Email this article EXPERIMENTAL STUDY OF THE NON-MODAL PERTURBATION GROWTH MECHANISM IN A LAMINAR SUBMERGED JET
- Authors: Ashurov D.A.1, Vedeneev V.V.1, Gareev L.R.1, Ivanov O.O.1
-
Affiliations:
- Institute of Mechanics, Lomonosov Moscow State University
- Issue: Vol 509, No 1 (2023)
- Pages: 28-38
- Section: МЕХАНИКА
- URL: https://kld-journal.fedlab.ru/2686-7400/article/view/651878
- DOI: https://doi.org/10.31857/S2686740023010029
- EDN: https://elibrary.ru/OXONJF
- ID: 651878
Cite item
Open Access
Access granted
Subscription Access
Abstract
It is known that in wall-bounded flows, along with the growth of instability modes, the non-modal (algebraic) mechanism of linear growth plays an important role. In open flows, including submerged jets, the non-modal growth mechanism is theoretically studied only in the last decade; this mechanism has not yet been identified in experiments. In the present work, experiments on excitation of a non-modal “lift-up” growth mechanism are conducted. Special wavy structures (deflectors) are introduced into a laminar submerged jet of circular cross section, which excites a roller-like transverse movement. The data obtained unambiguously identify the non-modal “lift-up” growth of introduced disturbances. The development of perturbations in the experiment qualitatively corresponds to the theoretically calculated optimal perturbations. The features of the transition to turbulence caused by non-modal growth are considered.
About the authors
D. A. Ashurov
Institute of Mechanics, Lomonosov Moscow State University
Author for correspondence.
Email: ashurovda@my.msu.ru
Russia, Moscow
V. V. Vedeneev
Institute of Mechanics, Lomonosov Moscow State University
Author for correspondence.
Email: vasily@vedeneev.ru
Russia, Moscow
L. R. Gareev
Institute of Mechanics, Lomonosov Moscow State University
Author for correspondence.
Email: gareev.lr@yandex.ru
Russia, Moscow
O. O. Ivanov
Institute of Mechanics, Lomonosov Moscow State University
Author for correspondence.
Email: ivanov@imec.msu.ru
Russia, Moscow
References
- Зайко Ю.С., Решмин А.И., Тепловодский С.Х., Чичерина А.Д. Исследование затопленных струй с увеличенной длиной начального ламинарного участка // Изв. РАН. МЖГ. 2018. № 1. С. 97–106.
- Zayko J., Teplovodskii S., Chicherina A., Vedeneev V., Reshmin A. Formation of free round jets with long laminar regions at large Reynolds numbers // Phys. Fluids. 2018. V. 30. 043603.
- Зайко Ю.С., Гареев Л.Р., Чичерина А.Д., Трифонов В.В., Веденеев В.В., Решмин А.И. Экспериментальное обоснование применимости линейной теории устойчивости к затопленной струе // Доклады РАН. Физика, технические науки. 2021. Т. 497. С. 44–48.
- Gareev L.R., Zayko J.S., Chicherina A.D., Trifonov V.V., Reshmin A.I., Vedeneev V.V. Experimental validation of inviscid linear stability theory applied to an axisymmetric jet // J. Fluid Mech. 2022. V. 934. A3.
- Farrell B.F., Ioannou P.J. Optimal excitation of three-dimensional perturbations in viscous constant shear flow // Phys. Fluids A. 1993. V. 5. P. 1390–1400.
- Andersson P., Berggren M., Henningson D.S. Optimal disturbances and bypass transition in boundary layers // Phys. Fluids. 1999. V. 11. № 1. P. 134–150.
- Matsubara M., Alfredsson P. H. Disturbance growth in boundary layers subjected to free-stream turbulence // J. Fluid Mech. 2001. V. 430. P. 149–168.
- Boronin S.A., Healey J.J., Sazhin S.S. Non-modal stabillity of round viscous jets // J. Fluid Mech. 2013. V. 716. P. 96–119.
- Jimenez-Gonzalez J.I., Brancher P., Martinez-Bazan C. Modal and non-modal evolution of perturbations for parallel round jets // Physics of Fluids. 2015. V. 27. № 4. 044105.
- Jimenez-Gonzalez J.I., Brancher P. Transient energy growth of optimal streaks in parallel round jets // Physics of Fluids. 2017. V. 29. № 11. 114101.
- Canuto C., Hussaini M.Y., Quarteroni A., Zang T.A. Spectral Methods. Springer-Verlag Berlin, Heidelberg, 2007. 581 p.
Supplementary files
