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Figure 12


Fig. 12. Definition of three kinds of angles, where e1 and e2 are the orientation vectors of cell 1 and 2, respectively. {theta}in is the angle between e1,in and e2,in when two cells surfaces are at a distance of L before the collision. {theta}out is the angle between e1,out and e2,out when two cell surfaces are at a distance of L after the collision. In order to describes the change of orientation of cell 2 relative to cell 1, a frame is fixed to cell 1 so that the frame rotates when cell 1 rotates, and d{theta} is defined as change in the angle of cell 2 relative to this rotating frame.





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