The flow dynamics is analyzed through two-dimensional numerical
simulations around two circular cylinders arranged side by side, with 4
combinations of alternating motions. All simulations are performed for Re =
1000, amplitude of oscillation (A)
equal to 3, frequency ratio (fr)
of 0.5, specific rotation (α) equal
to 0.5 and different values of spacing ratio (L/D). It is verified that
the combination of the type of movement, together with the position of one
cylinder in relation to the other, exerts significant influence on the flow
dynamics, as well as on the pressure distribution around the cylinder surface
and on the average values of the fluid dynamics coefficients. The smallest
value of the average pressure coefficient (Cp = -3.3), is obtained for the oscillating
cylinder when placed side by side with the clockwise rotation cylinder, case 3
and L/D = 1.5. On the other hand, the lowest mean drag coefficient (Cd = 1.0788), is obtained for
the cylinder with counterclockwise rotation, located in the lower position in
relation to oscillating cylinder in the upper position, with spacing between them of 1.5. Furthermore, it is observed that the
rotation movement is more effective in reducing drag than the
rotation-oscillation movement, for the studied frequency ratio.
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