Comparison of nonlinear one- and two-way FFSI methods for the prediction of the symmetric response of a containership in waves

Slamming and green water loads on a ship sailing in regular waves predicted by a coupled CFD–FEA approach

“…However, a critical drawback of the conventional linear hydroelasticity theories, when using 2D or 3D potential flow theory within a modal superposition framework and a beam or 3D structural finite element analysis (FEA) representation, is that they are not capable of capturing the nonlinearities involved in the fluid actions as a consequence of the assumptions involved (Hirdaris et al, 2014;Lakshmynarayanana and Hirdaris, 2020). Although different levels of nonlinear theories ranging from weakly nonlinear Froude-Krylov method , and a 3D transient free surface Green's function (Datta and Guedes Soares, 2020) to a strongly nonlinear body exact method (Singh and Sen, 2007), have been developed for ship hydroelastic analysis, some complex flow phenomena such as flow separation, water splash, wave breaking and viscous effects cannot be reproduced in the framework of potential flow method.…”

“…For example, Ma and Mahfuz (2012) developed a finite element tool for structural analysis of a composite multi-hull structure in a two-way coupling manner using the ANSYS Workbench platform. Lakshmynarayanana and Hirdaris (2020) and Lakshmynarayanana and Temarel (2020) developed both one-way and two-way Fluid Flexible Structure Interaction (FFSI) methods to study ship wave loads and hydroelastic responses using the commercial software of STAR-CCM+ and Abaqus. Shi et al (2019) investigated hydroelastic water-entry impact dynamics of elastic AUVs by LS-DYNA software based on the arbitrary Lagrangian-Eulerian (ALE) algorithm.…”

A Fully Coupled Time-Domain BEM-FEM Method for the Prediction of Symmetric Hydroelastic Responses of Ships with Forward Speed

“…Yet, comparisons between 2D time and frequency-domain techniques demonstrated that the effects of nonlinearities become particularly important at higher speeds and for ships with large flare [18]. Since the application of Reynolds-averaged Navier-Stokes computational fluid dynamics (RANS CFD) hydroelastic methods remains computationally time consuming (e.g., [19,20], potential flow time-domain hydroelastic methods remain preferable for the prediction of the influence of whipping and springing loads for ship design and assessment.…”

The effects of geometric detail on the vibratory responses of complex ship-like thin-walled structures

“…Hydroelasticity of ships, a term that describes the strong coupling between the hydrodynamic loads from the sea surface and the vibratory responses of the vessel, has become an increasingly important subject with ships growing longer and faster [1]. The area was introduced in the 1970s [2] and quickly evolved from 2D potential flow methods to 3D potential flow [3] and 3D RANS [4]. From a structural perspective, ships tend to be modelled as beams, due to their length being much larger than their other dimensions [5].…”