Beyond the maximum drag reduction asymptote: the pseudo-laminar state
Fluid Dynamics
2019-11-04 v1
Abstract
Recent experiments indicated that polymers can reduce the turbulent drag beyond the asymptotic limit known as the MDR, leading to a laminar flow. In this Letter, we show through direct numerical simulations that, when the MDR is exceeded, the flow can remain in a laminar-like regime for a very long period without being truly laminar. During this period called pseudo-laminar state, a transient behavior is observed as a consequence of a small rate of polymer energy injected into the flow. Later on, flow instabilities develop across the channel, finally triggering elastoinertial turbulence.
Keywords
Cite
@article{arxiv.1911.00439,
title = {Beyond the maximum drag reduction asymptote: the pseudo-laminar state},
author = {Anselmo Pereira and Roney L. Thompson and Gilmar Mompean},
journal= {arXiv preprint arXiv:1911.00439},
year = {2019}
}