The flow around cylinder open the path for studying more complex shape bodies that still keep in their external flow properties the combinations of the flow properties of simpler bodies like flat plates, cylinders, ellipses. The aim of this study is to describe flow around cylinders with and without grooves based on numerical simulations. The two positions of groove were taken. The inlet flow properties are velocity of 10 m/s, density of 1.225 kg/m3, static pressure of 101325 Pa.