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Special Seminar: Effect of Compressibility on Shedding Dynamics of Cavitating Bubbly Flows

Harish Ganesh

11:00 AM on 2019-03-20

Akerman 215


Abstract: Cavitating bubbly flows can occur in separated flows and shear layers leading to local regions high vapor void fraction. Under certain conditions, for attached partial cavities, periodic shedding of vaporous clouds can occur. Historically, the presence of a liquid re-entrant flow, driven by the kinematics of liquid flow stagnation, has been identified as an important mechanism leading to cavity shedding for attached partial cavities. Recent findings indicate that high local vapor void fractions can also result in a reduced mixture speed of sound and locally supersonic flow. Under such conditions when the local speed of sound is very low, propagating bubbly shocks can be the dominant mechanism of shedding of vaporous clouds. This hindsight has resulted in exploring the effect of compressibility on cavitation shedding dynamics in a broader context. In this presentation, the effect of compressibility on cavitation dynamics on four different geometries, mainly in the generation and the importance of propagating bubbly shocks, are discussed. To elucidate the differences and similarities, observations from a backward facing step, backward facing wedge, NACA0015 hydrofoil, and a bluff body with a wedge cross section are discussed.


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