The determination of form drag coefficient for rigid, emergent objects in open channel flow
Date
2017
Authors
Jackson, Kyle Sheldon
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The development of methods which are better able to predict the effect of large
scale emergent roughness elements on the flow characteristics requires a better
understanding of the drag coefficient under conditions likely to occur in the field.
A laboratory investigation was carried out with newly developed equipment to
quantify the drag force on various shaped cylinders, as well as the drag on an
individual cylinder surrounded by an array of cylinders. The relationship between
the drag coefficient and cylinder Reynolds number for a single circular cylinder
was found to be of similar form but larger in magnitude than the established
relationship for an infinitely long cylinder; the relationship departs from the infinite
cylinder relationship for low cylinder Reynolds numbers. Contrary to previous
research, the results for the multiple cylinder investigation did not reveal a clear
relationship between the cylinder density and drag coefficient. Equations were
developed and verified with existing laboratory data. These should be improved and
extended by further research for field use.
Description
A research report submitted to the Faculty of Engineering and the Built
Environment, University of the Witwatersrand, Johannesburg, in partial
fulfillment of the requirements for the degree of Master of Science in Engineering
Johannesburg, 2017
Keywords
Citation
Jackson, Kyle Sheldon (2017) The determination of form drag coefficient for rigid, emergent objects in open channel flow, University of the Witwatersrand, Johannesburg, <http://hdl.handle.net/10539/22962>