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Direct Numerical Simulation and PIV Measurement of Turbulent Boundary Layer over a Rod-Roughened Wall

  • Seung-Hyun Lee
  • Jae Hwa Lee
  • Hyung Jin Sung
Conference paper
Part of the IUTAM Bookseries book series (IUTAMBOOK, volume 22)

Abstract

The effects of surface roughness on a spatially-developing turbulent boundary layer were investigated by performing direct numerical simulation and particle image velocimetry measurements of TBLs over rough and smooth walls. Introduction of the roughness elements augmented turbulent stresses in the region of y< 4 ∼ 5k s , where k s is an effective sand roughness height. However, the roughness has little effect on the vorticity fluctuations, turbulent kinetic energy budget and quadratic components of Reynolds shear stress in the outer layer. We also demonstrate the modification of coherent vortical structures over the rod-roughened wall by using linear stochastic estimation.

Keywords

Particle Image Velocimetry Turbulent Kinetic Energy Direct Numerical Simulation Reynolds Stress Turbulent Boundary Layer 
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.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringKorea Advanced Institute of Science and Technology (KAIST)DaejeonKorea

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