Plot the properties of a surface on a graph

mat w

I have modelled and solved a pinned heat sink in a wind tunnel with air as the cooling fluid at various Reynolds numbers. I would now like to look at specific pins and find out how the separation point changes with row number. To do this I'd like to plot the circumferential distribution of the wall shear stress on each pin. The only problem is, the pins on the heat sink are not circular. Is there any smart way of getting this information without resorting to finding the data by hand and pointing and clicking on the postprocessing display? (I have about 20 cases to analyse)

Cheers for the help!