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Abstract
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In this paper, three-dimensional two phase turbulent free surface flow is
solved by an in-house code. The incompressible Reynolds average NavierStocks equations (RANS) with k-ε turbulence model are solved by the finite
volume method in the non-orthogonal curvilinear coordinates. For the
modeling of the free surface effect, Lagrangian propagation volume tracking
method (VOF-PLIC) is used. The code is validated solving two-phase
turbulent flow through the impact problem of a circular cylinder. Then, the
horizontal movement of a NACA standard wedge with 20 degree deadrise
angle is simulated. The flow field and generated waves is estimated with
different velocities. Numerical results of the average wetted lengths show
acceptable compatibilities with the available experimental data. In addition,
some modifications on the V-bottom are done to investigate the effect of the
keel curvature and deadrise angle on the hydrodynamic forces. In each cases
the ratio of the lift and drag coefficient to the conventional wedge with 20
degree deadrise angle is evaluated. It is depicted that the convex curvature
doubles the drag coefficient and has not any significant effect on the lift
coefficient. The results confirm that the deadrise angle reduction decreases the
needed engine power in take-off. However, this reduction has a destructive
effect at the time of landing.
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