We investigate why the two-phase boundary between the string and liquid phases is always oriented in a specific direction in non- equilibrium molecular-dynamics simulations of shear flow. We start simulations from a configuration of the two-phase boundary that is rotated 90^∘{} around the flow direction. It is confirmed that the original orientation found in simulations is more stable than the rotated orientation. In addition, a change from the rotated to the stable orientation is observed in one of our simulations.
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Yamada et al. (1990) studied this question.