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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Formation of sand ripples under a turbulent liquid flow

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Franklin, Erick de Moraes
Total Authors: 1
Document type: Journal article
Source: Applied Mathematical Modelling; v. 39, n. 23-24, p. 7390-7400, DEC 2015.
Web of Science Citations: 1

Sand ripples are commonly observed in both nature and industry. For example, they are found on riverbeds and in oil pipelines that transport sand. In both natural and industrial cases, ripples increase friction between the bed and fluid and are related to flooding, high pressure drops, and transients. Ripples appear when sediments are entrained as bed load (a mobile granular layer) and are usually considered to be the result of initial bedforms that eventually saturate. Given the small aspect ratio of the initial bedforms, linear analyses can be used to understand the formation of ripples. This paper presents a linear stability analysis of a granular bed under a turbulent flow of a liquid. This analysis takes into consideration all the main mechanisms and parameters involved in the turbulent liquid case, including some important parameters that have not yet been considered together such as the bed compactness and the bed-load threshold shear stress. The results of this analysis are compared with published experimental results and they show good agreement. (C) 2015 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 12/19562-6 - The transport of grains as bed-load and the instabilities of a granular bed
Grantee:Erick de Moraes Franklin
Support type: Research Grants - Young Investigators Grants