The time-dependent cavitating flow around a hydrofoil has been simulated
by a pressure-based method and finite volume approach in framework
of the Favre-averaged equations. Results from a transport equation-based
cavitation model are compared with those obtained by alternate modeling
strategies to gauge the modeling implications in the prediction.
Furthermore, both the Launder and Spalding version and a recently
developed filterbased modification of the k - e model have been employed.
In addition to presenting the instantaneous and time averaged results,
salient flow structures have been distilled using Proper Orthogonal
Decomposition (POD). The filter-based turbulence model, which significantly
reduces viscous damping, leads to stronger time-dependency in flow
structures, dynamic parameters such as lift coefficient, and cavity
shape. The POD analysis shows that the solutions yielded by different
turbulence and cavitation models share similar major modes for s
= 0.8, but noticeably different structures for the massively cavitating
case, s = 0.4.
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