Abstract
The hydrodynamics performance of submerged and surface-piercing lifting bodies is analyzed by a potential flow model based on a Vortex Lattice Method (VLM). Such a numerical scheme, widely applied in aerodynamics, is particularly suitable to model the lifting effects thanks to the vortex distribution used to discretize the boundaries of the lifting bodies. The method has been developed with specific boundary conditions to account for the development of steady free surface wave patterns. Both submerged bodies, such as flat plates and hydrofoils, as well as planing hulls can be studied. The method is validated by comparison against available experimental data and other Computational Fluid Dynamic (CFD) results from Reynolds Averaged Navier Stokes (RANS) approaches. In all the analyzed cases, namely 2D and 3D flat plates, a NACA hydrofoil, planning flat plates and prismatic planing hulls, results have been found to be consistent with those taken as reference. The obtained hydrodynamic predictionsare discussed highlighting the advantages and the possible improvements of the developed approach.
Highlights
Design high performance floating and submerged vessels has always been a great challenge in hydrodynamics
Boundary Element Methods (BEM) relying on potential flow theory have been developed to solve related problems such as the performance of cavitating and supercavitating hydrofoils [4, 5, 6] or subcavitating hydrofoils interacting with a free surface [7] and are widely applied in design by optimization processes thanks to their inherent computational efficiency [8, 9]
The hydrodynamic problem of either submerged and surface-piercing lifting bodies has been solved in the framework of a potential flow theory
Summary
Design high performance floating and submerged vessels has always been a great challenge in hydrodynamics This is mainly related to the effects of the dynamic pressures on the lifting body that induce changes in their running attitudes and, to the interactions that arise with the water free surface. Such interactions on a side alter the pressure distribution on the body surface and, on the other side, produce waves that propagates in the far field downstream This hydrodynamic problem has been deeply studied both numerically and experimentally. Boundary Element Methods (BEM) relying on potential flow theory have been developed to solve related problems such as the performance of cavitating and supercavitating hydrofoils [4, 5, 6] or subcavitating hydrofoils interacting with a free surface [7] and are widely applied in design by optimization processes thanks to their inherent computational efficiency [8, 9]. The obtained results are compared with available experimental measurements and against results obtained from other computational methods
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