Improved Modelling Of Sheet Cavitation Dynamics On Delft Twistll Hydrofoil
Author Vaz, G., Lloyd, T. and Gnanasundaram, A.
Title Improved Modelling Of Sheet Cavitation Dynamics On Delft Twistll Hydrofoil
Conference/Journal VII International Conference on Computational Methods in Marine Engineering (MARINE2017), Nantes, France
Month May
Year 2017
Pages 143-156

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 uncertainties
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.

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