Three-dimensional modeling of wave interaction with Marine Structures MOTIOM  (MOdelado Tridimensional de la Interacción del oleaje con Obras Marítimas )

MOTIOM project (BIA2008 - 05462 ) has been developed in 2009-2011 within the Spanish National Research Plan (DO) .

The main objective of MOTIOM has been to improve the
three-dimensional modeling knowledge and capabilities of the processes carried out by the waves in the presence of coastal structures. Traditional analysis of these structures has been carried out experimentally, mainly using two-dimensional models, with the problems which arise in this type of experiemtns such as scale effects and the inability to reproduce natural conditions which occur under the maritime works. The methodology used in this project, which applies three-dimensional modeling of the Navier- Stokes equations and experimental data, has allowed the three-dimensional study of the processes generated by the waves surrounding coastal structures.

The method has been divided into two parts. Initially
the Navier-Stokes equations have been derived to model the flow in porous media, such as riprap protections or breakwaters, and aresolution system coupledwith the flow outside othe structure has been presented. The proposed method consists of the joint resolution of the pressure and velocity fields in both areas of the domain. Likewise, two turbulence models have been adapted, the k-e and the SST model, for flow in porous media. In the second phase of the project we have developed new algorithms to improve the generation of realistic wave conditions using RANS models. TO carry out this phase multidirectional wave algorithms of  short and long crested waves as well as for the waveve absortion have been developed. This has allowed for the reduction of the computational time , once one of the shortcomings of this type of models and their application to real case studies.

The new set of equations developed and the multi-directional generation-absortion numerical models have been validated in laboratory tests specifically designed for the project as well as other experiments found in the literature, obtaining a high degree of agreement between the measured variables and simulated. The tests were performed using vertical dike geometries and
rubble mound breakwaters, focusing on the analysis of processes such as over-topping, in which the wave conditions are mostly three dimensional, and the flow around breakwater nose.

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