Using Brownian dynamics simulations, we investigate the response to shear of a two-dimensional system of quasi-hard disks that are confined in the velocity gradient direction by a smooth external potential. Shearing the confined system leads to a homogenization of the one-body density profile. In order to rationalize this deconfinement effect, we split the internal one-body force field into adiabatic and superadiabatic contributions. We demonstrate that the superadiabatic force field consists of viscous and of structural contributions. We give an empirical scaling law that yields results for the superadiabatic force profiles both in the flow and in the gradient direction, in excellent agreement with the simulation data.

中文翻译：

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剪切引起的硬盘解除限制

使用布朗动力学模拟，我们研究了准硬盘的二维系统对剪切的响应，这些系统被平滑的外部势限制在速度梯度方向上。剪切受限系统会导致一体式密度分布均匀化。为了使这种解除限制效应合理化，我们将内部一体力场分为绝热和超绝热贡献。我们证明了超绝热力场由粘性和结构贡献组成。我们给出了一个经验标度定律，该定律产生了流动和梯度方向上的超绝热力分布的结果，与模拟数据非常吻合。