Yarn simulations with sharp edges

This paper describes a new method for collision handling of particle based systems moving on sharp edges using intermediate points and correction methods for particles passing these edges. It aims at facilitating the simulation of physically realistic movement of the particles in contact with surfaces, even if those surfaces contain sharp edges. The method was developed in order to increase the range of surfaces that allow valid simulations. The method has for the moment only been applied to the simulation of yarn, which is represented as a one-dimensional system of particles connected by springs and dampers. This could be extended however to two-dimensional systems such as cloth, although the technique is developed for explicit integration schemes. Validation has been done by comparing with surfaces with smoothed edges as well as by comparing with actual high speed camera results. From the results, it was shown that physically realistic movement of yarn over a sharp edge can now successfully be simulated.