Wake dynamics of an oscillating cylinder in steady currents
Flow around a cylinder undergoing sinusoidal oscillations in steady currents represents an idealized simplification of real flow phenomena in many practical applications. An example of practical applications involves a riser pipe attached to a floating vessel that undergoes periodic oscillations induced by surface waves, in the presence of a background current. The direction of the riser oscillation is not necessarily the same as the direction of the steady current, due to the difference in the generation mechanisms of the cylinder motion and the steady current. In engineering applications, prediction of hydrodynamic forces on the cylinder is often required in the design and maintenance of cylindrical marine structures. Fundamentally, understanding of the interaction between the cylinder oscillation and the flow around the cylinder is a prerequisite for predicting the hydrodynamic forces on the cylinder. Due to the complex nature of these interactions, there is a lack of reliable methods for predicting hydrodynamic forces on the cylinder undergoing oscillations in steady current. The present talk presents some recent research progresses, achieved through a discovery project funded by Australian Research Council, on the topic.