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Non-modal perturbation growth in a laminar jet: an experimental study

Published online by Cambridge University Press:  15 May 2023

O.O. Ivanov Open the ORCID record for O.O. Ivanov [Opens in a new window] ,
D.A. Ashurov ,
L.R. Gareev Open the ORCID record for L.R. Gareev [Opens in a new window]  and
V.V. Vedeneev Open the ORCID record for V.V. Vedeneev [Opens in a new window]
O.O. Ivanov*
Affiliation:
Institute of Mechanics, Lomonosov Moscow State University, Moscow 119192, Russia
D.A. Ashurov
Affiliation:
Institute of Mechanics, Lomonosov Moscow State University, Moscow 119192, Russia Department of Mechanics and Mathematics, Lomonosov Moscow State University, Moscow 119991, Russia
L.R. Gareev
Affiliation:
Institute of Mechanics, Lomonosov Moscow State University, Moscow 119192, Russia Department of Mechanics and Mathematics, Lomonosov Moscow State University, Moscow 119991, Russia
V.V. Vedeneev
Affiliation:
Institute of Mechanics, Lomonosov Moscow State University, Moscow 119192, Russia Department of Mechanics and Mathematics, Lomonosov Moscow State University, Moscow 119991, Russia
*
†Email address for correspondence: ivanov@imec.msu.ru
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Abstract

It is known that, apart from the growth of instability modes, the non-modal (algebraic) mechanism of linear growth plays an important role in near-wall flows. In unbounded flows, including submerged jets, the theoretical analysis of the non-modal growth mechanism started only in the last decade; this mechanism has not yet been identified in experiments. In the present work, experiments were conducted on the excitation of a non-modal ‘lift-up’ growth mechanism. Special wavy structures (deflectors) were introduced into a laminar round submerged jet, which excited a roller-like transverse motion. Based on experimental results, we definitely identify the non-modal ‘lift-up’ growth mechanism 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.

JFM classification

Instability: Shear-flow instability Wakes/Jets: Jets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 963 , 25 May 2023 , A8
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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