Turbulence characteristics of flow field around a cylindrical obstacle placed in a trapezoidal channel
Yükleniyor...
Dosyalar
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
HARD
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
This 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..
Açıklama
Anahtar Kelimeler
Turbulence Statistics, Spectral Analysis, Autocorrelation
Kaynak
POLISH JOURNAL OF ENVIRONMENTAL STUDIES
WoS Q Değeri
N/A
Scopus Q Değeri
Q2
Cilt
27
Sayı
3
