A new method of LES verification and validation for attached turbulent cavitating flow

Abstract A new method was developed for statistical analysis of ensembles of instantaneous velocity fields measured by PIV in liquid (continuous phase) to determine the distribution of the vapor phase in cavitating flow. The method is based on two main principles: the absence of tracers used for PIV measurements in vapor, and the statistical independence of individual measurements. This allowed establishing an exponential dependence of repeatability of the vapor phase at a certain point of a cavitating flow. Compliance with this theoretical law was verified using the Pearson chi-square test. All theoretical distributions were divided into several groups depending on the time-averaged local vapor content calculated over the entire ensemble of realizations and the probability of a single event. As a result, dimensions of the stationary part of an attached cavity and the place of detachments of cloud cavities from the hydrofoil surface were determined using the new method of statistical analysis for an unsteady cloud cavitation regime.

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URANS simulations of the tip-leakage cavitating flow with verification and validation procedures

Journal of Hydrodynamics ◽

10.1007/s42241-018-0038-1 ◽

2018 ◽

Vol 30 (3) ◽

pp. 531-534 ◽

Cited By ~ 10

Author(s):

Huai-yu Cheng ◽

Xin-ping Long ◽

Yun-zhi Liang ◽

Yun Long ◽

Bin Ji

Keyword(s):

Cavitating Flow ◽

Verification And Validation ◽

Tip Leakage

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Verification and validation of Large Eddy Simulation of attached cavitating flow around a Clark-Y hydrofoil

International Journal of Multiphase Flow ◽

10.1016/j.ijmultiphaseflow.2019.03.026 ◽

2019 ◽

Vol 115 ◽

pp. 93-107 ◽

Cited By ~ 38

Author(s):

Yun Long ◽

Xinping Long ◽

Bin Ji ◽

Tao Xing

Keyword(s):

Large Eddy Simulation ◽

Cavitating Flow ◽

Verification And Validation ◽

Eddy Simulation ◽

Large Eddy

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Selective Sampling and Orientation of Non-Homogeneous Tissues

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100100238 ◽

1968 ◽

Vol 26 ◽

pp. 98-99

Author(s):

C. C. Clawson ◽

L. W. Anderson ◽

R. A. Good

Keyword(s):

Electron Microscopy ◽

Electron Microscope ◽

Light Microscopy ◽

Random Sampling ◽

New Method ◽

Microscope Examination ◽

Small Areas ◽

Selective Sampling ◽

Large Numbers ◽

Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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