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Confined-crest impact. Forces dimensional analysis and extension of the Goda's formulae to recurved parapets
- Publication Year :
- 2020
- Publisher :
- Elsevier B.V., 2020.
-
Abstract
- In this paper, an extended numerical analysis of the “confined-crest impact” (hereinafter referred as “C–CI”), induced by non-breaking waves on recurved parapet walls, is presented to better understand the physics and characteristics of this impulsive wave phenomenon, which significantly depends on the geometry of the parapet (here made by a sector of circumference) as well as on non-breaking wave steepness. A dimensional analysis of the forces has been carried out and used to analyse the results obtained by numerical CFD computations. The numerical simulations, performed for different radii of curvature, opening angles and incoming wave characteristics (changing both the wave height H and wave period T), have shown that the maximum impulsive pressure: (i) takes place on the top of the recurved parapet and decreases moving towards the S W L , where it tends to vanish; (ii) tends to decrease as the radii of curvature and the incoming wave characteristics (wave height H and period T) increase. However, this reduction in the maximum pressure, is always accompanied by an increase of the forces acting on the recurved parapet and a decrease of the wave overtopping volumes. Moreover, the maximum wave induced pressures have been examined by means of regular and irregular wave conditions in order to analyse the possibility of schematising the effects (i.e. forces) of an irregular sea state with those of a regular one, providing an equivalent force and therefore saving computational time. Based on the new results, a schematization of the pressure diagram induced by the C–CI impact has been proposed, used to extend the Goda-Takahashi pressure diagrams, valid for vertical walls in non-breaking wave conditions, including recurved walls.
- Subjects :
- Physics
design pressure diagrams
extended Goda's formulae
impulsive pressures
non-breaking waves
recurved parapet wall
vertical breakwaters
Environmental Engineering
010504 meteorology & atmospheric sciences
010505 oceanography
business.industry
Numerical analysis
Ocean Engineering
Non-breaking wave
Mechanics
Sea state
Computational fluid dynamics
Impulsive pressure
Circumference
Curvature
Vertical breakwater
01 natural sciences
Design pressure diagrams
Recurved parapet wall
Wave height
Crest
Parapet
business
Extended Goda's formulae
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....c2ba31aa7f5ff282518a22d6f7128dc1