journal article
Oct 01, 2022
On Stokes' second problem solutions in cylindrical and Cartesian domains
Abstract
It is well known that drag created by turbulent flow over a surface can be reduced by oscillating the surface in the direction transverse to the mean flow. Efforts to understand the mechanism by which this occurs often apply the solution for laminar flow in the infinite half-space over a planar, oscillating wall (Stokes' second problem) through the viscous and buffer layer of the streamwise turbulent flow. This approach is used for flows having planar surfaces, such as channel flow, and flows over curved surfaces, such as the interior of round pipes. However, surface curvature introduces an additional effect that can be significant, especially when the viscous region is not small compared to the pipe radius. The exact solutions for flow over transversely oscillating walls in a laminar pipe and planar channel flow are compared to the solution of Stokes' second problem to determine the effects of wall curvature and/or finite domain size. It is shown that a single non-dimensional parameter, the Womersley number, can be used to scale these effects and that both effects become small at a Womersley number of greater than about 6.51, which is the Womersley number based on the thickness of the Stokes' layer of the classical solution.
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Metrics
5
Citations
35
References
Details
- Published
- Oct 01, 2022
- Vol/Issue
- 34(10)
Authors
Funding
National Science Foundation
Award: CBET-1944568
Cite This Article
Daniel J. Coxe, Yulia T. Peet, Ronald J. Adrian (2022). On Stokes' second problem solutions in cylindrical and Cartesian domains. Physics of Fluids, 34(10). https://doi.org/10.1063/5.0118838
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