Abstract
A global instability analysis has been performed to study the influence of buoyancy on flow past a circular cylinder placed near a moving wall for −1 ≤ Ri ≤ 1 at a fixed value of G/D = 0.3 and a constant Re = 105. An open source finite-volume code OpenFOAM has been used. Selective frequency damping (SFD) method is implemented and used for calculations of the base flow. For the solution of the perturbation quantities linearized Navier-Stokes equations have been implemented in OpenFOAM. The growth rate and frequency have been obtained using the power iteration method. It has been observed that the flow is steady for Ri = 0 while it becomes unsteady for both positive and negative buoyancies. The most unstable modes appear as the traveling modes. These modes are similar to the Kelvin-Helmholtz (KH) modes with some distortion due to the presence of the moving wall.
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