NDLI: Lateral Spreading Mechanism of a Turbulent Spot and a Turbulent Wedge

Content Provider	Springer Nature Link
Author	Goldstein, David Chu, Jeff Brown, Garry
Copyright Year	2016
Abstract	We examine the spreading of turbulent spots and wedges into a surrounding laminar Blasius boundary layer. The spreading is not due to the lateral propagation of turbulent eddies but rather to a developing disturbance in the surrounding spanwise vorticity of the laminar boundary layer. We concentrate on the mechanisms for generating streamwise vorticity. In particular, inclined generally streamwise vortex tubes along the spot/wedge boundary tilt mean shear vortex lines either up or down. These lines subsequently tend to either lag back or lead forward. As the leading or lagging vortex lines continue to wrap around and reinforce the causative inclined tube, the lines arch up or down. The outboard portion of the resulting arch must acquire a vertical, ωy, component of vorticity which induces the rollup of a new inclined tube now outboard of the first. Close to the wall the arching mechanism is inhibited by the no through flow boundary condition while far from the wall the process is inhibited by the lack of sufficient mean spanwise vorticity.
Starting Page	21
Ending Page	35
Page Count	15
File Format	PDF
ISSN	13866184
Journal	Flow, Turbulence and Combustion
Volume Number	98
Issue Number	1
e-ISSN	15731987
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-07-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Turbulent wedge Turbulent spot Roughness-induced transition Boundary layer transition Engineering Fluid Dynamics Fluid- and Aerodynamics Engineering Thermodynamics, Heat and Mass Transfer Automotive Engineering
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry Chemical Engineering

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