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A Numerical Investigation of Unsteady Bubbly Cavitating Nozzle Flows

Preston, Al and Colonius, Tim and Brennen, Christopher E. (2000) A Numerical Investigation of Unsteady Bubbly Cavitating Nozzle Flows. In: ASME 2000 Fluids Engineering Division Summer Meeting, 11-15 June 2000, Boston, Massachusetts, USA.

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The effects of unsteady bubble dynamics on cavitating flow through a converging-diverging nozzle are investigated numerically. A continuum model that couples the Rayleigh-Plesset equation with the continuity and momentum equations is used to formulate unsteady, quasi-one-dimensional partial differential equations. These equations are solved numerically using a Lagrangian finite volume method. Special formulations are used at the boundary cells to allow Eulerian boundary conditions to be specified. Flow regimes studied include those where steady state solutions exist, and those where steady state solutions diverge at the so-called flashing instability. These latter flows consist of unsteady bubbly shock waves travelling downstream in the diverging section of the nozzle. The computations show reasonable agreement with an experiment that measures the spatial variation of pressure, velocity and void fraction for steady shockfree flows, and good agreement with an experiment that measures the shock position and throat pressure for flows with bubbly shocks.

Item Type:Conference or Workshop Item (Paper)
Colonius, Tim0000-0003-0326-3909
Record Number:CaltechAUTHORS:PREfedsm00
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:136
Deposited By: Christopher Brennen
Deposited On:19 Oct 2004
Last Modified:02 Oct 2019 22:17

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