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DC Field | Value | Language |
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dc.citation.number | 11 | - |
dc.citation.startPage | 114603 | - |
dc.citation.title | PHYSICAL REVIEW FLUIDS | - |
dc.citation.volume | 7 | - |
dc.contributor.author | Hwang, Jinyul | - |
dc.contributor.author | Lee, Jae Hwa | - |
dc.date.accessioned | 2023-12-21T13:19:42Z | - |
dc.date.available | 2023-12-21T13:19:42Z | - |
dc.date.created | 2022-12-06 | - |
dc.date.issued | 2022-11 | - |
dc.description.abstract | In wall turbulence, meandering behaviors of large-scale structures observed in the logarithmic layer are a crucial spatial feature to understand the spatial organization of these structures and to improve the structure-based turbulence model. These structures extend from the near-wall region to the edge of boundary layers (8). Thus, their meandering motions leave an imprint on the two-point turbulence statistics across the flow, espe-cially in the logarithmic region. Herein, we demonstrate the influence of the meandering motions of wall-attached structures on the two-point correlation and the premultiplied two-dimensional spectra by analyzing the direct numerical simulation data of the turbulent boundary layer at Re tau approximate to 1000. The meandering magnitudes of wall-attached structures increase with their height (ly) but significantly differ among the identified structures even at a given ly. In addition, the wall-attached structures of streamwise velocity fluctuations (u) are found to be aligned along with a preferred spanwise offset regardless of the meandering motion. This feature is confirmed through the conditional two-point correlations of u within the meandering structures, which leads to a distinct X pattern in the logarithmic region. We further examine the spectral behavior of the meandering structures across the streamwise and spanwise wavelengths (lambda x and lambda z, respectively) through the premultiplied two-dimensional spectra. With increasing meandering magnitudes, the energy spectra are more inclined to the lambda z direction. Furthermore, the energy spectra of the strong meandering structures are bounded by a linear relationship lambda x similar to lambda z over the large-scale range, rem-iniscent of self-similar scaling predicted by the attached-eddy hypothesis. In particular, the upper bound is aligned along lambda x approximate to 2 lambda z over lambda z > 8, which is absent in the energy spectral of the total u. This result reveals that the meandering motions allow the large-scale structures to contain wide spanwise scale energy that is self-similar in the logarithmic region. Finally, a discussion on the near-wall parts of the meandering structures is given with an emphasis on Townsend's inactive eddies. | - |
dc.identifier.bibliographicCitation | PHYSICAL REVIEW FLUIDS, v.7, no.11, pp.114603 | - |
dc.identifier.doi | 10.1103/PhysRevFluids.7.114603 | - |
dc.identifier.issn | 2469-990X | - |
dc.identifier.scopusid | 2-s2.0-85143733315 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/60097 | - |
dc.identifier.wosid | 000885559000001 | - |
dc.language | 영어 | - |
dc.publisher | AMER PHYSICAL SOC | - |
dc.title | Meandering features of wall-attached structures in turbulent boundary layer | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Physics, Fluids & Plasmas | - |
dc.relation.journalResearchArea | Physics | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | CHANNEL | - |
dc.subject.keywordPlus | FLUCTUATIONS | - |
dc.subject.keywordPlus | VELOCITY | - |
dc.subject.keywordPlus | ORGANIZATION | - |
dc.subject.keywordPlus | MODULATION | - |
dc.subject.keywordPlus | AMPLITUDE | - |
dc.subject.keywordPlus | LARGE-SCALE MOTIONS | - |
dc.subject.keywordPlus | COHERENT MOTIONS | - |
dc.subject.keywordPlus | OUTER REGION | - |
dc.subject.keywordPlus | PIPE-FLOW | - |
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