Improved modelling of sheet cavitation dynamics on delft twist11 hydrofoil
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/330625
Tipus de documentText en actes de congrés
Data publicació2017
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
In this paper, unsteady viscous-flow cavitation predictions for a 3D hydrofoil are performed using three different approaches: 1) a pure RANS method; 2) a RANS method including an
eddy-viscosity “Reboud” correction; 3) a DDES Scale-Resolving-Simulation approach. Both wetted and
cavitating flow conditions are analysed and compared with experimental data. The accuracy of
these approaches is scrutinised in terms of integral quantities, cavity dynamics,
different background principles, and the influence of grid refinement. Low numerical
uncer- tainties have been obtained for wetted flow conditions, but a somewhat large deviation on
the wing loading has been observed when compared with experimental results. For the cavitating
flow case, the RANS calculations do not accurately simulate the cavity dynamics. The RANS- Reboud
correction improves the fidelity of the calculations at increased numerical demands and decreased
robustness. The DDES approach leads to improved dynamics, slightly less accurate cavity shedding
mechanism, at lower computational cost. The cavity extents are underpredicted for all methods and
conditions used, when compared with the available experimental data.
CitacióVaz, G.; Lloyd, T.; Gnanasundaram, A. Improved modelling of sheet cavitation dynamics on delft twist11 hydrofoil. A: MARINE VII. "MARINE VII : proceedings of the VII International Conference on Computational Methods in Marine Engineering". CIMNE, 2017, p. 143-156. ISBN 978-84-946909-8-3.
ISBN978-84-946909-8-3
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Marine-2017-10_Improving modelling of sheet.pdf | 6,940Mb | Visualitza/Obre |