Smoothed-particle hydrodynamics

Engineering

Geotechnical engineering

Wave height

Marine engineering

Coupling (piping)

Supercavitation

Acoustics

Geology

Mooring

Oceanography

Paleontology

Mechanical engineering

Type (biology)

Physics

Cavitation

Optics

Ballast

Attenuation

Breakwater

Mechanics

Deck

Coastal Engineering

The wave-attenuation performances and hydrodynamics of moored box-type floating breakwaters with the same weight, same wall thickness, and six different cross-sections, i.e. circular, triangle-down, triangle-up, rectangular, trapezoid-down, and trapezoid-up, are investigated numerically using the smoothed particle hydrodynamics (SPH) method. Coupling between DualSPHysics and MoorDyn is implemented in the coupled SPH-mooring model. The effects of the key parameters, such as the breakwater density, immersion depth, ballast-water gravity, and wave condition, on wave-attenuation performance are examined systematically. The results reveal that the performances of floating breakwaters are significantly affected by the immersion depth and wave condition, however, they are hardly affected by density and ballast-water gravity. Furthermore, the top deck is found to be an extremely effective part of a well-designed breakwater, and asymmetrical designs such as longer top-faces and shorter bottom-faces should be adopted for achieving reasonable material utilizations. Irrespective of the shapes of the cross-sections, the best performances of the different breakwaters are almost at the same level after careful designs are implemented. Importantly, a strong relationship is identified between the motions, mooring tensions, and wave-attenuation performances, which implies that the motions are directly proportional to the wave-attenuation performances and the mooring tensions.

Numerical studies of submerged moored box-type floating breakwaters with different shapes of cross-sections using SPH