“…In addition, flow over circular cylinders involve different fundamentals dynamic phenomena, such as boundary layer separation, shear layer development and vortex dynamic (Akbari & Price, 2005). The configurations with a cylinders pair in tandem and side by side are the most extensively discussed in the literature (Sumner et al, 1999;Deng et al, 2006;Silva et al, 2009), although the form more general is the staggered configuration ( Sumner et al, 2008;Sumner et al, 2005;Silva et al, 2009). According to the literature, there are various interference regimes, which were based on flow visualization in experiments.…”