Turbulence characteristics of flow field around a cylindrical obstacle placed in a trapezoidal channel

WOS: 000427520400017This paper describes measurements of the turbulence surrounding a vertical cylinder in a steady flow. The approximate size of circulations and eddies produced by a cylindrical obstacle subject to steady flow in a trapezoidal channel are investigated. A four-component high-sampling frequency acoustic doppler velocimeter (ADV) was used to collect flow data, which were filtered using effective filtering algorithms before being processed. Because the turbulence is three dimensional, calculations were performed for all three directions. The energy distribution and dependence of the fluctuating velocities were determined and interpreted using an autocorrelation function and spectral analysis. Important turbulence statistics were calculated, including Reynolds stresses, integral time scales, and integral length scales. For representative points, the approximate size of the turbulent eddy was calculated. A spectral density function was generated and analyzed. The results show that highly coherent and dependent structures are visible in the wake vortices region for each axis..Scientific and Technological Research Council of Turkey (TUBITAK)The author is grateful for the postdoctoral support provided by the Scientific and Technological Research Council of Turkey (TUBITAK). I also thank Prof. Ben Hodges at CRWR UT at Austin for permission to use the experimental setup