OCCURRENCE OF INTERMITTENCY IN A LAMINAR-TURBULENT TRANSITION IN A PLANE COUETTE FLOW
DOI:
https://doi.org/10.5902/2179460X20258Keywords:
Laminar-turbulent transition. Intermittency. Stable boundary layer. Large eddy simulation.Abstract
The transition from laminar-turbulent flow regime is important in most of the fluid mechanics application areas. In the planetary boundary layer (PBL), the flow is predominantly turbulent. However, shortly after sunset, the incidence of solar radiation ceases and the surface begins to lose heat through the emission of long-wave, yielding in a thermical stratified stable boundary layer (SBL), where turbulence can be suppressed in almost all scales. Under these conditions the production of turbulence is predominantly mechanical, and at nights with strong stratification, the turbulent activity is reduced by several orders of magnitude and can rise abruptly in unpredictable ways, giving origin to a phenomenon known as global intermittency. The globla intermittency is a phenomenon that occurs in the transition flow in the PBL, similarly to intermittency which occurs in the laminar-turbulent transition. Thus, this work aims to develop a numerical experiment to reproduce the laminar-turbulent transition in a thermally stratified Couette flow, using a large eddy simulation model. The simulations show that for a certain range of parameters during the transition laminar-turbulent, turbulence appeared intermittently in the flow.
Downloads
References
Acevedo, O. C., Costa, F. D., Degrazia, G. A. (2012). The coupling state of an idealized stable boundary layer. Boundary-layer meteorology, 145(1), 211–228.
Arya, P. S. (2001). Introduction to micrometeorology, vol 79. Academic press.
Bergman, T. L., Incropera, F. P., Lavine, A. S. (2011). Fundamentals of heat and mass transfer. John Wiley & Sons.
Lagha, M., Manneville, P. (2007). Modeling of plane couette flow. i. large scale flow around turbulent spots. Physics of Fluids (1994-present), 19(9), 094,105.
Mahrt, L., Vickers, D. (2006). Extremely weak mixing in stable conditions. Boundary-layer meteorology, 119(1), 19–39.
Martinez, D. M. V. (2006). Transição à turbulência na camada de mistura estavelmente estratificada utilizando simulação numérica direta e simulação de grandes escalas.
Nieuwstadt, F. T. (1984). The turbulent structure of the stable, nocturnal boundary layer. Journal of the Atmospheric Sciences, 41(14), 2202–2216.
Pirro, D., Quadrio, M. (2008). Direct numerical simulation of turbulent taylor–couette flow. European Journal of Mechanics-B/Fluids, 27(5), 552–566.
Rieth, M., Proch, F., Stein, O., Pettit, M., Kempf, A. (2014). Comparison of the sigma and smagorinsky les models for grid generated turbulence and a channel flow. Computers & Fluids, 99, 172–181.
Schlichting, H., Gersten, K., Gersten, K. (2000). Boundary layer theory. Springer Science & Business Media.
Stull, R. B. (1988). An introduction to boundary layer meteorology, vol 13. Springer Science & Business Media.
Sun, J., Mahrt, L., Banta, R. M., Pichugina, Y. L. (2012). Turbulence regimes and turbulence intermittency in the stable boundary layer during cases-99. Journal of
the Atmospheric Sciences, 69(1), 338–351.
White, F. (2015). Fluid mechanics. McGraw-Hill Higher Education.
Downloads
Published
How to Cite
Issue
Section
License
To access the DECLARATION AND TRANSFER OF COPYRIGHT AUTHOR’S DECLARATION AND COPYRIGHT LICENSE click here.
Ethical Guidelines for Journal Publication
The Ciência e Natura journal is committed to ensuring ethics in publication and quality of articles.
Conformance to standards of ethical behavior is therefore expected of all parties involved: Authors, Editors, Reviewers, and the Publisher.
In particular,
Authors: Authors should present an objective discussion of the significance of research work as well as sufficient detail and references to permit others to replicate the experiments. Fraudulent or knowingly inaccurate statements constitute unethical behavior and are unacceptable. Review Articles should also be objective, comprehensive, and accurate accounts of the state of the art. The Authors should ensure that their work is entirely original works, and if the work and/or words of others have been used, this has been appropriately acknowledged. Plagiarism in all its forms constitutes unethical publishing behavior and is unacceptable. Submitting the same manuscript to more than one journal concurrently constitutes unethical publishing behavior and is unacceptable. Authors should not submit articles describing essentially the same research to more than one journal. The corresponding Author should ensure that there is a full consensus of all Co-authors in approving the final version of the paper and its submission for publication.
Editors: Editors should evaluate manuscripts exclusively on the basis of their academic merit. An Editor must not use unpublished information in the editor's own research without the express written consent of the Author. Editors should take reasonable responsive measures when ethical complaints have been presented concerning a submitted manuscript or published paper.
Reviewers: Any manuscripts received for review must be treated as confidential documents. Privileged information or ideas obtained through peer review must be kept confidential and not used for personal advantage. Reviewers should be conducted objectively, and observations should be formulated clearly with supporting arguments, so that Authors can use them for improving the paper. Any selected Reviewer who feels unqualified to review the research reported in a manuscript or knows that its prompt review will be impossible should notify the Editor and excuse himself from the review process. Reviewers should not consider manuscripts in which they have conflicts of interest resulting from competitive, collaborative, or other relationships or connections with any of the authors, companies, or institutions connected to the papers.
