Large Eddy Simulation of Flow around Circular Cylinder at Reynolds Number at Reynolds Number of 10^5

Abstract

The present study is aimed to validate the open source code OpenFOAM for the turbulent flow around a circular cylinder, where such shape reflects the conventional offshore structures, using the large eddy simulation. The Reynolds number of10^5, which corresponds to the end of the subcritical flow regime, was considered to allow the more practical estimation of offshore structures. The dynamic k-equation eddy viscosity sub-grid scale models were employed to simulate the turbulent wakes based on the second-order finite volume method with central-difference schemes for the convection terms. Despite the fact that various attempts had been made to simulate the flow around the circular cylinders, the main focus of the previous studies was mainly on the comparison of the environmental loads due to the limited experimental data. For this reason, the experiments were also conducted in the Korea Research Institute of Ships and Ocean Engineering (KRISO)·s water channel, and Republic of Korea Air Force Academy (AFA)’s wind tunnel. The particle image velocimetry (PIV) and local pressure scanner system (PSI-8400) were used to obtain the mean flow fields such as the streamlines, vorticities, and Reynolds shear stresses as well as local pressure distributions in the circumferential direction of the cylinder surface. The drag force was calculated from the integration of the measured pressure distribution. Thus, the verificati