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Investigation of Large Scale Motion Interaction with the Near‐Wall Turbulence
Author(s) -
Richter Stefan,
Zanoun El-Sayed,
Egbers Christoph
Publication year - 2021
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.202000331
Subject(s) - reynolds number , turbulence , mechanics , reynolds decomposition , pipe flow , physics , reynolds stress equation model , scaling , turbulence modeling , flow (mathematics) , kinematics , turbulence kinetic energy , reynolds averaged navier–stokes equations , classical mechanics , k omega turbulence model , geometry , mathematics , reynolds equation
The main objective of the current work is to better understand the interaction of pipe flow large‐scale structures in the outer region with the near‐wall turbulence. To do so, a decomposition of velocity fluctuating signals has been adopted. Thus, the streamwise velocity fluctuation has been measured for three Reynolds numbers using two pipes located at the Brandenburg University of Technology (BTU). Three Reynolds numbers, Re b ≈ 6 × 10 4 , Re b ≈ 10 5 and at Re b ≈ 6 × 10 5 , have been examined, where Re b is the Reynolds number based on the bulk velocity ( U b ), the pipe diameter ( D ) and the kinematic viscosity (ν). For both pipe facilities, constant temperature hot‐wire anemometry has been utilized. The comparison of those three cases addresses the low and high Reynolds number effects on the structures of the outer and the inner regions of the pipe flow. Subsequently, Reynolds‐number scaling for such structures and their interaction with the buffer‐layer turbulence will be examined.