Chin. Phys. Lett.  2009, Vol. 26 Issue (2): 024701    DOI: 10.1088/0256-307X/26/2/024701
FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
Three-Dimensional Waves in Tilt Thermal Boundary Layers
TAO Jian-Jun1, YUAN Xiang-Jiang2
1LTCS and CAPT, College of Engineering, Peking University, Beijing 1008712National CFD Laboratory, Beijing 100083
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TAO Jian-Jun, YUAN Xiang-Jiang 2009 Chin. Phys. Lett. 26 024701
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Abstract We numerically and theoretically study the stabilities of tilt thermal boundary layers immersed in stratified air. An interesting phenomenon is revealed: the stationary longitudinal-roll mode becomes unstable to some oscillating state even when the Grashof number is smaller than its corresponding critical value. By stability analysis, this phenomenon is explained in terms of a new three-dimensional wave mode. The effect of the tilt angle on the stability of the boundary flows is investigated. Since the new three-dimensional wave is found to be the most unstable mode when the title angle is between 30° and 64°, it is expected to play an important role in the transition to turbulence.
Keywords: 47.20.Bp      47.15.Cb     
Received: 16 September 2008      Published: 20 January 2009
PACS:  47.20.Bp (Buoyancy-driven instabilities (e.g., Rayleigh-Benard))  
  47.15.Cb (Laminar boundary layers)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/2/024701       OR      https://cpl.iphy.ac.cn/Y2009/V26/I2/024701
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TAO Jian-Jun
YUAN Xiang-Jiang
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