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PhD: MODIFIED ISPH METHOD FOR MODELING THE WAVES INTERACTION WITH THE COASTAL PROTECTION STRUCTURES
Du 1 octobre 2024 au 30 septembre 2027
Institut PPRIME, Poitiers, France
Contacts : anthony.beaudoin@univ-poitiers.fr
chloe.mimeau@cnam.fr
The coastline of Nouvelle Aquitaine region is not immune to erosion and submersion risks. The thunderstorms of 2023 served as reminders. Nouvelle Aquitaine region has undertaken a reflection on territorial planning and decided to fund the CORALI program, whose objective is to provide multidisciplinary scientific knowledge necessary for better predicting coastal changes and anticipating adaptations to erosion and coastal submersion. Within the CORALI program, CURIOSITY and M2N propose a PhD thesis on the numerical modeling of wave interaction with defense structures. The thesis will involve modifying Smooth Particle Hydrodynamics methods. Numerical simulations will provide corrections to empirical laws used to quantify the performance of defense structures, including reflection coefficient (wave transmission), crest height (wave run-up), overflow discharge (wave overtopping), and structure stability (wave pressure), by incorporating the characteristics of defense structures.
The modified ISPH will be tested through two benchmarks. The first benchmark involves dam break, allowing for the evaluation of the modified ISPH's ability to simulate the impact of a water sheet on a wall, a problem with significant deformations of the free surface. The benchmark is based on the classical experiment by Lobovsky et al. (2014). In this PhD thesis, experimental data will be provided by the research group IVS, conducting a similar experiment to Lobovsky et al., but focusing on defense structures (see Fig. 4 on the left). The second benchmark will rely on the doctoral work of (Milesi, 2019) at Ecole Centrale Marseille. A sloshing test in a tank filled with water, with a bottom covered by a porous material on a hexapod, was conducted to study the damping of sloshing induced by the porous material (see Fig. 4 on the right). The comparison between experimental and numerical results will validate the modified ISPH and its coupling with the penalization method.
The last year of the PhD thesis will be dedicated to an applied study of submersion in the Nouvelle Aquitaine region. Two types of submersions can be identified along the coastline of Nouvelle Aquitaine with a North/South division. In the North, submersion is caused by atmospheric surge (i.e. increase in sea level due to pressure drop) combined with swell (i.e. rippling motion agitating the sea without breaking waves). In these areas, submersion has significant ecological consequences in areas where biodiversity protection is crucial. On the other hand, submersion in the South of Nouvelle Aquitaine results more from breaking waves that impact and violently pass over protection structures, potentially leading to severe socio-economic consequences and population displacements. The choice of one or two workshop sites, characterized respectively by swell or breaking waves phenomena, will be guided by discussions with the physical and sociological research groups involved in the CORALI project.
Candidates must hold an engineering degree or a research master's degree in scientific computing and/or numerical fluid mechanics. Candidates are expected to have skills in computer programming (experience in high-performance computing would be highly appreciated) as well as in numerical analysis, particularly a good understanding of numerical methods and schemes for fluid mechanics.