Very-large-scale motions in a turbulent channel flow

Jin Lee, Jae Hwa Lee, Jung Il Choi, Hyung Jin Sung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Direct numerical simulation was carried out to investigate the spatial features of very large-scale motions (VLSMs) in a turbulent channel flow with Ret- 930. Using the streak detection algorithm and the population trend, statistics of the spatial extents for both large-scale motions (LSMs) and VLSMs were obtained. This result showed that, at least one VLSM, on average, can be found in the wall-parallel 10d × d plane (here d is the channel half height), which provides a statistical evidence of the presence of VLSMs. Moreover, to clarify one of previous hypotheses regarding the formation of VLSMs, the upstream tracking of individual streaks was utilized for temporal analysis. The present study statistically supported that the connection of the upstream LSMs is mainly contributed to the formation of VLSMs; that is, the concatenation of the small structures to form VLSMs. The downstream tracking of VLSMs indicated that over than 30% of VLSMs survive for 9 wall-unit time. Finally, the spatial organization of LSMs and VLSMs was examined by the conditional averaging.

Original languageEnglish
Title of host publicationInternational Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
PublisherTSFP-8
Volume1
ISBN (Electronic)9780000000002
Publication statusPublished - 2013 Jan 1
Event8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 - Poitiers, France
Duration: 2013 Aug 282013 Aug 30

Other

Other8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
CountryFrance
CityPoitiers
Period13/8/2813/8/30

Fingerprint

Population statistics
Direct numerical simulation
Channel flow

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

Cite this

Lee, J., Lee, J. H., Choi, J. I., & Sung, H. J. (2013). Very-large-scale motions in a turbulent channel flow. In International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 (Vol. 1). TSFP-8.
Lee, Jin ; Lee, Jae Hwa ; Choi, Jung Il ; Sung, Hyung Jin. / Very-large-scale motions in a turbulent channel flow. International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. Vol. 1 TSFP-8, 2013.
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abstract = "Direct numerical simulation was carried out to investigate the spatial features of very large-scale motions (VLSMs) in a turbulent channel flow with Ret- 930. Using the streak detection algorithm and the population trend, statistics of the spatial extents for both large-scale motions (LSMs) and VLSMs were obtained. This result showed that, at least one VLSM, on average, can be found in the wall-parallel 10d × d plane (here d is the channel half height), which provides a statistical evidence of the presence of VLSMs. Moreover, to clarify one of previous hypotheses regarding the formation of VLSMs, the upstream tracking of individual streaks was utilized for temporal analysis. The present study statistically supported that the connection of the upstream LSMs is mainly contributed to the formation of VLSMs; that is, the concatenation of the small structures to form VLSMs. The downstream tracking of VLSMs indicated that over than 30{\%} of VLSMs survive for 9 wall-unit time. Finally, the spatial organization of LSMs and VLSMs was examined by the conditional averaging.",
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Lee, J, Lee, JH, Choi, JI & Sung, HJ 2013, Very-large-scale motions in a turbulent channel flow. in International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. vol. 1, TSFP-8, 8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, Poitiers, France, 13/8/28.

Very-large-scale motions in a turbulent channel flow. / Lee, Jin; Lee, Jae Hwa; Choi, Jung Il; Sung, Hyung Jin.

International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. Vol. 1 TSFP-8, 2013.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Sung, Hyung Jin

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N2 - Direct numerical simulation was carried out to investigate the spatial features of very large-scale motions (VLSMs) in a turbulent channel flow with Ret- 930. Using the streak detection algorithm and the population trend, statistics of the spatial extents for both large-scale motions (LSMs) and VLSMs were obtained. This result showed that, at least one VLSM, on average, can be found in the wall-parallel 10d × d plane (here d is the channel half height), which provides a statistical evidence of the presence of VLSMs. Moreover, to clarify one of previous hypotheses regarding the formation of VLSMs, the upstream tracking of individual streaks was utilized for temporal analysis. The present study statistically supported that the connection of the upstream LSMs is mainly contributed to the formation of VLSMs; that is, the concatenation of the small structures to form VLSMs. The downstream tracking of VLSMs indicated that over than 30% of VLSMs survive for 9 wall-unit time. Finally, the spatial organization of LSMs and VLSMs was examined by the conditional averaging.

AB - Direct numerical simulation was carried out to investigate the spatial features of very large-scale motions (VLSMs) in a turbulent channel flow with Ret- 930. Using the streak detection algorithm and the population trend, statistics of the spatial extents for both large-scale motions (LSMs) and VLSMs were obtained. This result showed that, at least one VLSM, on average, can be found in the wall-parallel 10d × d plane (here d is the channel half height), which provides a statistical evidence of the presence of VLSMs. Moreover, to clarify one of previous hypotheses regarding the formation of VLSMs, the upstream tracking of individual streaks was utilized for temporal analysis. The present study statistically supported that the connection of the upstream LSMs is mainly contributed to the formation of VLSMs; that is, the concatenation of the small structures to form VLSMs. The downstream tracking of VLSMs indicated that over than 30% of VLSMs survive for 9 wall-unit time. Finally, the spatial organization of LSMs and VLSMs was examined by the conditional averaging.

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Lee J, Lee JH, Choi JI, Sung HJ. Very-large-scale motions in a turbulent channel flow. In International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. Vol. 1. TSFP-8. 2013