I would like to determine the area and the pressure distribution of a footprint of a tire. I managed to create a python script which delivers me the variables of a node set covering the arround the complete circumference of the tread surface. The node set contains 4080 nodes. For the CNAREA variable I get 4080 results, for the CPRESS variable I get 8160. I have three questions:

1. Why are there double as much values for the amount of nodes for the CPRESS variable

2. How to select/distuingish between the values of CPRESS I need for analysis and what are the other values?

3. Is there a more sufficient way to determine the footprint area (sum of CNAREA values greater than zero), mean pressure, and so on?