Effect on horseshoe vortex by installing upstream tetrahedron in turbulent boundary layer

Abstract

The research on the effect of upstream tetrahedron on horseshoe vortex around circular cylinder was conducted. The difference between no tetrahedron and tetrahedron introduced case was investigated by PIV measurements. Velocity measurements conducted at spanwise center plane and spanwise shifted plane. It was confirmed that upstream tetrahedron reduce horseshoe vortex in both plane and lower height tetrahedron works better to reduce vortex.