Materials Science and Nanotechnology

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Materials Science and Nanotechnology 44 7897 074717

Vortex Stretching Open Access Journals

Vortex stretching is at the core of the statement of the turbulence energy cascade from the bigger scales to the small scales in turbulence. In general, in turbulence fluid elements are more extended than squeezed, on average. In the end, this issue in more vortex stretching than vortex squeezing. For incompressible flow due to volume conservation of fluid elements, the lengthening implies thinning of the fluid elements in the directions perpendicular to the stretching direction. This decreases the radial size scale of the connected vorticity. At last, at the small scales of the order of the Kolmogorov microscales, the turbulence kinetic energy is degraded into heat through the action of molecular viscosity.

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