%0 Journal Article
	%A T. Zhou and  S. F. Mohd. Razali and  Y. Zhou and  H. Wang and  L. Cheng
	%D 2014
	%J International Journal of Mechanical and Mechatronics Engineering
	%B World Academy of Science, Engineering and Technology
	%I Open Science Index 85, 2014
	%T Phase-Averaged Analysis of Three-Dimensional  Vorticity in the Wake of Two Yawed Side-By-Side  Circular Cylinders
	%U https://publications.waset.org/pdf/9997036
	%V 85
	%X Thewake flow behind two yawed side-by-sidecircular 
cylinders is investigated using athree-dimensional vorticity probe. 
Four yaw angles (α), namely, 0°, 15°, 30° and 45° and twocylinder 
spacing ratios T*
 of 1.7 and 3.0 were tested. For T*
 = 3.0, there exist 
two vortex streets and the cylinders behave as independent and 
isolated ones. The maximum contour value of the coherent streamwise 
vorticity ~* ωx
 is only about 10% of that of the spanwise vorticity ~* ωz
. 
With the increase of α, 
~* ωx
 increases whereas ~* ωz
 decreases. At α = 
45°, ~* ωx
 is about 67% of ~* ωz
.For T* = 1.7, only a single peak is 
detected in the energy spectrum. The spanwise vorticity contours have 
an organized pattern only at α = 0°. The maximum coherent vorticity 
contours of ~* ω x
 and ~* ωz
 for T*
 = 1.7 are about 30% and 7% of those 
for T*
 = 3.0.The independence principle (IP)in terms of Strouhal 
numbers is applicable in both wakes when α< 40°.

 

	%P 27 - 36