Wei, M.X.; Chiew, Y.M., and Guan, D.W., 2018. Flow behavior of Propeller Jet around an Open-Type Quay. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 956–960. Coconut Creek (Florida), ISSN 0749-0208.
The flow characteristics of a confined ship-propeller jet in the presence of an open-type quay slope with a rigid bed were experimentally studied using particle image velocimetry (PIV) technique. In the study, the toe clearance (Xt), namely the horizontal distance between the propeller and slope toe, was varied from 2Dp to 9Dp, where Dp = propeller diameter (= 7.5 cm). The propeller speed (n) and clearance height (Zb) were 500 rpm and 7.5 cm (= 1Dp), respectively. In each test, the field of view of the PIV measurement was focused on a rectangular region (∼30 cm × 20 cm) around the slope toe, which is the location of the greatest interest for engineering problems, such as scour damages in the case of an erodible seabed. The jet evolutions under different toe clearances are presented in the form of mean velocity and turbulence intensity from an overall perspective of the selected field of view. Due to the asymmetrical entrainment of the ambient fluid above and below the jet, observations reveal that the jet has a tendency to impinge onto the bed or quay slope. With increasing toe clearances, the jet undergoes significant diffusion before it reaches the slope. However, the turbulence intensity profiles show that the presence of slope causes a significant increase of turbulence in the near-bed region.
