Propagation Velocity and Space-Time Correlation of Perturbations in Turbulent Channel Flow
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Propagation Velocity and Space-Time Correlation of Perturbations in Turbulent Channel Flow

Propagation Velocity and Space-Time Correlation of Perturbations in Turbulent Channel Flow


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About the Book

A database obtained from direct numerical simulation of a turbulent channel flow is analyzed to extract the propagation velocity V of velocity, vorticity, and pressure fluctuations from their space-time correlations. A surprising result is that V is approximately the same as the local mean velocity for most of the channel, except for the near-wall region. For y(+) is less than or equal to 15, V is virtually constant, implying that perturbations of all flow variables propagate like waves near the wall. In this region V is 55 percent of the centerline velocity U(sub c) for velocity and vorticity perturbations and 75 percent of U(sub c) for pressure perturbations. Scale-dependence of V is also examined by analyzing the bandpass filtered flow fields. Comprehensive documentation of the propagation velocities and space-time correlation data, which should prove useful in the evaluation of Taylor's hypothesis is presented. An attempt was made to explain some of the data in terms of our current understanding of organized structures, although not all of the data can be explained this way. Kim, John and Hussain, Fazle Ames Research Center...


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Product Details
  • ISBN-13: 9781722703578
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 54
  • Spine Width: 3 mm
  • Width: 216 mm
  • ISBN-10: 1722703571
  • Publisher Date: 10 Jul 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 150 gr


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