This paper deals with drag forces due to irregular waves on a vertical slender structure in the splash zone, i.e. in the vicinity of still-water free surface, by considering the inundation effect due to instantaneous wave elevation. The force turns out to be a third-order quantity with respect to wave elevation. The focus of this paper is however limited to extreme value prediction of this force in stochastic waves. Based upon a transformation of random variables and use of the Rice formula, the mean up-crossing rate of inundation drag force is obtained in the frequency domain both by direct numerical integration and asymptotic evaluation for high levels using the Laplace method. The extreme value distribution of this force is then established by the Poisson probability law assuming independent up-crossing events. The proposed method agrees very well with time-domain simulations both for the mean up-crossing rate and the extreme value prediction. The effect of correlation between wave elevation and horizontal water particle velocity and the presence of current have been studied.


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    Title :

    Extreme value prediction of inundation drag force with and without current


    Additional title:

    Extremwertvorhersage der Überflutungswiderstandskraft mit und ohne Strömung


    Contributors:
    Gao, Zhen (author) / Moan, Torgeir (author)

    Published in:

    Ocean Engineering ; 36 , 15-16 ; 1244-1250


    Publication date :

    2009


    Size :

    7 Seiten, 24 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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