We numerically and theoretically investigate how the softness of particles affects the rheology of sheared dilute granular gases. We find that the kinetic theory predicts the deviation of the flow curve from the Bagnold scaling, and it works well below a certain shear rate when we compare with the simulation results. It is also found that there is no theoretical solution above this shear rate, which is because the energy loss due to inelastic collisions cannot be balanced with the energy injection by the shear.

中文翻译：

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颗粒柔软度对稀颗粒气体流变学的影响

我们在数值上和理论上研究了颗粒的柔软度如何影响剪切稀颗粒气体的流变性。我们发现动力学理论预测了流量曲线与Bagnold比例的偏差，并且在与模拟结果进行比较时，它在低于一定剪切速率的情况下也能很好地工作。还发现在该剪切速率之上没有理论解，这是因为由于非弹性碰撞引起的能量损失不能与通过剪切的能量注入相平衡。