The motivation to study the three-dimensional flows over bluff bodies has come from the wider scope of applications of the flow over building models, vehicles, any earth-fixed structures which are not stream-lined. Bluff bodies are widely available in engineering applications. There are still areas to comprehend in the flow physics of bluff bodies. In these cases the flow is typically turbulent and hence the complexity of the flow phenomenon is not easily explored until many attempts are made to establish the finding of a particular problem in this type of flow. These flows involve complex phenomena like separation and reattachment, unsteady vortex shedding and bimodal behavior, high turbulence, large-scale turbulent structures as well as curved shear layers. There is a great need in practice to predict such flows and the loading imposed on the bodies, but this is a difficult task even for relatively simple geometries. An attempt has been made to study experimentally the pressure distribution arising out of turbulent flow past a square-section cylinder arranged at different angles of attack to the oncoming flow. Fundamentally the study of flow past a square-section cylinder is widely found as a workhorse problem in aerodynamics. Most of the bluff bodies such as a building model or a circular cylinder need a basis to understand the pressure distribution around each of them. Therefore, the study of pressure distribution around a square cylinder would provide enough support to enhance the knowledge of aerodynamics of bluff bodies. In this study, subsonic wind tunnel was used to carry out the experiment over square-section cylinder kept at 0°, 22.5° and 45° to the oncoming flow. Three different Reynolds numbers were used for the study to get an understanding of coefficient of pressure (C_p) distribution at low to high turbulence of flow past the cylinder. The comparison of C_p was also done with the numerical values computed using the hybrid RANS/LES method. The details of the simulation technique and the experiment have been described in the paper. It was satisfying to note that the C_p values obtained from simulation and experiment were matched fairly well.

experiment, bluff body, square-section cylinder, turbulent flows, hybrid RANS/LES, coefficient of pressure.