Journal article
Cause-and-effect of linear mechanisms sustaining wall turbulence
A Lozano-Durán, NC Constantinou, MA Nikolaidis, M Karp
Journal of Fluid Mechanics | Published : 2021
DOI: 10.1017/jfm.2020.902
Abstract
Despite the nonlinear nature of turbulence, there is evidence that part of the energy-transfer mechanisms sustaining wall turbulence can be ascribed to linear processes. The different scenarios stem from linear stability theory and comprise exponential instabilities, neutral modes, transient growth from non-normal operators and parametric instabilities from temporal mean flow variations, among others. These mechanisms, each potentially capable of leading to the observed turbulence structure, are rooted in simplified physical models. Whether the flow follows any or a combination of them remains elusive. Here, we evaluate the linear mechanisms responsible for the energy transfer from the strea..
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Grants
Awarded by Horizon 2020 Framework Programme
Funding Acknowledgements
This work was supported by the Coturb project of the European Research Council (ERC-2014.AdG-669505) during the 2019 Coturb Turbulence Summer Workshop at the Universidad Politecnica de Madrid. M.-A.N. acknowledges the support of the Hellenic Foundation for Research and Innovation, and the General Secretariat for Research and Technology (grant number 1718/14518). A.L.-D. acknowledges the support of the NASA Transformative Aeronautics Concepts Program (grant number NNX15AU93A) and the Office of Naval Research (grant number N000141712310). N.C.C. was supported by the Australian Research Council (grant number CE170100023). M.K. was supported by the Air Force Office of Scientific Research under grant FA9550-16-1-0319 and the Office of Naval Research under grant N00014-17-1-2341.