A series of studies conducted at Massachusetts Institute of Technology (MIT) over the past seven years for the analysis of hydrodynamic interactions among legs for the support of a very large floating structure is reviewed. For general three-dimensional leg geometries and arbitrary configurations, an algebraic method for exact hydrodynamic interaction, which includes the effects of evanescent waves, has been developed. This method produces identical results compared with direct computations for hydrodynamic coefficients, first-order wave exciting forces and second-order steady-drift forces. Motions with and without the presence of linear elastic constraints, such as moorings or deck structures, are also obtained. When the numberof legs involved is extremely large, a matching idea is introduced which divides the total structure into an interior "core" plus a relatively small number of legs near the outer boundary. The interior core is treated as part of an infinite array and the "end" conditions are accounted for by considering the exact interactions between the interior core and the boundary legs. Finally, a method for the solution of the "inverse" hydrodynamic interaction problem is presented. In this, optimal arrangements of legs forminimum wave forces, displacements, ect. are obtained, subject to constraints specified, say, for the total length of the array.


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    Title :

    Hydrodynamic interaction analyses of very large floating structures


    Additional title:

    Berechnungen der hydrodynamischen Wechselwirkungen zwischen den Stuetzbeinen von sehr grossen schwimmenden Konstruktionen


    Contributors:
    Kagemoto, H. (author) / Yue, D.K.P. (author)

    Published in:

    Marine Structures ; 6 , 2/3 ; 295-322


    Publication date :

    1993


    Size :

    28 Seiten, 25 Bilder, 1 Tabelle, 24 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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