Time-domain Analysis Of The Hydroelastic
Response Of Cavitating Propulsors
Author(s)
Y. L. Young
Abstract
A 3-D boundary element method (BEM) is coupled with a 3-D finite element
method (FEM) to model the hydroelastic response of cavitating propulsors.
The BEM is applied to evaluate the moving cavity boundaries and hydrodynamic
forces, as well as the added mass and hydrodynamic damping matrices. The FEM
is applied to evaluate the dynamic blade stresses and deformations. The effects
of fluid-structure interaction are included by superimposing the added mass and
hydrodynamic damping matrices to the material mass and damping matrices in
the equilibrium equation of motion. The problem is solved in the time-domain
using an implicit time integration scheme. An overview of the formulation is
presented along with numerical and experiment validation studies. The effects of
fluid-structure interaction and cavitation on the propeller performance are
discussed.
Keywords: fluid-structure interaction, hydroelastic, cavitation, propeller.
1 Introduction
Since the pioneering works of [1, 2, 3, 4], boundary element methods (BEMs)
have been widely used for the analysis of complex flows around propellers. Most
recently, a perturbation potential-based BEM developed by [2, 3, 5, 6, 7] has been
further extended to predict unsteady cavitating and ventilated flows for conventional
fully submerged propellers [8, 9], supercavitating propellers [10, 11, 12],
and surface-piercing propellers [11, 13]. For cases without blade vibration, the
developed BEM has been shown to predict forces and cavitation patterns that
compared well with experimental measurements. However, hydroelastic effects
become important for non-conventional propeller geometries (e.g. highly skewed
Keywords
fluid-structure interaction, hydroelastic, cavitation, propeller.
Related Book
Other papers in this volume
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