Cavitation Flow Analysis of Axisymmetric Bodies Moving in the Water

This study aims to analyze the turbulent cavitating flow on the axisymmetric bodies moving in the water by using the incompressible two phase flow calculation. A program is developed with a pressure based SIMPLE algorithm and k-

ε

turbulent model implemented by wall function. A volume of fraction(VOF) method is used to capture the boundary between fluid and gas phase and the model for bubble production and depletion is also modeled and applied to represent the cavitation phenomena. SIMPLE algorithm is extended to simulate the compressible flow as well as two phase flow. Comparisons of calculation results show very good agreement with previous studies and verify the code validity. For a projectile with a hemispherical head form at the cavitation number(

σ

) of 0.4, the pressure coefficient Cp agrees pretty well with previous results by Shyy et al. Also another calculation with conical head form at

σ

=0.5 provides a good agreement with the results by Kunz et al. After the validation study, effect of cavitation on drag force is investigated. The drag force coefficient on the surface increases at the condition of cavitation.