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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MDPI AG
2021-10-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/9/11/1193 |
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| 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 |
| collection | DOAJ |
| 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. |
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| format | Article |
| id | doaj.art-7b12eaabca234338aa81c929b72c6386 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T05:23:44Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-7b12eaabca234338aa81c929b72c63862023-11-22T23:53:09ZengMDPI AGJournal of Marine Science and Engineering2077-13122021-10-01911119310.3390/jmse9111193Systematic Validation Study of an Unsteady Cavitating Flow over a Hydrofoil Using Conditional Averaging: LES and PIVElizaveta Ivashchenko0Mikhail Hrebtov1Mikhail Timoshevskiy2Konstantin Pervunin3Rustam Mullyadzhanov4Institute of Thermophysics SB RAS, Lavrentyev Ave. 1, 630090 Novosibirsk, RussiaInstitute of Thermophysics SB RAS, Lavrentyev Ave. 1, 630090 Novosibirsk, RussiaInstitute of Thermophysics SB RAS, Lavrentyev Ave. 1, 630090 Novosibirsk, RussiaInstitute of Thermophysics SB RAS, Lavrentyev Ave. 1, 630090 Novosibirsk, RussiaInstitute of Thermophysics SB RAS, Lavrentyev Ave. 1, 630090 Novosibirsk, RussiaWe 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.https://www.mdpi.com/2077-1312/9/11/1193cavitationhydrofoillarge-eddy simulationsparticle image velocimetry |
| spellingShingle | 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 Journal of Marine Science and Engineering cavitation hydrofoil large-eddy simulations particle image velocimetry |
| title | 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_short | 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 |
| topic | cavitation hydrofoil large-eddy simulations particle image velocimetry |
| url | https://www.mdpi.com/2077-1312/9/11/1193 |
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