The turbulent wake of a circular cylinder rotating about the streamwise axis

1994 ◽  
Vol 16 (6) ◽  
pp. 375-384
Author(s):  
D. H. Wood ◽  
P. L. Peterson ◽  
P. D. Clausen
Keyword(s):  
Circular Cylinder ◽  
Turbulent Wake

Control of the turbulent wake flow behind a circular cylinder by asymmetric sectoral hydrophobic coatings

2021 ◽  
Vol 33 (12) ◽  
pp. 121703
Author(s):  
Anatoliy Lebedev ◽  
Konstantin Dobroselsky ◽  
Alexey Safonov ◽  
Sergey Starinskiy ◽  
Veronica Sulyaeva ◽  
...  
Keyword(s):  
Circular Cylinder ◽  
Turbulent Wake ◽  
Wake Flow ◽  
Hydrophobic Coatings

Characteristics of vorticity fluctuations in a turbulent wake

1988 ◽  
Vol 189 ◽  
pp. 349-365 ◽  
Author(s):  
R. A. Antonia ◽  
L. W. B. Browne ◽  
D. A. Shah
Keyword(s):  
Circular Cylinder ◽  
Turbulent Wake ◽  
Probability Density Functions ◽  
The Self ◽  
Density Functions ◽  
Streamwise Vorticity ◽  
Local Isotropy ◽  
Vorticity Component ◽  
Vorticity Fluctuation ◽  
Made In

Measurements of the lateral components of the vorticity fluctuation have been made in the self-preserving turbulent wake of a circular cylinder. Each component was obtained separately using two X-wires separated in the appropriate lateral directions. The two velocity derivatives which make up the streamwise vorticity component were also determined but not simultaneously. An approximation to the streamwise vorticity was made from these measurements. Moments, probability density functions and spectra of the three vorticity components across the wake are presented and discussed. The high-wavenumber behaviour of the spectra is compared with calculations, based on local isotropy. Satisfactory agreement with the calculations is obtained for the lateral vorticity components over a significant high-wavenumber range. The approximated streamwise vorticity spectrum tends towards the isotropic calculation at very large wavenumbers.

scholarly journals The Structure of a Turbulent Wake Behind a Cruciform Circular Cylinder : 2nd Report, The Streamwise Development of turbulent flow field

1983 ◽  
Vol 26 (214) ◽  
pp. 521-528 ◽  
Author(s):  
Hideo OSAKA ◽  
Hidemi YAMADA ◽  
Ikuo NAKAMURA ◽  
Yoshimasa KUWATA ◽  
Yoshiro KAGEYAMA
Keyword(s):  
Circular Cylinder ◽  
Flow Field ◽  
Turbulent Flow ◽  
Turbulent Wake ◽  
Turbulent Flow Field

scholarly journals VELOCITY MEASUREMENTS OF TURBULENT WAKE FLOW OVER A CIRCULAR CYLINDER

2016 ◽  
Vol 42 ◽  
pp. 1660182
Author(s):  
CHANG-LUNG SHIH ◽  
WEI-CHENG CHEN ◽  
KEH-CHIN CHANG ◽  
MUH-RONG WANG
Keyword(s):  
Circular Cylinder ◽  
Accurate Determination ◽  
Diagnostic Techniques ◽  
Turbulent Wake ◽  
Wake Flow ◽  
Optical Methods ◽  
Velocity Measurements ◽  
Flow Measurements ◽  
Non Invasive ◽  
Comparison Results

There are two general concerns in the velocity measurements of turbulence. One is the temporal characteristics which governs the turbulent mixing process. Turbulence is rotational and is characterized by high levels of fluctuating vorticity. In order to obtain the information of vorticity dynamics, the spatial characteristics is the other concern. These varying needs can be satisfied by using a variety of diagnostic techniques such as invasive physical probes and non-invasive optical instruments. Probe techniques for the turbulent measurements are inherently simple and less expensive than optical methods. However, the presence of a physical probe may alter the flow field, and velocity measurements usually become questionable when probing recirculation zones. The non-invasive optical methods are mostly made of the foreign particles (or seeding) instead of the fluid flow and are, thus, of indirect method. The difference between the velocities of fluid and foreign particles is always an issue to be discussed particularly in the measurements of complicated turbulent flows. Velocity measurements of the turbulent wake flow over a circular cylinder will be made by using two invasive instruments, namely, a cross-type hot-wire anemometry (HWA) and a split-fiber hot-film anemometry (HFA), and a non-invasive optical instrument, namely, particle image velocimetry (PIV) in this study. Comparison results show that all three employed diagnostic techniques yield similar measurements in the mean velocity while somewhat deviated results in the root-mean-squared velocity, particularly for the PIV measurements. It is demonstrated that HFA possesses more capability than HWA in the flow measurements of wake flow. Wake width is determined in terms of either the flatness factor or shear-induced vorticity. It is demonstrated that flow data obtained with the three employed diagnostic techniques are capable of yielding accurate determination of wake width.

Wavelet analysis of the turbulent wake generated by an inclined circular cylinder

2010 ◽  
Vol 11 ◽  
pp. N15 ◽  
Author(s):  
S. F. Mohd. Razali ◽  
T. Zhou ◽  
A. Rinoshika ◽  
L. Cheng
Keyword(s):  
Circular Cylinder ◽  
Wavelet Analysis ◽  
Turbulent Wake
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