DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, I | ko |
dc.contributor.author | Sung, Hyung Jin | ko |
dc.date.accessioned | 2009-11-27T01:46:08Z | - |
dc.date.available | 2009-11-27T01:46:08Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2002 | - |
dc.identifier.citation | JOURNAL OF FLUID MECHANICS, v.463, pp.377 - 402 | - |
dc.identifier.issn | 0022-1120 | - |
dc.identifier.uri | http://hdl.handle.net/10203/13519 | - |
dc.description.abstract | Spatio-temporal characteristics of wall pressure fluctuations in separated and re-attaching flows over a backward-facing step were investigated through an extensive pressure-velocity joint measurement with an array of microphones. The experiment was performed in a wind tunnel with a Reynolds number of 33 000 based on the step height and the free-stream velocity. Synchronized wavelet maps showed the evolutionary behaviour of pressure fluctuations and gave further insight into the modulated nature of large-scale vortical structures. To see the relationship between the flow field and the relevant spatial mode of the pressure field, a new kind of wavenumber filtering, termed 'spatial box filtering' (SBF), was introduced and examined. The vortical flow field was reconstructed using every single-point velocity measurement by means of the conditional average based on the SBF second mode of pressure fluctuations. The flow field showed a well-organized spanwise vortical structure convected with a speed of 0.6U(0) and a characteristic 'sawtooth' pattern of the unsteady trace of reattachment length. In addition to the coherent vortical structures, the periodic enlargement/shrinkage process of the recirculation region owing to flapping motion was analysed. The recirculation region was found to undergo an enlargement/shrinkage cycle in accordance with the lowpass-filtered component of pressure fluctuations. In addition, such modulatory behaviour of the vortical structure as the global oscillation phase was discussed in connection with the conditionally averaged flow field. | - |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | CAMBRIDGE UNIV PRESS | - |
dc.subject | BACKWARD-FACING STEP | - |
dc.subject | WAVELET ANALYSIS | - |
dc.subject | SEPARATED FLOW | - |
dc.subject | TURBULENT-FLOW | - |
dc.subject | FLUCTUATIONS | - |
dc.subject | BEHAVIOR | - |
dc.title | Multiple-arrayed pressure measurement for investigation of the unsteady flow structure of a reattaching shear layer | - |
dc.type | Article | - |
dc.identifier.wosid | 000177475400015 | - |
dc.identifier.scopusid | 2-s2.0-0036337164 | - |
dc.type.rims | ART | - |
dc.citation.volume | 463 | - |
dc.citation.beginningpage | 377 | - |
dc.citation.endingpage | 402 | - |
dc.citation.publicationname | JOURNAL OF FLUID MECHANICS | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Sung, Hyung Jin | - |
dc.contributor.nonIdAuthor | Lee, I | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | BACKWARD-FACING STEP | - |
dc.subject.keywordPlus | WAVELET ANALYSIS | - |
dc.subject.keywordPlus | SEPARATED FLOW | - |
dc.subject.keywordPlus | TURBULENT-FLOW | - |
dc.subject.keywordPlus | FLUCTUATIONS | - |
dc.subject.keywordPlus | BEHAVIOR | - |
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