Fully 3D ship hydroelasticity: Monolithic versus partitioned strategies for tight coupling

High Fidelity Hydroelastic Analysis Using Modal Matrix Reduction

“…Since SeaFEM is based on the FEM, the mesh used for the wet body boundary condition might have the same or similar discretization to the structural mesh to ensure no loss of accuracy for local modes. In those cases where the local modes are not excited, different mesh discretization can be used with no interpolation issues, as reported in [18]. As shown in the application example of this work, no modal converges issues have been detected when using the approximation presented here.…”

“…In [18], it was concluded that the three-dimensional fully coupled hydroelastic problem in the time-domain is very expensive computationally speaking, and most of the computational work is taken by the structural solver. Hence, in this work, a modal order reduction is proposed for the structural problem, aiming at reducing the computational cost of fully coupled simulations.…”

“…One of the most recent works in hydroelasticity using potential flow for seakeeping hydrodynamics was published by the present authors in [18]. In that work, a tightly coupled hydroelastic model was developed within SeaFEM (a time-domain wave diffractionradiation solver based on FEM [19][20][21]).…”

“…In any case, the computational cost is still too high and is mostly taken by the structural dynamics solver. The governing equations of the hydroelastic problem are those of the wave diffraction-radiation problem in the time domain, along with the linear structural equations solved with FEM [18]. The coupling is carried out at the wet surface of the floater, where the seakeeping hydrodynamics solver (SeaFEM) sends pressure values to the structural solver, and the latter sends back the structural displacements on the same surface.…”

“…The present work can be seen as an evolution of [18] to reduce the computational time of the structural solver (which is the dominant one). This reduction is achieved by projecting the high-fidelity structural solution onto the modal basis to obtain the modal matrix system.…”