Abstract
Aeration effects on wave loading are of considerable importance for offshore design. This paper describes experimental work to investigate four types of wave impact on a truncated vertical wall (representative of a plate in an FPSO vessel), in pure and aerated water. Investigations showed that high aeration and flip-through wave impacts are the most severe impact types and should therefore be considered for offshore structure design. It was also observed that there is a significant reduction in peak impact loads (both pressure and force) for impacts in aerated water compared to those in pure water. However, there was almost no reduction in impulsive loadings in aerated water compared to those in pure water, and therefore maximum instantaneous loads may be conservative in the presence of aerated water, in the implementation for offshore structure design. This paper is a companion paper to “Aeration effects on water-structure impacts: Part 1. Drop plate impacts”.
Highlights
Breaking wave impacts on vertical structures can produce very high loads, which may lead to structural failure and damage
The results show that the pressure impulses in aerated water are a little smaller than those in pure water for all types of wave impacts
This paper examined the role of aeration in wave impacts
Summary
Breaking wave impacts on vertical structures can produce very high loads, which may lead to structural failure and damage. The physics and characteristics of the impact loading have been shown by researchers to depend significantly on the breaking wave conditions (Oumeraci et al, 1993; Hattori et al, 1994). Kimmoun et al (2012) carried out experiments to investigate the influence of a bubble curtain on wave impacts on a vertical wall with the soliton and wave focusing techniques. They found that for cases using the wave-focusing technique, the location of the bubble generator and the injected air flow rate affect the wave breaking process; the variation of loads is increased while the area corresponding to the high loads is reduced. Kimmoun et al (2012) found that the compressibility of the aerated water does not seem to be of significant influence on wave impacts generated using the soliton wave technique
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