Abstract
In this paper, a Panamax Bulk Carrier with bulbous bow and U-shaped stern with a scale ratio of 1/45 is studied. Measurements and mechanistic studies are carried out for a three-dimensional three-component (3D-3C) wake field using a customized towed underwater two-dimensional stereoscopic particle image velocimetry (2D-3C SPIV) system. The 2D-3C wake field data with multiple planes is obtained from the scanned PIV measurements of multiple 2D planes, this data is used to reconstruct the 3D-3C wake field. The reconstructed volumetric measurement area is a cuboid region with a length of 300 mm, width of 320 mm and height of 280 mm. Next, the spatial distributions of dimensionless axial u/U, lateral v/U and vertical w/U velocities are studied in detail based on the reconstructed 3D-3C wake field. The velocity data is used to analyze the dimensionless velocity magnitude in Y-Z Plane S/U and dimensionless average kinetic energy. Finally, the spatial distribution of vortices in the wake field is characterized. The 3D-3C measurements reveal the behavior of vortices and turbulent structures in the hull. These findings are essential for the adaptive wake designing of the propeller and hydrodynamic appendage.
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