Numerical Study of Cavitation on a NACA0015 Hydrofoil: Solution Verification
Paper i proceeding, 2017

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.

NACA0015 foil

Verification

Discretization Error

RANS

Cavitation

Författare

Carlo Negrato

Chalmers, Sjöfart och marin teknik, Marin teknik

Thomas Lloyd

Maritime Research Institute Netherlands (MARIN)

Tom van Terwisga

Maritime Research Institute Netherlands (MARIN)

Guilherme Vaz

Maritime Research Institute Netherlands (MARIN)

Rickard Bensow

Chalmers, Sjöfart och marin teknik, Marin teknik

7th International Conference on Computational Methods in Marine Engineering, MARINE 2017

Vol. 2017-May 157-168

7th International Conference on Computational Methods in Marine Engineering, MARINE 2017
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