Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.1941367
DC FieldValue
dc.titleSecondary instability in forced wavelength Görtler vortices
dc.contributor.authorMitsudharmadi, H.
dc.contributor.authorWinoto, S.H.
dc.contributor.authorShah, D.A.
dc.date.accessioned2014-06-17T06:33:03Z
dc.date.available2014-06-17T06:33:03Z
dc.date.issued2005-07
dc.identifier.citationMitsudharmadi, H., Winoto, S.H., Shah, D.A. (2005-07). Secondary instability in forced wavelength Görtler vortices. Physics of Fluids 17 (7) : 1-8. ScholarBank@NUS Repository. https://doi.org/10.1063/1.1941367
dc.identifier.issn10706631
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/61269
dc.description.abstractFrom an experimental study on the onset of secondary instability in forced wavelength Görtler vortices, it is found that the breakdown process of the Görtler vortices is due to the development of varicose and sinuous mode instabilities. The development of the varicose mode is characterized by the formation of horseshoe vortices that evolve downstream to form mushroom-like structures. This phenomenon is then followed by meandering of the vortices as an indication of the onset of sinuous mode instability, prior to turbulence. The spectrum analysis applied to the fluctuating velocity component shows the occurrence of peak frequency of about 150Hz, which is attributed to the fundamental secondary instability mode with its wavelength comparable to the spanwise wavelength of the primary Görtler vortices, at the location where the mushroom-like structures are clearly depicted in the mean velocity contours on the y-z plane. This confirms that the secondary instability is of the varicose type at the onset that is followed by the sinuous type downstream, prior to the breakdown of the vortices that will lead the boundary layer flow to turbulence. It is also found that the growth rate of the secondary instability observed is about 6.5 times higher than that of the Görtler instability, which leads to a breakdown of the streamwise structures and hence to turbulence. © 2005 American Institute of Physics.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1063/1.1941367
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentMECHANICAL ENGINEERING
dc.description.doi10.1063/1.1941367
dc.description.sourcetitlePhysics of Fluids
dc.description.volume17
dc.description.issue7
dc.description.page1-8
dc.description.codenPHFLE
dc.identifier.isiut000230633700024
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