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Abstract
The viscous drag on a slender rod by a wall is important to many biological and industrial systems. This drag critically depends on the separation between the rod and the wall and can be approximated asymptotically in specific regimes, namely far from, or very close to, the wall, but is typically determined numerically for general separations. In this article we determine an asymptotic representation of the local drag for a slender rod parallel to a wall which is valid for all separations. This is possible through matching the behavior of a rod close to the wall and a rod far from the wall. We show that the leading order drag in both these regimes has been known since 1981 and that they can be used to produce a composite representation of the drag which is valid for all separations. This is in contrast to a sphere above a wall, where no simple uniformly valid representation exists. We estimate the error on this composite representation as the separation increases, discuss how the results could be used as resistiveforce theory, and demonstrate their use on a twohinged swimmer above a wall.
Original language  English 

Article number  064101 
Pages (fromto)  064101106410116 
Number of pages  16 
Journal  Physical Review Fluids 
Volume  6 
Issue number  6 
DOIs  
Publication status  Published  Jun 2021 
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Dive into the research topics of 'Local drag of a slender rod parallel to a plane wall in a viscous fluid'. Together they form a unique fingerprint.Projects
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Fast predictive tools for suspensions of slender fibers in viscous fluids.
1/01/20 → 31/12/22
Project: Other