Hits:

Indexed by:期刊论文

Date of Publication:2017-01-15

Journal:OCEAN ENGINEERING

Included Journals:SCIE、EI

Volume:130

Page Number:471-481

ISSN No.:0029-8018

Key Words:Potential theory; Wave diffraction; Analytical derivation; Porous structure; Truncated cylinder

Abstract:An analytical model based on linear potential theory is proposed to predict the three-dimensional wave diffraction from a truncated cylinder with an upper porous sidewall and an inner column in the finite water depth. The velocity potential is analytically derived in the whole fluid domain based on the method of variable separation and eigen-function expansion technique. The continuous conditions of pressure and velocity potential are satisfied on the interface between the adjacent sub-domains. Wave forces are calculated directly from the incident and diffracted potentials. The model is validated in comparison with other published results of wave diffraction from a porous bottom-mounted cylinder and impermeable truncated cylinder, respectively. Then the numerical tests are performed to investigate the effects of the porous coefficient G, the draft ratio h/h(1) (h and h(1) mean the drafts of the porous part and whole cylinder, respectively), the ratio of the inner and outer radii b/a and the water depth d/h(1) (d means the water depth) on the wave forces acting on the structure. It is found that, by introducing an upper porous sidewall, the hydrodynamic loads are improved in comparison with the fully impermeable structure, which may be benefit to enhance the survivability of the relating marine structure.