Formation of power-law scalings of spectra and multiscale coherent structures in the near-field of grid-generated turbulence

Yasuda, Tatsuya; Goto, Susumu; Vassilicos, John Christos

doi:https://doi.org/10.1103/PhysRevFluids.5.014601

Formation of power-law scalings of spectra and multiscale coherent structures in the near-field of grid-generated turbulence

Yasuda, Tatsuya; Goto, Susumu; Vassilicos, John Christos

Physical Review Fluids, 2020, 5(1), 014601

アクセス数:334件（2025-10-23 15:42 集計）

固定URL: https://hdl.handle.net/11094/100045

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タイトル	Formation of power-law scalings of spectra and multiscale coherent structures in the near-field of grid-generated turbulence
著者	著者名 Yasuda, Tatsuya
	NRID 1000040321616 1000040321616 ORCID 0000-0001-7013-7967 0000-0001-7013-7967 researchmap permalink read0193841 read0193841 Scopus Author ID 56040611400 56040611400 著者名 Goto, Susumu
	著者名 Vassilicos, John Christos
内容	Yasuda T., Goto S., Vassilicos J.C. Formation of power-law scalings of spectra and multiscale coherent structures in the near-field of grid-generated turbulence. Physical Review Fluids 5, 014601 (2020); https://doi.org/10.1103/PhysRevFluids.5.014601.
抄録	We investigate the streamwise evolutions of energy and pressure spectra along the shear-layer region of very near-field grid-generated turbulence. The energy and pressure spectra evolve significantly in this near-field. The shear-layer and vortex-shedding frequencies appear immediately in different spectra but the shear-layer's spectral signature is very soon replaced by a broad power-law spectrum on both sides of that frequency. The spectra evolve further by filling the gap between the vortex shedding and the shear-layer frequencies eventually leading to near -5/3 power-law energy spectra at the point on the shear-layer region where the turbulence intensity reaches a maximum. The pressure spectrum reaches a -7/3 power-law shape significantly further downstream. These spectral scalings cover a range between the vortex-shedding frequency and frequencies larger than the shear-layer frequency. They are discussed in relation to turbulent coherent structures of various sizes, obtained by using Gaussian low-pass filtering of instantaneous turbulent flow fields. High enstrophy small-scale structures originate from the shear-layer instability whereas low enstrophy large-scale structures originate from the vortex shedding. The generation of near-field -5/3 energy and -7/3 pressure spectra involves cooperative interactions between these two different size structures.
出版者	American Physical Society
収録物名	Physical Review Fluids
巻(号)	5(1)
ページ	014601
刊行年月	2020-01-13
言語	英語
ハンドルURL	https://hdl.handle.net/11094/100045
eISSN	2469990X
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1103/PhysRevFluids.5.014601
アクセス権	open access
権利情報	Copyright 2020 by the American Physical Society
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCTERMS.bibliographicCitation	Physical Review Fluids. 2020, 5(1), p. 014601
DC.title	Formation of power-law scalings of spectra and multiscale coherent structures in the near-field of grid-generated turbulence
DC.creator	Yasuda, Tatsuya
	Goto, Susumu
	Vassilicos, John Christos
DC.publisher	American Physical Society
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2020-01-13
DC.identifier	https://doi.org/10.1103/PhysRevFluids.5.014601
DC.description	Yasuda T., Goto S., Vassilicos J.C. Formation of power-law scalings of spectra and multiscale coherent structures in the near-field of grid-generated turbulence. Physical Review Fluids 5, 014601 (2020); https://doi.org/10.1103/PhysRevFluids.5.014601.
DCTERMS.abstract	We investigate the streamwise evolutions of energy and pressure spectra along the shear-layer region of very near-field grid-generated turbulence. The energy and pressure spectra evolve significantly in this near-field. The shear-layer and vortex-shedding frequencies appear immediately in different spectra but the shear-layer's spectral signature is very soon replaced by a broad power-law spectrum on both sides of that frequency. The spectra evolve further by filling the gap between the vortex shedding and the shear-layer frequencies eventually leading to near -5/3 power-law energy spectra at the point on the shear-layer region where the turbulence intensity reaches a maximum. The pressure spectrum reaches a -7/3 power-law shape significantly further downstream. These spectral scalings cover a range between the vortex-shedding frequency and frequencies larger than the shear-layer frequency. They are discussed in relation to turbulent coherent structures of various sizes, obtained by using Gaussian low-pass filtering of instantaneous turbulent flow fields. High enstrophy small-scale structures originate from the shear-layer instability whereas low enstrophy large-scale structures originate from the vortex shedding. The generation of near-field -5/3 energy and -7/3 pressure spectra involves cooperative interactions between these two different size structures.
DC.rights	Copyright 2020 by the American Physical Society
DC.format	100045
citation_title	Formation of power-law scalings of spectra and multiscale coherent structures in the near-field of grid-generated turbulence
citation_author	Yasuda, Tatsuya
	Goto, Susumu
	Vassilicos, John Christos
citation_publisher	American Physical Society
citation_language	英語
citation_date	2020-01-13
citation_journal_title	Physical Review Fluids
citation_volume	5
citation_issue	1
citation_firstpage	014601
citation_doi	https://doi.org/10.1103/PhysRevFluids.5.014601
citation_public_url	https://hdl.handle.net/11094/100045

Formation of power-law scalings of spectra and multiscale coherent structures in the near-field of grid-generated turbulence

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