Internal Boundary Layer Scaling for Roughness Transitions in Turbulent Flows

Autor:	Cooke, Justin P., Park, George I., Jerolmack, Douglas J., Arratia, Paulo E.
Rok vydání:	2024
Předmět:	Physics - Fluid Dynamics
Druh dokumentu:	Working Paper
Popis:	When turbulent boundary layer flows encounter abrupt roughness changes, an Internal Boundary Layer (IBL) forms. Equilibrium theory breaks down in the nonequilibrium IBL, which may extend O(10) km for natural atmospheric flows. Here, we find that the IBL possesses a characteristic time-scale associated with the IBL height, ${\delta}_i$. We show that ${\delta}_i$ and the edge velocity set the scales of the mean and defect velocity profiles within the IBL, for simulation and experimental data covering a multitude of roughness transition types. We present a nontrivial extension of equilibrium theory to the dynamically adjusting IBL, which can be useful for modeling a range of environmental and industrial flows. Comment: 6 Pages, 4 Figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2411.08705 Zobrazit plný text záznamu View this record from Arxiv