Numerical and expermental investigation of flow around yawed cylinders in tandem arrangement

The aim of present research is to investigate the flow structure around a single yawed cylinder and two yawed cylinders both numerically and experimentally. In this purpose, the main circular was 50 mm in diameter and 60 cm in length is set against the fluid flow for the single cylinder case at a Reynolds number = 5000.The paricle imaging velocimetry (PIV) technique is used to investigate the wake structure experimentally. Single yawed cylinder was investigated in the water tunnel under steady upstream cross-flow conditions with angle configurations from α = 0o to 60o with 5o increments. For the case of two yawed cylinders, in order to understand the effects of gap ratio and yaw angle on the flow structure around two yawed cylinders in tandem, nine different gap ratios from L/D = 1 to 5 with 0.5 increments and five different yaw angles of α = 0, 15, 20, 25 and 30 were considered. ANSYS CFX software was used for numerical studies. The results obtained from CFX were compared with PIV results. SST turbulence model that was based on k – ω was used for the turbulence modeling.