Numéro : 2009 - Year : 1986

Calculation of three-dimensional unsteady flows around lifting surfaces and application on marine propellers.

A.GREKAS, Docteur-Ingénieur Ingénieur projets, ALSTHOM, Ets Nantes ACB
B.CANTALOUBE, Ingénieur, ONERA

Alsthom Establishment de Nantes ACB have for the past year been undertaking a major applied research programme in the l1omain of naval hydrodynamics. This programme primarily concerns the development of a better and deeper understanding of the intricacies o-f flows around marine bodies and in particular marine proposes; the optimisation of propeuer design being the final objective of the programme.

In this paper we present the numerical method used for studying three-dimensional unsteady flows of perfect incompressible fuids past lifting surfaces. The method is an extension of the vortex particle method developed by C.REHBACH. The lifting surfaces are modelled by a superficial distribution of normal doublets, the vortex sheets are modelled by a number of vortex carrying particles. The time and space evolutions of these point vortices are studied by numerical simulation.

Some calculation examples for a flat plate under various bolder conditions and for a typical propeuer are presented at the end of this paper.

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