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IJSCT 128

Paper Title: Steady-state calculations of free surface flow around ship hulls and resistance predictions

 

Authors

A Pranzitelli, University of Leeds, UK
C de Nicola and S Miranda, Università di Napoli Federico II, Italy 

Summary

This study numerically simulated the free-surface flow around a semi-displacing motoryacht advancing steadily in calm water, recurring to two approaches implemented in two commercial software packages. The volume of fluid (VOF) method implemented in a Reynolds-averaged Navier-Stokes (RANS) equations solver and a panel method with free-surface capabilities were employed. Both methods were assessed on the Wigley parabolic hull and the Series 60, CB=0.6 hull.
Particular importance was attached to the grid topology for the RANS simulation to minimize computational efforts without any lack of accuracy of the numerical solution. Indeed, all the computations presented here were carried out on a dual core single processor personal computer avoiding expensive hardware. Numerical results were finally compared with existing experimental data.
The VOF method correctly predicted both the free-surface shape and the total resistance, while the panel method showed its shortcomings in simulating complex wave shapes typically generated around semi-displacing hulls. The validation results suggest also a strong dependency of the simulation on the trim of the hull. 

Reference

Transactions RINA, Vol 154, Part B2, International Journal of Small Craft Technology, Jul-Dec 2012 

DOI number

DOI No: 10.3940/rina.ijsct.2012.b2.128 

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