Research using scale models in realistic wave conditions
combined with analytical work helped considerably in
enhancing understanding of the nature of the ship capsize
process, thus allowing for predictions of a vessel capsize using
either physical or numerical methods. However, unlike the
more established predictions of ship performance in calm water
and in waves (seakeeping), there are no accepted standards for
capsize predictions. Addressing this need, the 21st ITTC set up
a Specialist Committee on Ship Stability. The main tasks were
to examine techniques for carrying out model tests to
investigate capsize of intact and damaged vessels and provide
guidelines for such tests, and to assess the methods available for
numerical simulations of capsize of intact and damaged vessels.
In its second term, the Committee is coordinating a comparative
study of the available mathematical models for the prediction of
dynamic intact and damage stability in waves and of finalizing
guidelines for experimental testing of intact and damage
stability. Based partly on the ITTC work, this paper presents
state-of-the-art developments concerning the physics and
modeling of extreme ship motions and capsizing in heavy seas.
Regarding offshore applications, the paper describes three
major accidents where (damage) stability played a key role in
the foundering of the moored platforms. The subsequent
development of dynamic stability criteria for MODUs is
reviewed. The paper highlights similarities and differences
relevant to the numerical modeling of extreme motions of ships
and moored platforms.
Research using scale models in realistic wave conditionscombined with analytical work helped considerably inenhancing understanding of the nature of the ship capsizeprocess, thus allowing for predictions of a vessel capsize usingeither physical or numerical methods. However, unlike themore established predictions of ship performance in calm waterand in waves (seakeeping), there are no accepted standards forcapsize predictions. Addressing this need, the 21st ITTC set upa Specialist Committee on Ship Stability. The main tasks wereto examine techniques for carrying out model tests toinvestigate capsize of intact and damaged vessels and provideguidelines for such tests, and to assess the methods available fornumerical simulations of capsize of intact and damaged vessels.In its second term, the Committee is coordinating a comparativestudy of the available mathematical models for the prediction ofdynamic intact and damage stability in waves and of finalizingguidelines for experimental testing of intact and damagestability. Based partly on the ITTC work, this paper presentsstate-of-the-art developments concerning the physics andmodeling of extreme ship motions and capsizing in heavy seas.Regarding offshore applications, the paper describes threemajor accidents where (damage) stability played a key role inthe foundering of the moored platforms. The subsequentdevelopment of dynamic stability criteria for MODUs isreviewed. The paper highlights similarities and differencesrelevant to the numerical modeling of extreme motions of shipsand moored platforms.
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