Group Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Title: 2.1.2 - LES-Based Bubble Tracking Simulation of Turbulent Cavitation Flow in Injector Nozzle
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Permanent Link: http://ufdc.ufl.edu/UF00102023/00039
 Material Information
Title: 2.1.2 - LES-Based Bubble Tracking Simulation of Turbulent Cavitation Flow in Injector Nozzle Cavitation
Series Title: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings
Physical Description: Conference Papers
Creator: Sou, A.
Goshima, D.
Kinugasa, T.
Hayashi, K.
Tomiyama, A.
Publisher: International Conference on Multiphase Flow (ICMF)
Publication Date: June 4, 2010
 Subjects
Subject: injector
turbulent flow
cavitation
LES
atomization
Rayleigh-Plesset equation
 Notes
Abstract: Atomization of a liquid jet discharged through a nozzle of an injector is strongly affected by cavitation in the nozzle. A number of numerical simulations of the internal cavitating flow have been carried out. Most of those simulations are, however, based on the RANS turbulent model and the homogeneous two-phase cavitation model, which cannot accurately predict the transient cavitation consisting of cavitation film and bubble clouds. As a step to develop a hybrid model which can accurately treat the film, clouds, turbulence in the nozzle and breakup of a liquid jet, a combination of Large Eddy Simulation (LES), one-way Bubble Tracking Method (BTM), and the Rayleigh-Plesset (R-P) equation is constructed to simulate incipient and developing cavitations, which consist of tiny cavitation bubbles. A precursor simulation of a fully-developed turbulent flow in a periodic channel is carried out to generate inlet boundary condition for the nozzle simulation. To validate the model, motion of cavitation bubbles and turbulent velocity in a rectangular nozzle are acquired by using a high-speed camera and Laser Doppler Velocimetry (LDV). A recirculation flow and vortex shedding are reproduced by LES, and the motion of cavitation is well simulated by solving the R-P equation for all the nuclei tracked in a Lagrangian manner. Simulations also confirm that both Smagorinsky and Vreman's subgrid-scale (SGS) models give good predictions for turbulent flows in the nozzle. Sensitivity analyses show that the effects of the SGS pressure variation and viscous stress on bubble dynamics (R-P eq.) are not significant.
General Note: The International Conference on Multiphase Flow (ICMF) first was held in Tsukuba, Japan in 1991 and the second ICMF took place in Kyoto, Japan in 1995. During this conference, it was decided to establish an International Governing Board which oversees the major aspects of the conference and makes decisions about future conference locations. Due to the great importance of the field, it was furthermore decided to hold the conference every three years successively in Asia including Australia, Europe including Africa, Russia and the Near East and America. Hence, ICMF 1998 was held in Lyon, France, ICMF 2001 in New Orleans, USA, ICMF 2004 in Yokohama, Japan, and ICMF 2007 in Leipzig, Germany. ICMF-2010 is devoted to all aspects of Multiphase Flow. Researchers from all over the world gathered in order to introduce their recent advances in the field and thereby promote the exchange of new ideas, results and techniques. The conference is a key event in Multiphase Flow and supports the advancement of science in this very important field. The major research topics relevant for the conference are as follows: Bio-Fluid Dynamics; Boiling; Bubbly Flows; Cavitation; Colloidal and Suspension Dynamics; Collision, Agglomeration and Breakup; Computational Techniques for Multiphase Flows; Droplet Flows; Environmental and Geophysical Flows; Experimental Methods for Multiphase Flows; Fluidized and Circulating Fluidized Beds; Fluid Structure Interactions; Granular Media; Industrial Applications; Instabilities; Interfacial Flows; Micro and Nano-Scale Multiphase Flows; Microgravity in Two-Phase Flow; Multiphase Flows with Heat and Mass Transfer; Non-Newtonian Multiphase Flows; Particle-Laden Flows; Particle, Bubble and Drop Dynamics; Reactive Multiphase Flows
 Record Information
Bibliographic ID: UF00102023
Volume ID: VID00039
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: 212-Sou-ICMF2010.pdf

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