A Numerical Study of Submarine Propeller-Hull Interactions

摘要

The aim of this paper is to describe a recently devel-oped computational methodology, based on Large Eddy Simulations (LES), for handling the flow and flow induced noise around fully appended submarin-es and surface ship; In this particular investigation the method is applied to a generic submarine hull, the DARPA AFF8 hull, together with the seven bladed INSEAN E1619 propeller. The computational meth-odology developed for the propeller-hull interactions is based on a deformation and regeneration technique in which different static grids are coupled together using one or more dynamic grids that areregenerated when their quality has degenerated too much due to the motion. As flow induced noise and particularly the flow-induced noise from the propeller are impor-tant parts of the passive acoustic signature of a sub-marine, the methodology is coupled to a hydroacous-tic model based on Lighthill's theory. In this paper the computational model is described in detail and a number of validation cases are presented to quantify the accuracy and usefulness of the method. Both ca-nonical and applied validation cases are discussed". The results of the model, when, applied to the com-bined DARPA AFF8 hull and INSEAN E1619 pro-peller configuration is finally discussed to further elu-cidate the generic flow and acoustic features of a ful-ly appended submarine.