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

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 <inline-formul...

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Autores principales:	Elizaveta Ivashchenko, Mikhail Hrebtov, Mikhail Timoshevskiy, Konstantin Pervunin, Rustam Mullyadzhanov
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cavitation hydrofoil large-eddy simulations particle image velocimetry Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/7b12eaabca234338aa81c929b72c6386
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spelling	oai:doaj.org-article:7b12eaabca234338aa81c929b72c63862021-11-25T18:04:04ZSystematic Validation Study of an Unsteady Cavitating Flow over a Hydrofoil Using Conditional Averaging: LES and PIV10.3390/jmse91111932077-1312https://doaj.org/article/7b12eaabca234338aa81c929b72c63862021-10-01T00:00:00Zhttps://www.mdpi.com/2077-1312/9/11/1193https://doaj.org/toc/2077-1312We 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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>R</mi><msub><mi>e</mi><mi>C</mi></msub></mrow></semantics></math></inline-formula> of the order of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mn>6</mn></msup></semantics></math></inline-formula> 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.Elizaveta IvashchenkoMikhail HrebtovMikhail TimoshevskiyKonstantin PervuninRustam MullyadzhanovMDPI AGarticlecavitationhydrofoillarge-eddy simulationsparticle image velocimetryNaval architecture. Shipbuilding. Marine engineeringVM1-989OceanographyGC1-1581ENJournal of Marine Science and Engineering, Vol 9, Iss 1193, p 1193 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cavitation hydrofoil large-eddy simulations particle image velocimetry Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
spellingShingle	cavitation hydrofoil large-eddy simulations particle image velocimetry Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 Elizaveta Ivashchenko Mikhail Hrebtov Mikhail Timoshevskiy Konstantin Pervunin Rustam Mullyadzhanov Systematic Validation Study of an Unsteady Cavitating Flow over a Hydrofoil Using Conditional Averaging: LES and PIV
description	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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>R</mi><msub><mi>e</mi><mi>C</mi></msub></mrow></semantics></math></inline-formula> of the order of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mn>6</mn></msup></semantics></math></inline-formula> 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.
format	article
author	Elizaveta Ivashchenko Mikhail Hrebtov Mikhail Timoshevskiy Konstantin Pervunin Rustam Mullyadzhanov
author_facet	Elizaveta Ivashchenko Mikhail Hrebtov Mikhail Timoshevskiy Konstantin Pervunin Rustam Mullyadzhanov
author_sort	Elizaveta Ivashchenko
title	Systematic Validation Study of an Unsteady Cavitating Flow over a Hydrofoil Using Conditional Averaging: LES and PIV
title_short	Systematic Validation Study of an Unsteady Cavitating Flow over a Hydrofoil Using Conditional Averaging: LES and PIV
title_full	Systematic Validation Study of an Unsteady Cavitating Flow over a Hydrofoil Using Conditional Averaging: LES and PIV
title_fullStr	Systematic Validation Study of an Unsteady Cavitating Flow over a Hydrofoil Using Conditional Averaging: LES and PIV
title_full_unstemmed	Systematic Validation Study of an Unsteady Cavitating Flow over a Hydrofoil Using Conditional Averaging: LES and PIV
title_sort	systematic validation study of an unsteady cavitating flow over a hydrofoil using conditional averaging: les and piv
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7b12eaabca234338aa81c929b72c6386
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_version_	1718411687824982016

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

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