Abstract
The Poisson equation for pressure, together with the evolutions equations for the velocity gradients, reveals the role of vorticity in generation of pressure sources. Specifically, it was shown how a pressure field created by a local source, acting on nearby vorticity, would create new pressure sources. It was further established that a moving pressure field, which moves with the velocity of its source, but extends well beyond the source location, could lead to generation of fast and slow streaks as wells as contribute to formation of flow structures in the wall region. These processes, which are part of central mechanisms of maintenance of turbulence, suggest that turbulence could be self-sustaining only if the perturbation pressure force could overcome the diffusion effects; the value of friction Reynolds number reflects the balance between the two.
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References
Kim, J.: On the structure of pressure fluctuations in simulated turbulent channel flow. J. Fluid Mech. 205, 421–451 (1989)
Mikic, B.B., Kapat, J.S., Ratnathicam, J.: Transition to turbulence in systems with eddy promoters: implication for the question of transition. Phys. Fluids A 4(9), 1854–1855 (1992)
Mikic, B.B., Vujisic, L.J.B., Kapat, J.S.: Turbulent transition and maintenance of turbulence; implication to heat transfer augmentation. Int. J. Heat Mass Tran. 37(Supl. 1), 425–431 (1994)
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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Mikic, B. Role of Vorticity in Generation of Pressure Sources and its Implication for Maintenance of Turbulence. Flow Turbulence Combust 89, 329–334 (2012). https://doi.org/10.1007/s10494-012-9397-9
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DOI: https://doi.org/10.1007/s10494-012-9397-9