DNS of Turbulent Boundary Layer with Time-Periodic Blowing Through a Spanwise Slot

Abstract

Direct numerical simulations are extended to see the effects of time-periodic blowing frequency from a spanwise slot on a turbulent boundary layer. The time-periodic blowing frequency is given in a range 0 < or = f < or = 0.08 at a fixed blowing amplitude of A+=0.5. The effects of the blowing frequency are scrutinized by examining the phase- or time-averaged turbulent statistics. A most effective blowing frequency is obtained at f+=0.03, where the maximum increases of Reynolds shear stress, streamwise vorticity fluctuations and energy redistribution are made. The phase-averaged stretching and tilting terms are studied for analyzing the increase of streamwise vorticity fluctuations which is closely related to turbulent coherent structures.

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Document Details

Document Type
Technical Report
Publication Date
Apr 15, 2005
Accession Number
ADA447219

Entities

People

  • H. J. Sung
  • Keehoon Kim

Organizations

  • KAIST

Tags

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Computational Fluid Dynamics
  • Energy
  • Energy Transfer
  • Engineering
  • Flow
  • Fluid Dynamics
  • Friction
  • Layers
  • Mechanical Engineering
  • Numerical Analysis
  • Pressure Gradients
  • Shear Stresses
  • Skin Friction
  • Turbulent Boundary Layer
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.