The effects of localized blowing on pressure-velocity correlation

ORAL

Abstract

It is well known that wall pressure fluctuations are footprints of the large coherent motions existent in the outer region of the boundary layer. In this investigation, spatial-temporal correlations of the pressure and velocity fields are computed in a spatially-developing turbulent channel flow with five-blowing jets located at the bottom wall and along the spanwise direction. Direct numerical simulations are performed at a friction Reynolds number of 394. The main purpose behind the present study is to assess the influence of perturbing blowing jets on the large scale structures of the turbulent channel flow. Furthermore, the key role of pressure fluctuations on the energy redistribution among the velocity components is scrutinized by computing the energy budgets of tke and Reynolds stresses, and a physical mechanism is proposed to explain the outer peak on turbulence production due to localized blowing.

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Authors

  • Can Liu

    Department of Mechanical Engineering, Texas Tech University

  • Guillermo Araya

    Texas Tech University, Texas Tech University, Lubbock, TX, National Wind Resources Center, Texas Tech University, Lubbock, TX, USA, Department of Mechanical Engineering, Texas Tech University

  • Luciano Castillo

    Texas Tech University, Texas Technical University, Texas Tech University, Lubbock, TX, National Wind Resources Center, Texas Tech University, Lubbock, TX, USA, Department of Mechanical Engineering, Texas Tech University, Texas Tech Univ

  • Stefano Leonardi

    Department of Mechanical Engineering, University of Texas at Dallas, University of Texas Dallas, The University of Texas at Dallas