ライブラリ登録: Guest
TSFP DL Home アーカイブ 執行委員会
TSFP DIGITAL LIBRARY ONLINE


ISSN オンライン: 2642-0554

WALL PRESSURE FLUCTUATIONS INDUCED BY COHERENT STRUCTURES IN TURBULENT PIPE FLOW

Mitul Luhar
Graduate Aerospace Laboratories California Institute of Technology Pasadena, CA 91125, USA; Aerospace and Mechanical Engineering University of Southern California Los Angeles, CA 90089, USA

Ati S. Sharma
Department of Aeronautics Imperial College London, SW7 2AZ UK; Engineering and the Environment University of Southampton Highfield, Southampton, SO17 1BJ, UK

Beverley J. McKeon
Department of Aeronautics, Imperial College London, SW7 2AZ, UK; Graduate Aerospace Laboratories California Institute of Technology Pasadena, CA 91125, USA

要約

We extend the simple forcing-response model developed by McKeon & Sharma (2010) to predict the wall pressure field associated with coherent structures in turbulent pipe flow. Realistic coherent structures such as modulating packets of hairpin vortices arise from the superposition of a small number of the velocity response modes predicted by this model. The wall pressure fluctuations associated with these velocity response modes capture many features observed in laboratory experiments and DNS, such as the location of pressure minima beneath coherent structures, the near-circular aspect ratio of wall pressure fluctuations, and the discrepancy in the characteristic length scales associated with the streamwise velocity and wall pressure fluctuations.