DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ahn, Junsun | ko |
dc.contributor.author | Lee, Jae-Hwa | ko |
dc.contributor.author | Lee, Jin | ko |
dc.contributor.author | Kang, Ji Hoon | ko |
dc.contributor.author | Sung, Hyung Jin | ko |
dc.date.accessioned | 2015-11-20T07:33:36Z | - |
dc.date.available | 2015-11-20T07:33:36Z | - |
dc.date.created | 2015-06-18 | - |
dc.date.created | 2015-06-18 | - |
dc.date.issued | 2015-06 | - |
dc.identifier.citation | PHYSICS OF FLUIDS, v.27, no.6 | - |
dc.identifier.issn | 1070-6631 | - |
dc.identifier.uri | http://hdl.handle.net/10203/200740 | - |
dc.description.abstract | A direct numerical simulation of a turbulent pipe flow at a high Reynolds number of Re-tau = 3008 over a long axial domain length (30R) was performed. The stream-wise mean velocity followed the power law in the overlap region (y(+) = 90-300; y/R = 0.03-0.1) based on the power law indicator function. The scale separation of the Reynolds shear stresses into two components of small-and large-scale motions (LSMs) revealed that the LSMs in the outer region played an important role in constructing the constant-stress layer and the mean velocity. In the pre-multiplied energy spectra of the streamwise velocity fluctuations, the bimodal distribution was observed at both short and long wavelengths. The k(x)(-1) region associated with the attached eddies appeared in lambda(x)/R = 2-5 and lambda(x)/y = 18-160 at y(+) = 90-300, where the power law was established in the same region. The k(z)(-1) region also appeared in lambda(z)/R = 0.3-0.6 at y(+) = 3 and 150. Linear growth of small-scale energy to large-scale energy induced the k(x)(-1) region at high Reynolds numbers, resulting in a large population of the LSMs. This result supported the origin of very-large-scale motions in the pseudo-streamwise alignment of the LSMs. In the pre-multiplied energy spectra of the Reynolds shear stress, the bimodal distribution was observed without the k(x)(-1) region. (C) 2015 AIP Publishing LLC. | - |
dc.language | English | - |
dc.publisher | AMER INST PHYSICS | - |
dc.subject | LARGE-SCALE MOTIONS | - |
dc.subject | REYNOLDS-NUMBER | - |
dc.subject | BOUNDARY-LAYER | - |
dc.subject | LOGARITHMIC REGION | - |
dc.subject | WALL TURBULENCE | - |
dc.subject | CHANNEL FLOW | - |
dc.subject | ORGANIZATION | - |
dc.subject | FEATURES | - |
dc.subject | SPECTRA | - |
dc.title | Direct numerical simulation of a 30R long turbulent pipe flow at Re-tau=3008 | - |
dc.type | Article | - |
dc.identifier.wosid | 000357688800047 | - |
dc.type.rims | ART | - |
dc.citation.volume | 27 | - |
dc.citation.issue | 6 | - |
dc.citation.publicationname | PHYSICS OF FLUIDS | - |
dc.identifier.doi | 10.1063/1.4922612 | - |
dc.contributor.localauthor | Sung, Hyung Jin | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | LARGE-SCALE MOTIONS | - |
dc.subject.keywordPlus | REYNOLDS-NUMBER | - |
dc.subject.keywordPlus | BOUNDARY-LAYER | - |
dc.subject.keywordPlus | LOGARITHMIC REGION | - |
dc.subject.keywordPlus | WALL TURBULENCE | - |
dc.subject.keywordPlus | CHANNEL FLOW | - |
dc.subject.keywordPlus | ORGANIZATION | - |
dc.subject.keywordPlus | FEATURES | - |
dc.subject.keywordPlus | SPECTRA | - |
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