On the development of fast numerical methods for the estimation of hull girder loads for a flooded ship in waves

Acanfora, Maria; Balsamo, Flavio

doi:10.1016/j.oceaneng.2021.109213

Cited by 8 publications

(9 citation statements)

References 16 publications

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“…The apparent gravity technique has been applied both in the sloshing problems of partially filled tanks (i.e. given a constant amount of flooded water) 24,27 and in flooding problems (i.e. with variable amount of floodwater in time).…”

Section: Lumped Mass Model Based On the Apparent Gravity Methodsmentioning

confidence: 99%

“…At the scope, the flooded water forces per unit length are distributed linearly, over the flooded compartment length, depending on the water amount, and on the longitudinal and lateral coordinates of the lumped mass. 24 A two lumped mass model for a single compartment:…”

Section: Lumped Mass Model Based On the Apparent Gravity Methodsmentioning

confidence: 99%

“…The sea water pressure profile is assumed by applying the so called ''stretched distribution'' above the waterline: this approach is a kind of extension of the linear wave theory to incorporate the nonlinear effects associated with the variation of a ship's wetted surface. 26 The FloodW code, can handle flooded hull dynamics both for regular and irregular waves 18,24,27 by means of a proper coupling between ship and flooded water dynamics.…”

Section: Numerical Model Of Ship Dynamicsmentioning

confidence: 99%

“…-the convolution integral approach, depending on the solution of the potential problem, that is, radiated wave damping components, 25 (as shown in equation ( 4)); -direct use of the potential damping components at each wave frequency (mainly applicable in regular waves) 27 ; -implemented through linear and quadratic damping coefficients, if available 28,29 ; and -a combination of potential damping components with the quadratic damping coefficient. 24 The generation of the irregular wave train depends on the number of regular wave components and on the spectral description of the sea (type of the spectrum, zero-crossing period T z , and significant wave height H s ). Actually, a larger number of wave components, although beneficial for the irregular sea modeling in the time domain, is detrimental to the computational time.…”

Section: Numerical Model Of Ship Dynamicsmentioning

confidence: 99%

“…All outcomes are superposed to the available experimental data: it is possible pointing out an overall general agreement, that is, found particularly relevant for the roll motions. 24 For all damage cases, the numerical simulations are carried by using two different assumptions on the flooded water amount. The first one accounts for a variable amount of floodwater, given by the water exchange with the outside water (variable mass), while the second one assumes no communication with the outside water and thus a constant amount of floodwater in the compartment (constant mass).…”

Section: Frigatementioning

confidence: 99%

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A comprehensive description and application of the FloodW simulation code for flooded ship problems: From still water to irregular wave scenarios

Acanfora,

Altosole,

Coppola

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part M:

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This paper provides a compendium of the numerical model that goes under the name of FloodW. This code is a fast tool for the simulation and the analysis of the effects of flooding water on ship dynamics and loads in time domain, developed for safety purposes. It has been recently involved in the international benchmark study on simulation of flooding and motions of damaged Ropax vessels within the EU Horizon 2020 project FLARE, where the name FloodW was given for the first time. Indeed, the development of the code started almost 10 years ago for still water applications, limited to ship motions, up to flooding simulation in regular waves with the possibility to study also non-linear hull girder loads. The core feature of the flooding water modeling is in the assumption of a free surface normal to the apparent gravity vector, which is evaluated accounting for ship and water dynamics. Although this approach, from validations with experimental data, was found accurate in the whole range of filling levels of the damaged compartment, with finer accuracy for intermediate fillings, an alternative method was also proposed and implemented, pertinent to low filling levels. Therefore, this paper provides a comprehensive description of the FloodW code together with its applications, including also the recent developments in participating to the benchmark FLARE, regarding ship flooding in irregular wave scenario.

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Section: Lumped Mass Model Based On the Apparent Gravity Methodsmentioning

confidence: 99%

Section: Lumped Mass Model Based On the Apparent Gravity Methodsmentioning

confidence: 99%