Year: 2026
Type: preprint
Abstract: Experiments on the regeneration of long streaks in flows in which they had originally been damped show that their initial growth is due to the interaction of the mean shear with long cross-flow velocities (rollers) that remain even when the streaks are damped. More surprisingly, turbulence also persists in simulations in which only the long rollers are damped while long streaks remain, and these flows are also able to recover when the damping is removed. Finally, simulations are presented in which both streaks and rollers longer than $λ_x^+ \approx 600$ are damped. They survive and regenerate, and an interpretation in terms of their energy balance is provided. In contraposition to the classical minimal channels, which include infinitely long structures, these new flows do not contain features longer than the damping wavelength, and support a model in which wall turbulence only depends on processes for which the geometric aspect ratio is of order unity.
Source: arXiv (Cornell University)
Authors: Lopez, Carlos Martinez, Jimenez, Javier
Institution: Universidad Politécnica de Madrid
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7168145481
Cites:
Cited by:
Related to: