A yarn has a flexible structure whose axial length is very long compared its diameter. When loose yarn twists at its end, the yarn intertwines with itself as shown in Fig.1 to produce a shape called a snarl shape with motion referred to as snarl motion. The snarl shape sometimes cuts the yarn or reduces the yarn quality, and may reduce the productivity of textile machinery. As a preliminary step of handling snarl motion in the processes of textile machinery, this paper extends functions of a yarn model proposed in our previous study by appending a contact force and implementing a multithread computing method for fast simulation. The paper validates the yarn model by comparing the results of numerical simulation and experiment. Six-threads computing can make calculation at 5 times the rate possible with single-thread computing.
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