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PRESSURE FLUCTUATION IN HIGH-REYNOLDS NUMBER TURBULENT BOUNDARY LAYER; RESULTS FROM EXPERIMENTS AND NUMERICAL SIMULATIONS

Yoshiyuki Tsuji
KTH Mechanics, Royal Institute of Technology, 100 44 Stockholm, Sweden; Department of Energy Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8503, Japan

Shintaro Imayama
Department of Energy Engineering and Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan; Linne Flow Center, KTH Mechanics, SE-100 44 Stockholm, Sweden

Phillipp Schlatter
Linne FLOW Centre and Swedish e-Science Research Centre (SeRC) KTH Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

P. Henrik Alfredsson
Liné Flow Centre, KTH Mechanics, Osquars Backe 18, SE-100 44 Stockholm, Sweden

Arne V. Johansson
Linne FLOW Centre, Dept. of Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

Abstrakt

Pressure fluctuations are measured in zero-pressure-gradient boundary layers. Following the previous studies, we developed the small pressure probe and measure both the static pressure inside boundary layer and wall pressure simultaneously in turbulent boundary layers up to Reynolds numbers based on the momentum thickness Rθ ~ 20000. Discussions are made on the background pressure in the free stream region. It contaminates the physical pressure in the boundary layer. We report on the pressure intensity profile normalized by outer and inner variables. Once the background pressure is subtracted, they are compared with the results of direct numerical simulations.