Numéro : 2814 - Year : 2025
Development and analysis of a CFD-RANSE method for estimating the added resistance in waves: validation and application to bow shape optimisation
Mathieu KERGOAT, Antoine PAGES, Maïté GOUIN - SIREHNA – Modélisation-Simulation-Hydrodynamique – Bouguenais (France) - Pierre-Emmanuel GUILLERM - Naval Group SA – Service Hydrodynamique – Lorient (France)
Ship’s resistance and powering performance are nowadays well-known topics. Meanwhile, the waves contribution on the ship resistance, although crucial for the hydrodynamics engineer and naval architect, is a challenging topic with still ongoing research. The Added Resistance in Waves is usually estimated by potential-flow-based methodologies and compared to model tests. Even though this approach is sufficient for most cases, it suffers from limitations (precision, costs), so that CFD- RANS computations become relevant to ensure more accurate results for the ship design process. A foreseen application is the ranking of bow shapes with respect to their calm-water and in-waves resistance. This subject of frequent interrogations is addressed by this article. First, a CFD-RANS approach to compute the flow around the ship in regular waves is described. The methodology is verified and validated with respect to model tests and potential-flow computations on a benchmark hull form (DTMB 5512) and a reference hull form, similar to the hull forms of interest for Naval Group. Then, eleven geometric variations of this reference ship bow are designed and their performance are evaluated numerically. The CFD-RANSE simulations allow to assess the calm water resistance and the added resistance in waves, as well as the vertical motions of the ship in regular head waves. The results of this variation analysis highlight the necessary trade-off between calm-water and in-waves performances and the critical contribution of the bow to the total resistance. The approach discussed in this article is a relevant methodology for the improvement of hydrodynamic performances of ship hulls from the early design stages onwards.
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