| Abstrakt: |
Several flow visualization techniques are applied on the computed hydrodynamic fields for the oscillatory flow around wall-mounted cylinder with a Keulegan−Carpenter KC = 20. To solve the three-dimensional Navier−Stokes equations, the direct numerical simulation is conducted using Open-source Field Operation and Manipulation (OpenFOAM®). Details obtained from such flow visualizations increase in dimensionality and complexity. Streamlines, contours of dynamic pressure over the cylinder surface and wall shear stress in the vicinity of the cylinder-wall junction surface contours, and coherent structures using Q-criterion represent lineal-, areal-, and volume-based flow features, respectively. Line integral convolution as well as particle trajectories are shown at different phases of the background oscillatory flows to illustrate and describe the underlying flow mechanisms. |
