“…The upper and lower boundaries have been defined as slip walls, that is, neglecting viscous effects caused by the wall surface. Taking into account that in the region close to these boundaries the flow is practically undisturbed, given the distance of the upper and lower boundaries from the bluff body, this is similar to imposing the uniform value of the inlet velocity along these boundaries as in Fransos and Bruno (2010) or Sarwar and Ishihara (2010). The walls of the rectangular cylinder surface are modeled as no-slip, taking into account that in the forced oscillation simulations the kinematic requirement that no flow can cross the wall is enforced (Donea, Huerta, Ponthot, & Rodríguez-Ferrán, 2004).…”