[HTML][HTML] Lectures on turbulence

R Benzi, F Toschi - Physics Reports, 2023 - Elsevier
Fluid dynamics turbulence refers to the chaotic and unpredictable dynamics of flows.
Despite the fact that the equations governing the motion of fluids are known since more than …

Polymer drag reduction: A review through the lens of coherent structures in wall-bounded turbulent flows

Z Saeed, BR Elbing - Physics of Fluids, 2023 - pubs.aip.org
The current work qualitatively surveys the phenomenon of polymer drag reduction from the
standpoint of the salient coherent motions in the near-wall region of wall-bounded turbulent …

Inertial enhancement of the polymer diffusive instability

MMP Couchman, M Beneitez, J Page… - Journal of Fluid …, 2024 - cambridge.org
Beneitez et al.(Phys. Rev. Fluids, vol. 8, 2023, L101901) have recently discovered a new
linear 'polymer diffusive instability'(PDI) in inertialess rectilinear viscoelastic shear flow using …

Purely elastic turbulence in pressure-driven channel flows

M Lellep, M Linkmann… - Proceedings of the …, 2024 - National Acad Sciences
Solutions of long, flexible polymer molecules are complex fluids that simultaneously exhibit
fluid-like and solid-like behavior. When subjected to an external flow, dilute polymer …

Linear stability analysis of purely elastic travelling-wave solutions in pressure-driven channel flows

M Lellep, M Linkmann, A Morozov - Journal of Fluid Mechanics, 2023 - cambridge.org
Recent studies of pressure-driven flows of dilute polymer solutions in straight channels
demonstrated the existence of two-dimensional coherent structures that are disconnected …

Asymptotics of the centre-mode instability in viscoelastic channel flow: with and without inertia

RR Kerswell, J Page - Journal of Fluid Mechanics, 2024 - cambridge.org
Motivated by the recent numerical results of Khalid et al.(Phys. Rev. Lett., vol. 127, 2021,
134502), we consider the large-Weissenberg-number (neutral curve, confirming the inferred …

Turbulent Taylor–Couette flow of dilute polymeric solutions: a 10-year retrospective

J Song, Y Zhu, F Lin, N Liu… - … Transactions of the …, 2023 - royalsocietypublishing.org
This retrospective aims to present a coherent history of important findings in direct numerical
simulations and experiments in turbulent Taylor–Couette (TC) flow of dilute polymeric …

[HTML][HTML] The role of polymer parameters and configurations in drag-reduced turbulent wall-bounded flows: Comparison between FENE and FENE-P

F Serafini, F Battista, P Gualtieri, CM Casciola - International Journal of …, 2023 - Elsevier
Polymer-laden turbulent pipe flows are investigated through direct numerical simulations
with Lagrangian transport, and back reaction, of 1 0 8 polymers, modelled as FENE …

Multistability of elasto-inertial two-dimensional channel flow

M Beneitez, J Page, Y Dubief… - Journal of Fluid …, 2024 - cambridge.org
Elasto-inertial turbulence (EIT) is a recently discovered two-dimensional chaotic flow state
observed in dilute polymer solutions. Two possibilities are currently hypothesized to be …

Effect of polymer additives on dynamics of water level in an open channel

M Kumar, MD Graham - Journal of Non-Newtonian Fluid Mechanics, 2023 - Elsevier
The presence of a tiny amount of polymers (a few parts per million) in a fluid dramatically
reduces turbulent drag. For this reason, polymer additives have been proposed to be used …