DC Field | Value | Language |
---|---|---|
dc.contributor.author | Baek, SJ | ko |
dc.contributor.author | Lee, SB | ko |
dc.contributor.author | Sung, Hyung Jin | ko |
dc.date.accessioned | 2009-08-25T02:25:43Z | - |
dc.date.available | 2009-08-25T02:25:43Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2001 | - |
dc.identifier.citation | JOURNAL OF FLUID MECHANICS, v.442, pp.67 - 88 | - |
dc.identifier.issn | 0022-1120 | - |
dc.identifier.uri | http://hdl.handle.net/10203/10743 | - |
dc.description.abstract | A systematic numerical analysis is performed for superharmonic excitations in a wake where a circular cylinder is rotationally oscillated in time. Emphasis is placed on identifying the secondary and tertiary lock-on in the forced wakes. The frequency responses are scrutinized by measuring the lift coefficient (C-L). A direct numerical simulation has been conducted to portray the unsteady dynamics of wake flows behind a circular cylinder. The Reynolds number based on the diameter is Re = 106, and the forcing magnitude is 0.10 less than or equal to Ohm (max) less than or equal to 0.40. The tertiary lock-on is observed, where the shedding frequency (St(0)) is one third of the forcing frequency (S-f), i.e. the 1/3 subharmonic lock-on. The phase shift of C-L with respect to the forcing frequency is observed. It is similar to that of the primary lock-on. However, in the secondary superharmonic excitation, modulated oscillations are observed, i.e. the lock-on does not exist. As Ohm (max) increases, St(0) is gradually shifted from the natural shedding frequency (St(0)*) to lower values. The magnitudes and phases of S-f and St(0) are analysed by the phase diagram. The vorticity contours are employed to examine the vortex formation mode against the forcing conditions. | - |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | CAMBRIDGE UNIV PRESS | - |
dc.subject | LOW REYNOLDS-NUMBERS | - |
dc.subject | OSCILLATING CYLINDER | - |
dc.subject | NUMERICAL-SIMULATION | - |
dc.subject | LOCK-ON | - |
dc.subject | FLOW | - |
dc.subject | UNIFORM | - |
dc.title | Response of a circular cylinder wake to superharmonic excitation | - |
dc.type | Article | - |
dc.identifier.wosid | 000171095600003 | - |
dc.identifier.scopusid | 2-s2.0-0035840107 | - |
dc.type.rims | ART | - |
dc.citation.volume | 442 | - |
dc.citation.beginningpage | 67 | - |
dc.citation.endingpage | 88 | - |
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 | Baek, SJ | - |
dc.contributor.nonIdAuthor | Lee, SB | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | LOW REYNOLDS-NUMBERS | - |
dc.subject.keywordPlus | OSCILLATING CYLINDER | - |
dc.subject.keywordPlus | NUMERICAL-SIMULATION | - |
dc.subject.keywordPlus | LOCK-ON | - |
dc.subject.keywordPlus | FLOW | - |
dc.subject.keywordPlus | UNIFORM | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.