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Systematic Validation Study of an Unsteady Cavitating Flow over a Hydrofoil Using Conditional Averaging: LES and PIV

Authors :
Mikhail Hrebtov
Mikhail V. Timoshevskiy
Konstantin S. Pervunin
Elizaveta Ivashchenko
Rustam Mullyadzhanov
Source :
Journal of Marine Science and Engineering, Vol 9, Iss 1193, p 1193 (2021), Journal of Marine Science and Engineering, Volume 9, Issue 11
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

We present results of Large-eddy simulations (LES) modeling of steady sheet and unsteady cloud cavitation on a two-dimensional hydrofoil which are validated against Particle image velocimetry (PIV) data. The study is performed for the angle of attack of 9° and high Reynolds numbers ReC of the order of 106 providing a strong adverse pressure gradient along the surface. We employ the Schnerr–Sauer and Kunz cavitation models together with the adaptive mesh refinement in critical flow regions where intensive phase transitions occur. Comparison of the LES and visualization results confirms that the flow dynamics is adequately reproduced in the calculations. To correctly match averaged velocity distributions, we propose a new methodology based on conditional averaging of instantaneous velocity fields measured by PIV which only provides information on the liquid phase. This approach leads to an excellent overall agreement between the conditionally averaged fields of the mean velocity and turbulence intensity obtained experimentally and numerically. The benefits of second-order discretization schemes are highlighted as opposed to the lower-order TVD scheme.

Details

Language :
English
ISSN :
20771312
Volume :
9
Issue :
1193
Database :
OpenAIRE
Journal :
Journal of Marine Science and Engineering
Accession number :
edsair.doi.dedup.....ae03e8c3c2ca4543b2c3faa3597f6f25