b hH

flow direction b

■> y axis

x axis

Figure 9. Ellipsoidal Blockage

Drag coefficient data for ellipsoidal cylinders of varying eccentricities with transverse thickness Reynolds numbers around 1x105 from Lindsey (1938) and Delany and Sorensen (1953) are plotted in Figure 10. A function of eccentricity which best represented the data was found by determining the log-log regression curve of the form shown below.

Equation (8) was multiplied by the eccentricity function to yield a drag coefficient function accounting for the eccentricity of the roughness elements.

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