Distance of closest approach of two arbitrary hard ellipses in 2D

Details Distance of closest approach of two arbitrary hard ellipses in 2D Distance of closest approach of two arbitrary hard ellipses in 2D

2009-11-17

arxiv.org/abs/0911.3420v1

Phy. Rev. E, 75, 061709 (2007)

Physics

Mathematical Physics

22 pages, 4 figures. Appeared in PRE, 2007. This version includes additional information about coordinates of contact point, a

Scientific paper

10.1103/PhysRevE.75.061709

The distance of closest approach of hard particles is a key parameter of their interaction and plays an important role in the resulting phase behavior. For non-spherical particles, the distance of closest approach depends on orientation, and its calculation is surprisingly difficult. Although overlap criteria have been developed for use in computer simulations [1, 2], no analytic solutions have been obtained for the distance of closest approach of ellipsoids in 3-D, or, until now, for ellipses in 2-D. We have derived an analytic expression for the distance of closest approach of the centers of two arbitrary hard ellipses as function of their orientation relative to the line joining their centers. We describe our method for solving this problem, illustrate our result, and discuss its usefulness in modeling and simulating systems of anisometric particles such as liquid crystals.

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