A Standard Criterion for Measuring Turbulence Quantities Using the Four-Receiver Acoustic Doppler Velocimetry
Acoustic Doppler velocimetry (ADV) enables three-dimensional turbulent flow fields to be obtained with high spatial and temporal resolutions in the laboratory, rivers, and oceans. Although such advantages have led ADV to become a typical approach for analyzing various fluid dynamics mechanisms, the...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2021-08-01
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| Series: | Frontiers in Marine Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2021.681265/full |
| _version_ | 1819150691112845312 |
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| author | Hyoungchul Park Jin Hwan Hwang Jin Hwan Hwang |
| author_facet | Hyoungchul Park Jin Hwan Hwang Jin Hwan Hwang |
| author_sort | Hyoungchul Park |
| collection | DOAJ |
| description | Acoustic Doppler velocimetry (ADV) enables three-dimensional turbulent flow fields to be obtained with high spatial and temporal resolutions in the laboratory, rivers, and oceans. Although such advantages have led ADV to become a typical approach for analyzing various fluid dynamics mechanisms, the vagueness of ADV system operation methods has reduced its accuracy and efficiency. Accordingly, the present work suggests a proper measurement strategy for a four-receiver ADV system to obtain reliable turbulence quantities by performing laboratory experiments under two flow conditions. Firstly, in still water, the magnitude of noises was evaluated and a proper operation method was developed to obtain the Reynolds stress with lower noises. Secondly, in channel flows, an optimal sampling period was determined based on the integral time scale by applying the bootstrap sampling method and reverse arrangement test. The results reveal that the noises of the streamwise and transverse velocity components are an order of magnitude larger than those of the vertical velocity components. The orthogonally paired receivers enable the estimation of almost-error-free Reynolds stresses and the optimal sampling period is 150–200 times the integral time scale, regardless of the measurement conditions. |
| first_indexed | 2024-12-22T14:21:31Z |
| format | Article |
| id | doaj.art-b92aaa6cbbbb41a3b6598cabe4feef57 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-12-22T14:21:31Z |
| publishDate | 2021-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-b92aaa6cbbbb41a3b6598cabe4feef572022-12-21T18:22:59ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452021-08-01810.3389/fmars.2021.681265681265A Standard Criterion for Measuring Turbulence Quantities Using the Four-Receiver Acoustic Doppler VelocimetryHyoungchul Park0Jin Hwan Hwang1Jin Hwan Hwang2Department of Civil and Environmental Engineering, Seoul National University, Seoul, South KoreaDepartment of Civil and Environmental Engineering, Seoul National University, Seoul, South KoreaInstitute of Construction and Environmental Engineering, Seoul National University, Seoul, South KoreaAcoustic Doppler velocimetry (ADV) enables three-dimensional turbulent flow fields to be obtained with high spatial and temporal resolutions in the laboratory, rivers, and oceans. Although such advantages have led ADV to become a typical approach for analyzing various fluid dynamics mechanisms, the vagueness of ADV system operation methods has reduced its accuracy and efficiency. Accordingly, the present work suggests a proper measurement strategy for a four-receiver ADV system to obtain reliable turbulence quantities by performing laboratory experiments under two flow conditions. Firstly, in still water, the magnitude of noises was evaluated and a proper operation method was developed to obtain the Reynolds stress with lower noises. Secondly, in channel flows, an optimal sampling period was determined based on the integral time scale by applying the bootstrap sampling method and reverse arrangement test. The results reveal that the noises of the streamwise and transverse velocity components are an order of magnitude larger than those of the vertical velocity components. The orthogonally paired receivers enable the estimation of almost-error-free Reynolds stresses and the optimal sampling period is 150–200 times the integral time scale, regardless of the measurement conditions.https://www.frontiersin.org/articles/10.3389/fmars.2021.681265/fullturbulenceacoustic velocimetersampling timesintegral time scalessampling error reduction |
| spellingShingle | Hyoungchul Park Jin Hwan Hwang Jin Hwan Hwang A Standard Criterion for Measuring Turbulence Quantities Using the Four-Receiver Acoustic Doppler Velocimetry Frontiers in Marine Science turbulence acoustic velocimeter sampling times integral time scales sampling error reduction |
| title | A Standard Criterion for Measuring Turbulence Quantities Using the Four-Receiver Acoustic Doppler Velocimetry |
| title_full | A Standard Criterion for Measuring Turbulence Quantities Using the Four-Receiver Acoustic Doppler Velocimetry |
| title_fullStr | A Standard Criterion for Measuring Turbulence Quantities Using the Four-Receiver Acoustic Doppler Velocimetry |
| title_full_unstemmed | A Standard Criterion for Measuring Turbulence Quantities Using the Four-Receiver Acoustic Doppler Velocimetry |
| title_short | A Standard Criterion for Measuring Turbulence Quantities Using the Four-Receiver Acoustic Doppler Velocimetry |
| title_sort | standard criterion for measuring turbulence quantities using the four receiver acoustic doppler velocimetry |
| topic | turbulence acoustic velocimeter sampling times integral time scales sampling error reduction |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2021.681265/full |
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