TY - JOUR
T1 - Experimental study on the interaction between turbulent boundary layer and wake behind various types of two-dimensional cylinders
AU - Ikegaya, N.
AU - Morishige, S.
AU - Matsukura, Y.
AU - Onishi, N.
AU - Hagishima, A.
N1 - Funding Information:
The authors are grateful to Dr. Tsuru (Assistant professor in Faculty of Engineering Sciences, Kyushu University) for assistance for PIV measurements. This work is supported by JSPS KAKENHI Grant Numbers JP17H04946 , JP17KK0117 .
Funding Information:
The authors are grateful to Dr. Tsuru (Assistant professor in Faculty of Engineering Sciences, Kyushu University) for assistance for PIV measurements. This work is supported by JSPS KAKENHI Grant Numbers JP17H04946, JP17KK0117.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/9
Y1 - 2020/9
N2 - The interaction between the turbulent boundary layer and wake behind various types of two-dimensional cylinders is examined based on the velocity measurements by hot-wire anemometry and particle image velocimetry. Three types of cylinders, such as circular, square, and 1:5 rectangular cylinders, of two different diameters of 5 mm and 10 mm were employed in this study. The streamwise velocity distributions of the wake flow showed that its width is sustained in the streamwise direction within the boundary layer because of its interaction with the turbulent boundary layer flow. Interestingly, this phenomenon was observed regardless of the cylinder shapes. The momentum exchange in both spanwise and vertical directions showed that the advective momentum flux considerably contributes to momentum budget in the wake flow owing to the weak vertical flow formed within the boundary layer. Consequently, the spanwise width of the wake does not expand in the streamwise direction due to the alternation of the momentum budget. The results of this study can contribute to clarifying the effect of interaction between the wake and the turbulent boundary layer, as well as explain the sustaining mechanics of the low speed streaks formed within the turbulent boundary layer, even for different origins of the low-speed regions.
AB - The interaction between the turbulent boundary layer and wake behind various types of two-dimensional cylinders is examined based on the velocity measurements by hot-wire anemometry and particle image velocimetry. Three types of cylinders, such as circular, square, and 1:5 rectangular cylinders, of two different diameters of 5 mm and 10 mm were employed in this study. The streamwise velocity distributions of the wake flow showed that its width is sustained in the streamwise direction within the boundary layer because of its interaction with the turbulent boundary layer flow. Interestingly, this phenomenon was observed regardless of the cylinder shapes. The momentum exchange in both spanwise and vertical directions showed that the advective momentum flux considerably contributes to momentum budget in the wake flow owing to the weak vertical flow formed within the boundary layer. Consequently, the spanwise width of the wake does not expand in the streamwise direction due to the alternation of the momentum budget. The results of this study can contribute to clarifying the effect of interaction between the wake and the turbulent boundary layer, as well as explain the sustaining mechanics of the low speed streaks formed within the turbulent boundary layer, even for different origins of the low-speed regions.
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U2 - 10.1016/j.jweia.2020.104250
DO - 10.1016/j.jweia.2020.104250
M3 - Article
AN - SCOPUS:85087522495
SN - 0167-6105
VL - 204
JO - Journal of Wind Engineering and Industrial Aerodynamics
JF - Journal of Wind Engineering and Industrial Aerodynamics
M1 - 104250
ER -
