NDLI: Topology of fine-scale motions in turbulent channel flow

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Topology of fine-scale motions in turbulent channel flow

Content Provider	Semantic Scholar
Author	Blackburn, By Hugh M. Mansour, N. N. Cantwell, Bradford W.
Copyright Year	2004
Abstract	An investigation of topological features of the velocity gradient field of turbulent channel flow has been carried out using results from a direct numerical simulation for which the Reynolds number based on the channel half-width and the centreline velocity was 7860. Plots of the joint probability density functions of the invariants of the rate of strain and velocity gradient tensors indicated that away from the wall region, the finescale motions in the flow have many characteristics in common with a variety of other turbulent and transitional flows: the intermediate principal strain rate tended to be positive at sites of high viscous dissipation of kinetic energy, while the invariants of the velocity gradient tensor showed that a preference existed for stable focus/stretching and unstable node/saddle/saddle topologies. Visualization of regions in the flow with stable focus/stretching topologies revealed arrays of discrete downstream-leaning flow structures which originated near the wall and penetrated into the outer region of the flow. In all regions of the flow, there was a strong preference for the vorticity to be aligned with the intermediate principal strain rate direction, with the effect increasing near the walls in response to boundary conditions.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://users.monash.edu.au/~bburn/pdf/JFM-BMC-96.pdf
Language	English
Access Restriction	Open
Subject Keyword	Acoustics Alignment Anatomy, Regional Buffers Computer simulation Control theory Direct numerical simulation Discriminant Downstream (software development) Flow Gradient Imagery Kinetics Motion Node - plant part Numerical analysis Portable Document Format Reynolds-averaged Navier–Stokes equations Thresholding (image processing) Turbulence Unstable Medical Device Problem Velocity (software development) Walls of a building width
Content Type	Text
Resource Type	Article

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