The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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A COMPARISON STUDY OF DIFFERENT CAVITATION MODELS ON THE DEVELOPMENT OF 2D CAVITATING FLOWS


Go-down ichd2016 Tracking Number 112

Presentation:
Session: Cavitation and cavitating flows II
Room: Room 4
Session start: 16:00 Tue 20 Sep 2016

Shuo-Ting Chiang   positiveman03@yahoo.com.tw
Affifliation: National Taiwan Ocean University

Jiahn-Horng Chen   jhcntou@gmail.com
Affifliation: National Taiwan Ocean University


Topics: - Cavitation and cavitating flows

Abstract:

Flow cavitation has been a vital, yet complicated, phenomenon in many engineering applications. Various cavitation models have been proposed in the past few decades. Roughly speaking, they can be divided into three main categories: interface tracking models, density-pressure coupling models, and transport models for liquid/mass fraction [1]. Among them, the type of models in the last category appears to be the most popular one in numerical simulations since the first one is difficult to take care of the detached cavity and the second one does not have the capability to couple with the transport phenomenon. In the present study, three mixture models are employed for computing the cavitating flow phenomena in several 2-D hydrofoils. The three models were developed by Singhal et al. [2], Zwart el al. [3], and Schnerr & Sauer[4], respectively. the first model accounts for various first-order effects including phase change, bubble dynamics, turbulent pressure fluctuations, and noncondensable gases [2]; the second one proposes that the total interphase mass transfer rate per unit volume is determined by the bubble density numbers and the mass change rate of a single bubble [3]; the last one suggests a new formulation of mass transfer rate and is able to simulate the cyclic formation of cavitation cloud, the formation of re-entrant jet, and so on [4]. In the study, some 2-D typical hydrofoil sections are employed for investigation. For each case, the cavitating flow is carefully computed. Then, the cavitation characteristics, such as its size, location, and physical properties, are then compared. The vortical flow development is also examined. Finally, some features on the cavitation simulation using these models are concluded. REFERENCES [1] C.-C Tseng, Modeling of Turbulent Cavitating Flows, Ph.D. dissertation, University of Michigan, 2010. [2] A.K. Singhal, M.M. Athavale, H. Li and Y. Jiang, “Mathematical basis and validation of the full cavitation model,” J. Fluids. Eng., Vol. 124, pp. 617-624 (2002). [3] P.J. Zwart, A.G. Gerber, and T. Belamri, “A two-phase flow model for predicting cavitation dynamics,” 5th Int. Conf. Multiphase Flow, Yokohama, Japan (2004). [4] G.H. Schnerr and J. Sauer, “Physical and numerical modeling of unsteady cavitation dynamics,” 4th Int. Conf. on Multiphase Flow, New Orleans, USA (2001).