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The field characteristics of two side-by-side rotating circular cylinders in   a cross-flow is investigated under different rotation types, at T/D =   1.11,1.6, and 3, respectively (T is the center spacing between the cylinders,   and D is the cylinder diameter). A similar flow pattern which is the most   efficient to narrow the lowpressure area is identified for rotation type A,   independent of T/D ratio, and two typical flow patterns are found under   different spacings for rotation type B and type C, respectively. It is   confirmed that there is an optimal rotational speed of 1.7-2, under rotation   type A to attenuate the vortices, velocity drop, and turbulence intensity   tremendously. As rotational speed increases to the optimal value, both the   velocity drop and turbulence intensity decrease and their distributions are   smooth. The results indicate that the shear layers which are accelerated   following the free-stream direction would have significant influence on the   flow modification, and different rotation types actually arrange these shear   layers in diverse ways to change the flow pattern. Pitch ratio is capable to   transform the gap flow, which is usually including the shear layers referred,   thus this parameter can modify the wake of the two cylinders at different   rotation types

Properties of the flow around two rotating circular cylinders in side-by-side arrangement with different rotation types