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Effect of random roughness on Stokes flow

Published online by Cambridge University Press:  25 November 2024

Gerardo Severino Open the ORCID record for Gerardo Severino [Opens in a new window]
Gerardo Severino*
Affiliation:
Division of Water Resources Management, University of Naples - Federico II, via Universitá 100, Portici, I80055 NA, Italy
*
†Email address for correspondence: [email protected]
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Abstract

Microscopic irregularity (roughness) of bounding surfaces affects macroscopic dynamics of fluid flows. Its effect on bulk flow is usually quantified empirically by means of a roughness coefficient. A new approach, which treats rough surfaces (e.g. parallel plates) as random fields whose statistical properties can be inferred from measurements, is presented. The mapping of a random flow domain onto its deterministic counterpart, and the subsequent stochastic averaging of the transformed Stokes equations, yield expressions for the effective viscosity and roughness coefficient in terms of the statistical characteristics of the irregular geometry of the boundaries. The analytical nature of the solutions allows one to handle surface roughness characterized by short correlation lengths, a challenging feature for numerical stochastic simulations.

JFM classification

Low-Reynolds-number flows: Stokesian dynamics
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 1000 , 10 December 2024 , R1
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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