3D Integrated numerical model for fluid–structures–seabed interaction (FSSI): Elastic dense seabed foundation. (15th March 2016)

• Record Type: Journal Article
• Authors: Ye, Jianhong; Jeng, D.-S.; Chan, A.H.C.; Wang, R.; Zhu, Q.C.
• Is Part Of: Ocean engineering. Volume 115(2016)
• Page Start: 107
• Page End: 122
• Publication Date: 2016-03-15
• Subjects: Fluid–structures–seabed interaction (FSSI) -- Poro-elastic seabed foundation -- Dynamics of offshore structures -- 3D momentary liquefaction -- Caisson breakwater -- FSSI-CAS 3D; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2016.01.003
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: Economic losses and property damage due to the failure of offshore structures are huge each year in the world, under the attack of endless conventional wave, occasional tropical storms or typhoons, and possible tsunami. Wave-induced dynamics of offshore structures and their seabed foundation attract a great deal of attention from researchers and ocean engineers. Previous literature investigated the wave–structures–seabed interaction generally adopting 2D models and decoupled way. In this study, taking a caisson breakwater as the typical offshore structure, the simple linear interaction between ocean wave, a caisson breakwater and its poro-elastic seabed foundation is investigated by utilizing a three-dimensional integrated numerical model FSSI-CAS 3D. The numerical results indicate that FSSI-CAS 3D can effectively and sufficiently capture a variation of phenomena of wave-induced dynamics of offshore structures, and momentary liquefaction in its dense poro-elastic seabed foundation. This study demonstrates great promise of using the developed integrated numerical model in offshore industry to predict the dynamic response and stability of offshore structures by ocean engineers in design stage. Abstract : Highlights: Wave-induced dynamics of breakwater and its dense seabed is investigated. Interaction is investigated by a 3D integrated model FSSI-CAS 3D. Biot "u-p" formulation is used for dynamic soil behavior. Modified N–S equation is used for wave motion and porous flow. Very dense seabed soil and momentary liquefaction is the focus of interest.