Investigation on 3-D characteristics of flow around a yawed and inclined circular cylinder

A three-dimensional detached eddy simulation (DES) study was conducted to investigate the three-dimensional characteristics of the fully developed flow past a yawed and inclined circular cylinder. Flow at Reynolds number ( Re ) of 1.4×10 5 (based on freestream velocity U and the diameter of the cylinder D ) over a cylinder with axial lengths of 10 D , 20 D and 30 D was simulated. Spanwise wall boundary conditions were also studied to examine their effect on the flow field. The simulation shows that the flow is highly three-dimensional. The swirling flow with low pressure on the cylinder plays an important role in generating multiple moving forces, which can produce low-frequency loadings. The mechanism of generation of forces on the cylinder provides fundamental information necessary for the understanding of the oscillation of a yawed and inclined circular cylinder.