Violent fluid-structure impacts solved through a Delta-SPH

The diffusive weakly-compressible SPH scheme described in Antuono et al.[1] (hereinafter denoted as Delta-SPH model) has been challenged in the analysis of impacts against structures generated by dam-break flows. Specifically, the 3D SPHERIC benchmarks number 1 and 2 have been studied as well as a novel 2D test case characterized by complex solid boundary profiles. In all the test cases the solid boundaries have been modelled through the boundary particle technique described in Colagrossi et al.[2] and a free-slip condition has been imposed along the solid profiles. For the SPHERIC benchmarks, the numerical results have been validated through comparison with the experimental data already available in the literature. Conversely, the new test case has been compared with the numerical results obtained through a Navier-Stokes Level-Set scheme. Finally, a brief insight on viscous effects has been provided for the latter test case. All test cases proved that the Delta-SPH scheme with the boundary particle technique is an accurate and robust solver for the prediction of the global fluid evolution and the local loads against structures.