CFD study on hydrodynamic of a boat with a tunnel stern
Abstract
Tunnels in the hull of a boat are one of the ways to improve the hydrodynamic characteristics. This paper presents the results of numeral modelling of the hydrodynamics of a boat with a tunnel in the stern part of the bottom. The diameter of the tunnels was D=250mm, D=375mm and D=420mm. Boat moving at speeds from 10 m/sec to 22 m/sec, which corresponds to the range of Froude number raging from 2.080 to 4.597 in the transient mode and stable planing mode. The parameters of numerical modelling, including computational grid, turbulence model, etc., were established on the ground of comparison with the results of the model experiments, which showed good agreement. As a result of numerical modelling, it was found that the appearance of tunnels leads to a decrease in draft and trim angle, but at the same time leads to an increase in drag. The best values of the hydrodynamic characteristics were achieved for the tunnel D=375mm. It has been noted, that the tunnel produces higher waves than a vessel without a tunnel which can be used for water sports. The use of tunnels requires careful consideration of all hydrodynamic properties of a planning boat's hull.
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