Abstract
The 2D impact phenomenon in calm water, considering asymmetric entry and asymmetric entry withhorizontal velocity is studied. The analysis was performed by using a commercial CFD software (STARCCM+©). The results obtained from the simulations are: pressure distribution, force and roll moment.The study was carried out for typical planing boat sections. Furthermore, the critical conditions requiredfor flow separation from the keel are also determined. The results are compared with models and resultsobtained from some authors and they present very good agreement.
Highlights
The 2D impact phenomenon in calm water, considering asymmetric entry and asymmetric entry with horizontal velocity is studied
The 2D impact phenomenon has been studied through the application of added mass theory, boundary valued problems, and CFD applications
The boundary conditions considered for modeling the asymmetric entry are: constant atmospheric pressure at the top boundary, velocity entry on the base and vertical boundaries, and wall at the hull
Summary
Vorus (1996) studied the 2D impact with symmetric entry for a section with variable dead rise angle, solving the problem as a boundary value problem, assuming potential flow. Wagner (1932) applied added mass theory to obtain the lift force in a wedge section, as presented in Fig.. He evaluated the pressure distribution assuming potential flow and applying energy conservation. Tveitnes (2001) studied the impact applying added mass theory He calculated the lift force and concluded that the hydrodynamic force experienced by a wedge section under symmetric entry and constant velocity entry, is generated by the variation of mass and flow moment. Caponnetto et al, (2003) generalized the impact for symmetric entry
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