Session: 08-02-02 Ship & Floating Systems

Paper Number: 105049

105049 - Preliminary Investigation Into the Dynamic of Planing Hulls in Regular Waves Using the Smoothed Particle Hydrodynamics Method 

The motion of planing hulls in waves is difficult to capture with empirical or analytical models, due to large wave-induced dynamic responses and vertical accelerations, which often resolve into unsteady responses. Towing tank tests still form the basis for studying these systems, but the support of numerical and semi-analytic methods is always utilized to enhance the readability of the experimental data. The support of Computational Fluid Dynamics (CFD) methods, in which the governing equations of fluid flow are discretized and solved in the time domain, has been used for studying the complex interaction between hull and fluid, and numerical modeling procedures for assessing the performance of planing hulls are becoming more reliable still. This work aims to assess the capability of the Smoothed Particle Hydrodynamics (SPH) meshless method to numerically solve the flow around the C2 planing hull of the Naples warped planing hull Systematic Series, under regular waves conditions. The heave and pitch motions are evaluated for a wide range of Froude’s numbers and framed within the experimental dataset.

The SPH formulation employed for this research is implemented into the DualSPHysics [1] solver, widely recognized among the most reliable open-source SPH-based codes. It boasts, moreover, an embedded interface to solve kinematic restrictions and multibody dynamics via Project Chrono; the latter multiphysics library is used to simulate the mechanical features of the towing facility. The numerical wave flume is ad-hoc developed, leveraging open boundaries conditions, to reproduce a second order waves-current interaction. To neglect, in fact, the non-linear interaction between a following current and the superposed waves, leads to incorrect estimations of the wave characteristics, invalidating the wave propagation even for advanced CFD simulations. Therefore, the flow velocity field, along with the free surface elevation, drawn from a velocity potential which accounts for the presence of a steady current, are imposed as inlet boundary conditions. The use of a relaxation zone allows the complete absorption of the perturbations caused by the fluid-hull interaction, guaranteeing the absence of flow reflection at the outlet boundary. As the longitudinal dimension of the numerical wave tank can be limited to two wavelengths, relatively limited computational effort is required. Moreover, the accurate description of wave-current would be a major advantage when joined with the capability of the SPH method to simulate complex free surface flows and moving floating objects when applied to planing hull motion analysis. The present work, finally, will provide the first structured investigation on hull performance in an SPH framework, highlighting the suitability of the prosed numerical environment in addressing complex wave-hull interaction. 

[1] Domínguez, J.; Fourtakas, G.; Altomare, C.; Canelas, R.; Tafuni, A.; García Feal, O.; Martínez-Estévez, I.; Mokos, A.; Vacondio, R.; Crespo, A.; Rogers, B.; Stansby, P.; Gómez-Gesteira, M. DualSPHysics: from fluid dynamics to multiphysics problems. Computational Particle Mechanics (2022). doi:10.1007/s40571-021-00404-2.

Presenting Author: Salvatore Capasso Università degli Studi di Salerno

Presenting Author Biography: PhD student at the university of Salerno. Research interest in Fluid-Structure Interaction.

Authors:

Salvatore Capasso Università degli Studi di Salerno
Bonaventura Tagliafierro Universidad Politécnica de Cataluña - UPC BarcelonaTech
Simone Mancini Università degli Studi di Napoli Federico II
Fabio De Luca Università degli Studi di Napoli Federico II
Iván Martínez-Estévez EPhysLab - Universidade de Vigo
José Manuel Domínguez EPhysLab - Universidade de Vigo
Corrado Altomare Universidad Politécnica de Cataluña - UPC BarcelonaTech
Alejandro J.C. Crespo EPhysLab - Universidade de Vigo
Claudio Pensa Università degli Studi di Napoli Federico II
Giacomo Viccione Università degli Studi di Salerno