DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ma, Guo-Zhen | ko |
dc.contributor.author | Xu, Chun-Xiao | ko |
dc.contributor.author | Sung, Hyung Jin | ko |
dc.contributor.author | Huang, Wei-Xi | ko |
dc.date.accessioned | 2020-08-26T04:55:13Z | - |
dc.date.available | 2020-08-26T04:55:13Z | - |
dc.date.created | 2020-08-24 | - |
dc.date.created | 2020-08-24 | - |
dc.date.created | 2020-08-24 | - |
dc.date.issued | 2020-10 | - |
dc.identifier.citation | JOURNAL OF FLUID MECHANICS, v.900 | - |
dc.identifier.issn | 0022-1120 | - |
dc.identifier.uri | http://hdl.handle.net/10203/275986 | - |
dc.description.abstract | A roughness scaling behaviour is tested by performing the direct numerical simulation (DNS) of a turbulent channel flow over three-dimensional sinusoidal rough walls. By systematically varying the roughness height k(+) and the roughness steepness S, the results for three groups of cases are considered and compared with those for flat-wall turbulence. The results show that the mean velocity and Reynolds stresses are highly dependent on both k(+) and S. To describe these specific relationships, we define a coupling scale k(+) S. With this coupling scale, all the simulated data for the roughness function (Delta U+), the ratio of the pressure drag to the total wall resistance (gamma(p)), the normalized bulk mean velocity (U-b(+)) and the peak of the streamwise turbulent velocity fluctuations ((u(p)'(+)) over bar) collapse onto single curves, which shows that there is a strong direct correlation between them, i.e. Delta U+, gamma(p), U-b(+), (u(p)'(+)) over bar proportional to f(k(+) S). Furthermore, a model for the prediction of wall resistance based on the roughness function can be established by defining a drag increasing ratio (DI). Accordingly, the wall resistance coefficient C-f can be estimated directly from k(+)S of a given rough surface. These results suggest that this coupling scale provides a useful alternative to the equivalent sand grain roughness k(s). | - |
dc.language | English | - |
dc.publisher | CAMBRIDGE UNIV PRESS | - |
dc.title | Scaling of rough-wall turbulence by the roughness height and steepness | - |
dc.type | Article | - |
dc.identifier.wosid | 000557836200001 | - |
dc.identifier.scopusid | 2-s2.0-85089875432 | - |
dc.type.rims | ART | - |
dc.citation.volume | 900 | - |
dc.citation.publicationname | JOURNAL OF FLUID MECHANICS | - |
dc.identifier.doi | 10.1017/jfm.2020.542 | - |
dc.contributor.localauthor | Sung, Hyung Jin | - |
dc.contributor.nonIdAuthor | Ma, Guo-Zhen | - |
dc.contributor.nonIdAuthor | Xu, Chun-Xiao | - |
dc.contributor.nonIdAuthor | Huang, Wei-Xi | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | turbulence simulation | - |
dc.subject.keywordAuthor | turbulent boundary layers | - |
dc.subject.keywordPlus | DIRECT NUMERICAL-SIMULATION | - |
dc.subject.keywordPlus | BOUNDARY-LAYER | - |
dc.subject.keywordPlus | FLOW | - |
dc.subject.keywordPlus | SURFACES | - |
dc.subject.keywordPlus | CHANNEL | - |
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