Quadrant analysis of persistent spatial velocity perturbations over square-bar roughness |
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Authors: | Dubravka Pokrajac Lorna Jane Campbell Vladimir Nikora Costantino Manes Ian McEwan |
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Institution: | (1) Department of Engineering, University of Aberdeen, Aberdeen, AB24 3UE, UK |
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Abstract: | We explore a new application of the quadrant method in the context of the double-averaged Navier–Stokes equations for studying
open channel flow near rough beds. Quadrant analysis is applied to spatial disturbances of time-averaged velocity components,
using the experimental data from flow over two-dimensional regular transverse square-bar roughness. The spatial velocity disturbances
change periodically performing a full cycle over a single roughness element, so that the quadrant diagrams are regular closed
orbits. A colour code is used to produce a quadrant map of the flow cross-section, which reveals contributions from each quadrant
to the time-averaged momentum transfer. |
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Keywords: | |
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