Last modified: 2012-09-12
Abstract
The paper presents a selection of CFD investigations on ship and propeller hydrodynamics performed in the frame of an extensive benchmarking presently undertaken within the undergoing Project OpenSHIP - Highly reliable CFD simulations for the prediction of the hydrodynamic performance of the hull-propeller system with OpenSource software - co-financed by the ERDF - European Regional Development Fund - Friuli Venezia Giulia Region Operational Programme 2007 - 2013, in the Call for industrial research projects in the field of shipbuilding industry and pleasure yachts. The simulations are conducted with the software OpenFOAM®.
The wavy viscous flow induced by a foil at constant speeds underneath the free surface with an angle of attack of 5 degrees is presented first. The numerical results from VOF-RANSE simulations are systematically compared with experimental data from the literature in terms of free surface profile, forces and velocity profiles. This test case on a relatively simple geometric shape has been selected for the highly conservative nature of the generated 2D wave pattern, allowing a detailed analysis of the coupling between the flow solver and the free surface treatment in the perspective of its application to the more complex ship-shapes.
The double model test case on the KCS Kriso hull is then presented with comparisons between the numerical results obtained and the experimental data available from the Gotheborg workshop 2010 on the wake at the propeller disk. The investigation has been mainly focused on the grid generation by means of snappyHexMesh.
Finally the numerical predictions of the flow around the model scale propellers E779A and PPTC are presented. The comparison between simulations and experimental data in steady state regime and the preliminary results from unsteady simulations are shown.