The purpose of this paper is to consider physical mechanism of the effects of corner modification on aerodynamic characteristics of a type of square cylinder. We carried out wind tunnel tests for the measurements of the surface pressure acting on a square section cylinder with chamfered corner and rounded corner in uniform and turbulent flow. In addition, three-dimensional numerical simulation are performed for a two-dimensional cylinder in smooth flow. On the basis of the experimental data accompanied with numerical results, we presume the mechanism of aerodynamic force reduction and reach conclusions.
