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An Experimental Investigation of Coherent Structures

Nov 03, 2020 · of the sheet cavity and revealed that the development of sheet cavitation results from the laminar separation and depends on the type of the separation bubble [10,11]. One of the important issues of study is on the closure region of the sheet cavity. Many experiments focused on the cavity detachment and cloud cavitation along sheet cavitation An Experimental Study of Unsteady Partial Cavitation J Feb 19, 2004 · Investigation of Unstable Sheet Cavitation an Cloud Cavitation Mechanisms, The Effect of Nose Radius on the Cavitation Inception Characteristics of Two-Dimensional Hydrofoils, Report 3813 of the Naval Ship Research and Development Center, Bethesda, MD. Spectral Characteristics of Sheet/Cloud Cavitation,

Cloud cavitation behaviour on a hydrofoil due to fluid

Cloud cavitation behaviour on a hydrofoil due to fluid-structure interaction Samuel Smith, James Venning, Dean Giosio, Paul Brandner, Bryce Pearce, e FSI characteristics of ow over a liing body can signif- caused by periodic shedding of sheet-cloud cavitation. In Figure. Cavitation about a NACA 0009 stainless steel Effects of air injection on the characteristics of Results are presented at a Reynolds number 9.33 × 10 5 and Froude number 10.24 for (1) under re-entrant flow mechanism ( = 0.81) characterized by the intermittent shedding of small-scale cavities, and (2) under bubbly shock propagation mechanism ( = 0.70) characterized by periodic large-scale cavity cloud shedding, with three non-dimensional air injection volumetric flow rates, namely 0, 1.135 × 10 Experimental and Numerical Investigation of Large Scale The periodic shedding of vortical clouds of bubbles into the wake is associated with lift oscillations, the amplitude of which can exceed 100% of the steady state lift. The spectral characteristics of cavitation-induced lift oscillations vary considerably over a measured range of 1.0 /2 8.5 (Arndt et al. 2000)

LES investigation of cavitating flows around a sphere with

The spectral characteristics of the wake for typical cloud cavitation conditions were classified as the periodic cavitation mode, high Strouhal number mode and low Strouhal number mode. Main frequency distributions in the wake were analyzed and different dominant flow structures were identified for each of the three modes. Open Access proceedings Journal of Physics:Conference Jul 01, 2019 · [6] Kjeldsen M, Arndt REA, Effertz M 2000 Spectral Characteristics of Sheet/Cloud Cavitation Jour. of Fluids Eng. 122(3) [7] Pelz PF, Keil T, Ludwig G 2014 On the Kinematics of Sheet and Cloud Cavitation and Related Erosion Advanced Exp. and Numer. Techniques fo Cavitation Erosion Prediction Springer Towards numerical prediction of unsteady sheet cavitation Oct 01, 2010 · The cavitation is modeled by Schnerr-Sauers cavitation model. A 2D NACA0015 foil at cavitation number =1.0 (unsteady with cloud shedding) is studied first, followed by the Delft twisted 3D foil. It is found that the present RANS method is able to predict the essential features like re-entrant jets, the periodic shearing and shedding of cloud cavities.

Water Quality and the Periodicity of Sheet/Cloud Cavitation

Oct 13, 2008 · This type of cavitation occurs under certain conditions that are characterized by the cavitation number [] and the angle of attack []. Associated with cloud cavitation are large, abrupt changes in surface pressure caused by the shedding of the attached cavity. Wavelet analysis and frequency spectrum of cloud categories cavitation regimes, where is the liquid density, Pv is the vapor pressure and P ; U are the free stream flow pressure and velocity, respectively. Several cavitation re-gimes are depending on the cavitation numbers such as incipient cavi-tation, shear cavitation, sheet/cloud cavitationSpectral Content of Cloud Cavitation about a SphereThe spectral content of the cloud cavita- tion was obtained from frequency analysis of the time series from the surface pressure measurements and high-speed pho- tography. The coherence of the two signals was measured using Pearsons Correlation Coefcient, for which the