Secondary crossflow instability through global analysis of measured base flows
نویسندگان
چکیده
منابع مشابه
Secondary instability of crossflow vortices
Crossflow-dominated swept-wing boundary layers are known to undergo a highly nonlinear transition process. In low-disturbance environments, the primary instability of these flows consists mainly of stationary streamwise vortices that modify the mean velocity field and hence the stability characteristics of the boundary layer. The result is amplitude saturation of the dominant stationary mode an...
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The flow in an enclosed rotating cylinder with a stationary lower end wall is investigated numerically. For fast rotation rates, the flow in the interior is primarily in the azimuthal direction, with an angular momentum distribution very close to that corresponding to solid-body rotation for about the inner-half radius. The differential rotation sets up a large-scale circulation that is primari...
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Transition research under NASA’s Aeronautical Sciences Project seeks to develop a validated set of variable fidelity prediction tools with known strengths and limitations, so as to enable “sufficiently” accurate transition prediction and practical transition control for future vehicle concepts. This paper builds upon prior effort targeting the laminar breakdown mechanisms associated with statio...
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Laminar-turbulent transition in a 3-D boundary layer under controlled simultaneous forcing of unstable steady and unsteady crossflow waves is investigated by means of direct numerical simulations. The flow configuration reproduces the accelerated 3-D flat-plate boundary layer of the ”Querstr ömungsprinzipexperiment”of the DLRG öttingen [1]. The superposition of high-amplitude steady and unstead...
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The influence of localized blowing and suction on the secondary instability of highamplitude crossflow vortices (CFVs) has been investigated by means of direct numerical simulations (DNS). The growth of artificially excited high-frequency disturbances is significantly attenuated or even neutralized by blowing or suction at the wall. Two different effects have been found during the investigation...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2018
ISSN: 0022-1120,1469-7645
DOI: 10.1017/jfm.2018.253