[kach22i]

Googled for images of bluff bodies in close proximity to ground plane.

ScienceDirect.com - International Journal of Heat and Mass Transfer - Heat transport from a bluff body near a moving wall at Re=100

ig. 4. Instantaneous contours of (a) vorticity (ω) and (b) isotherms at Re = 100 for various gap ratios, G/D, for the flow past a square cylinder near a plane moving wall. The isotherms are presented at the same instant of time for which the vorticity contours are drawn.

http://www.sciencedirect.com/science...45793011002726




http://www.sciencedirect.com/science...89974611000399




The all important corner vortex formation - see below.

Influence of the Slant Angle of 3D Bluff Bodies on Longitudinal Vortex Formation
http://fluidsengineering.asmedigital...icleid=1433689