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Numerical Study of Cavitation on a NACA0015 Hydrofoil: Solution Verification

Carlo Negrato (Institutionen för sjöfart och marin teknik, Marin teknik) ; Thomas Lloyd ; Tom van Terwisga ; Guilherme Vaz ; Rickard Bensow ( Institutionen för mekanik och maritima vetenskaper, Marin teknik)
VII International Conference on Computational Methods in Marine Engineering, MARINE 2017 (2017)
[Konferensbidrag, övrigt]

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.

Nyckelord: Cavitation, Verification, NACA0015 foil, RANS, Discretization Error



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Denna post skapades 2017-08-14.
CPL Pubid: 251089

 

Institutioner (Chalmers)

Institutionen för sjöfart och marin teknik, Marin teknik (2015-2017)
Institutionen för mekanik och maritima vetenskaper, Marin teknik

Ämnesområden

Energi
Transport
Hållbar utveckling
Numerisk analys
Farkostteknik

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)