The hydrodynamic flow around a yacht keel based on LES and DES

Mylonas, Dimitrios and Sayer, Philip (2012) The hydrodynamic flow around a yacht keel based on LES and DES. Ocean Engineering, 46. 18 - 32. ISSN 0029-8018

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Abstract

The work presented in this paper focuses on the CFD application of large eddy simulation (LES) and detached eddy simulation (DES) to the prediction of the flow around an International America's Cup Class yacht keel model. The simulations were performed using both methods on adapted unstructured grids. The model keel was developed by Chalmers University for experimental purposes, and is becoming widely used for validation of CFD codes in yacht hydrodynamics. Initial results obtained are compared and validated against existing experimental data from wind tunnels in terms of lift and drag coefficients measurements and wake flow observations. Two sub-grid scale models for LES and two turbulence models for DES are investigated and compared. Sensitivity to numerical parameters is also addressed. Overall, most of the findings agree well with the experimental values although error is high in some cases.