Investigation of hull-waterjet flow interaction

Turnock, S.R., Hughes, A.W., Moss, R. and Molland, A.F. (1997) Investigation of hull-waterjet flow interaction. Baird, Neil and Jeffs, Andrew (eds.) In FAST'97 / fourth International Conference on Fast Sea Transportation, Sydney, Australia, July 21-23, 1997. Baird Publications. pp. 51-58 .

Abstract

A comparison of reliable experimental data with the prediction of a CFD package for the flow over and through the upstream hull and inlet duct of a waterjet geometry has been carried out. The flow solver algorithm used is based the incompressible, three-dimensional Reynolds averaged Navier Stokes equations for turbulent flow with a k-e turbulence model. A detailed series of wind tunnel tests of a representative water jet geometry have been carried out for a range of duct exit velocity to shipspeed ratios. Detailed surface pressure measurements at 85 locations and measurements using a pitot traverse of velocity profiles within the duct were obtained. The complex geometry of the waterjet duct and hull interface required the use of a multi-block grid generator to produce a computational mesh of the waterjet inlet duct and wind tunnel working section which represented the ship hull. Solutions were obtained from comparable conditions to those tested. It was found that both the surface pressure variations and velocity profiles around and along the duct were well predicted as was the influence of operating condition. The differences were principally attributable to the lack of grid resolution for the boundary layers and in areas of rapidly changing curvature. The potential of the flow solver to obtain accurate solutions was demonstrated. This allows the prediction of the total force distribution, surface pressure and shear stress, on both the hull surface in the vicinity of the duct and the inlet duct itself.

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Contributors

Author: S.R. Turnock

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