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On the merging of turbulent spots in a supersonic boundary-layer flow
- Source :
-
International Journal of Heat & Fluid Flow . Aug2006, Vol. 27 Issue 4, p542-550. 9p. - Publication Year :
- 2006
-
Abstract
- Abstract: The complex transition flow physics associated with the merging of turbulent spots in a Mach 2 boundary-layer has been studied using direct numerical simulation. Dynamics of an isolated turbulent spot, merging of laterally displaced spots, and merging of two spots in tandem are considered. The coherent structures associated with the wingtip region of the spot are found to play a major role in destabilising the surrounding laminar fluid. In the merging of laterally displaced spots a strong velocity defect, resulting in unstable inflectional velocity profiles, is observed in the interaction zone. These local inflectional instabilities within the interaction region trigger new large scale coherent structures. During the inline merging, the calmed region behind the tail of the downstream spot is found to suppress the growth of the upstream spot. The upstream spot is ultimately engulfed by the downstream spot. [Copyright &y& Elsevier]
- Subjects :
- *TURBULENCE
*FLUID dynamics
*DYNAMICS
*FLUID mechanics
Subjects
Details
- Language :
- English
- ISSN :
- 0142727X
- Volume :
- 27
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- International Journal of Heat & Fluid Flow
- Publication Type :
- Academic Journal
- Accession number :
- 21576572
- Full Text :
- https://doi.org/10.1016/j.ijheatfluidflow.2006.02.002