Numéro : 2081 - Year : 1989

Calculation of bulbous bows, an application of the REVA code

G. DELHOMMEAU, Docteur ès Sciences
J.MKOBUS, Maître de Conférence , Laboratoire d'Hydrodynamique Navale, ENSM,Nantes
J. J MAISONNEUVE, Ingénieur de recherche, SIREHNA, Nantes.

The optimization of a bulbous bow can be performed experimentally by a systematic variation of its main parameters (longitudinal location, depth and diameter).The variation of these parameters are choosen in a range compatible with the main others characteristics of the ship. Experiments are made for a great number of parameters sets.

Such trials have been run in the towing tank of the LHN of ENSM for a 24 meters long trawler model. The optimization of the bulb efficiency by such an experirnental procedure is tedious and very time consuming.

We propose here 10 use the same methodology but replacing experiments by calculations with REVA code. This code computes the flow around the hull using a RANKINE singularly method. The results of calculations are compared with experiments.

The influence of any modification of the hull is easily obtained by the method. Fur1hermore. additional Information such wave pat1ern. stream Line and local pressures are gained.

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