Numerical Study Of Cavitation On A NACA0015 Hydrofoil: Solution Verification
Author Negrato, C., Lloyd, T., Terwisga, T.J.C. van, Vaz, G. and Bensow, R.
Title Numerical Study Of Cavitation On A NACA0015 Hydrofoil: Solution Verification
Conference/Journal VII International Conference on Computational Methods in Marine Engineering (MARINE2017), Nantes, France
Month May
Year 2017
Pages 157-168

Abstract
The present paper analyses a series of Computational Fluid Dynamic simulations
of the cavitating flow around a two-dimensional NACA0015 foil. The foil is placed at 6° angle
of attack and the cavitation number is 1.1. Two mesh designs, namely a block-structured
topology and an unstructured topology, are compared; additionally, grid refinements and time
step refinements are carried out. Solution Verification is addressed with calculation of the
discretization error and the numerical uncertainty. The numerical uncertainty for the average
lift coefficient is found to be large, up to 15%. The reason is the difficulty of achieving a grid
independent solution: with very fine meshes, the flow shifts from an attached, oscillating sheet
cavity pattern to a regime dominated by shedding of cavity clouds. On the other hand, neither
the time resolution nor the choice of grid topology influence largely the flow pattern; instead,
they only lead to differences in the maximum and minimum cavity size.

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