Flow Field around a Vertical Cylinder in Presence of Long Waves: An Experimental Study

Long waves caused by storm surges or river floods can significantly impact marine and fluvial structures such as bridge piers. Apart from the forces that they generate on structure, also contribute to formation of turbulent eddies downstream obstacle. This is relevant, in this way affect both an erodible bottom ecosystem. The present study describes a medium-scale experiment, which propagation two different long released steady current investigated presence bottom-mounted rigid emergent cylinder. Velocity measurements were acquired Particle Image Velocimetry (PIV) system, providing instantaneous flow velocity vectors selected 2D planes. For each experimental condition, time-varying field near cylinder was examined vertical horizontal First, we tested analytical theory approximated method best represent waves. After this, estimated maps vorticity obstacle finally processed signals means wavelet-based technique, derive length scales eddies. In way, specifically derived how spreading coherent depends features flume, cylinder, wave.