RANSE Simulations of a Naval Combatant in Head Waves

Patrick Queutey; Michel Visonneau; Alban Leroyer; Ganbo Deng; Emmanuel Guilmineau

Patrick Queutey Ecole Centrale de Nantes
Michel Visonneau Ecole Centrale de Nantes
Alban Leroyer Ecole Centrale de Nantes
Ganbo Deng Ecole Centrale de Nantes
Emmanuel Guilmineau Ecole Centrale de Nantes

Keywords: numerical simulation, RANSE, turbulence, fixed and free ship in waves.

Abstract

The paper presents a set of viscous computations for a fixed or free pitch and heave surface combatant David-Taylor model basin (DTMB 5512) advancing in head waves. A detailed comparison on the forces coefficients, the phase-averaged free-surface elevations when available, between simulation and experiments will be shown for the fixed ship at moderate (Fr=0.28) and high (Fr=0.41) Froude number, demonstrating an excellent agreement. With a unique viscous computational tool, it will be proved that it is possible to compute implicitly radiated and diffracted waves. Even for the medium speed test case (Fr=0.28), the computational results demonstrate that the radiated bow and stern waves associated with the heave and pitch of the ship can not be neglected.

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