Numerical simulation of flow features aroundheave plates oscillating close to a free surface or seabed
Published: 2014
Thiagarajan, Krish
Souto-Iglesias, Antonio
Bouscasse, Benjamin.
Colagrossi, Andrea
Publication Name: Proceedings 33rd Int. Conf. Ocean, Offshore and Arctic Engng. (OMAE 2014)
Abstract:
Performance of heave plates used in offshore structures is strongly influenced by their added mass and damping, which are affected by proximity to a boundary. A previous paper by the authors presented numerical simulations of the flow around a circular solid disk oscillating at varying elevations from seabed [1]. The force calculated was used to evaluate the added mass and damping coefficients for the disk. The simulations suggest that as the structure moves closer to the seabed the added mass and damping coefficients (Ca and Cb) increases continuously. In order to understand the physics behind the added mass and damping trends, when a heave plate is moving near a seabed or closer to the free surface, the flow characteristics around the heave plate are examined numerically in this paper. Flow around oscillating disks is dominated by generation and development of phase-dependent vortical structures, characterized by the KC number and the distance from the seabed or free surface to the heave plate. Numerical calculations presented in this paper have comprised the qualitative analysis of the vortex shedding and the.