynolds shear stress on the time allowed for statistics collection is scrutinised, and the discrepancy in results from earlier experiments are, thus, explained.
Journal of turbulence
© 2011 Taylor & Francis. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Turbulence, Taylor & Francis. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1080/14685248.2010.538397].