Experimental observation of flow instability control by metamaterial subsurfaces
Abstract
Flow instabilities within a fluid flow can cause laminar-to-turbulent transition over surfaces. These instabilities can result from upstream, wake-generating disturbances, leading to increased drag and turbulence-induced energy losses. Flow control strategies can address these issues through active methods, requiring energy input, or passive systems, which operate without added input. Here, we present a passive approach to flow control using embedded phononic metamaterials to alter vortex instability development, without changing the outer-surface's texture, roughness or compliance. Experiments confirm that our subsurface can suppress vortex growth at target frequencies, demonstrating the potential for energy-efficient flow management with phononic subsurfaces.
Keywords
Cite
@article{arxiv.2504.02053,
title = {Experimental observation of flow instability control by metamaterial subsurfaces},
author = {Melanie Keogh and Jensen McTighe and Jason Dahl and Osama R. Bilal},
journal= {arXiv preprint arXiv:2504.02053},
year = {2025}
}