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In this work the authors have studied the applicability of the 2D URANS approach adopting a block structured mesh and Menter’s SST k-omega turbulence model for the aspect ratio 4 rectangular cylinder. As a first step, a verification study is carried out for the mesh refinement level and the time step size. Then, the static response for a 0o angle of attack is considered for validation purposes. The vortex induced vibration response is computed based on the outof-phase component and phase angle of a one degree of freedom heave forced oscillation simulation at different reduced velocities. Finally, the flutter derivatives are evaluated based on the results of forced induced oscillations in both heave and pitch degrees of freedom. The computational results obtained herein have been in agreement with both experimental and numerical data available in the literature. The proposed methodology based on 2D URANS is less computer power demanding than a 3D LES approach, while it keeps a good accuracy level, which is of particular interest in the frame of industrial applications.

Application of 2D URANS in fluid structure interaction problems of rectangular cylinders