Three indirect methods for characterizing the drag of an arbitrarily rough surface on a flat plate are derived or rederived from the similarity laws of turbulent shear flows. These are:
the well-known procedure using displacement thickness;
the probably not-so-well-known procedure using total drag; and
a proposed new procedure using only the freestream velocity and a local shear stress. The classical indirect procedure for pipe flow is also derived to show a commonality with the flat-plate methods.
Keywords:
smooth surface,
coefficient,
shear stress,
total drag,
granville,
roughness,
pipe,
Boundary Layer,
rough surface,
reynolds number
Subjects:
Reservoir Characterization
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1987. The Society of Naval Architects and Marine Engineers
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