Sensitivity Evaluation of a Transport-Based Turbulent Cavitation Model

Rajkumar Vaidyanathan, Inanc Senocak, Jiongyang Wu, Wei Shyy
2002 32nd AIAA Fluid Dynamics Conference and Exhibit   unpublished
A sensitivity analysis is done for turbulent cavitating flows using a pressure-based Navier-Stokes solver coupled with a phase volume fraction transport model and non-equilibrium k-ε turbulence closure. Four modeling parameters are adopted for evaluation, namely, C ε1 and C ε2 , which directly influences the production and dissipation of turbulence kinetic energy, and C dest and C prod , which regulate the evaporation and condensation of the phases. Response surface methodology along with
more » ... of experiments is used for the sensitivity studies. The difference between the computational and experimental results is used to judge the model fidelity. Under non-cavitating conditions, the best selections of C ε1 and C ε2 , exhibit a linear combination with multiple optima. Using this information, cavitating flows around an axi-symmetric geometry with a hemispherical fore-body and the NACA66(MOD) airfoil are assessed. Analysis of the cavitating model shows that the favorable combinations of C dest and C prod , are inversely proportional to each other for the geometries considered. A set of cavitation numbers is selected for each of the geometries to demonstrate the predictive capability of the present modeling approach for attached, turbulent cavitating flows.
doi:10.2514/6.2002-3184 fatcat:cyovlf6mjjardcxhyiizh7k7lq