ABSTRACT
Suction is a kind of active aerodynamic approaches. It controls wind fields around an object through absorbing kinetic energy of the flow. The steady suction approach has long been used to suppress flow separations. As a typical work, Prandtl employed suction on the cylinder surface to reduce drag in 1904 (Schlichting and Gersten 2000). In 2007, Zha et al. (2007) applied the coflow-jet flow method to airfoils, and demonstrated that the coflow-jet flow method could increase lift-to-drag ratio. Recently, steady suction has been introduced into civil engineering. Xin et al. (2011) first conducted numerical simulations to analyze the efficiency of suction for increasing flutter stability of long-span bridges. Their computational results indicate that suction makes the main streamlines close to the section surface and reduces the aerodynamic torque under the torsional movement of the bridge section model, and the flutter stability of the longspan bridge is improved by the steady suction.
