The low shear rate interfacial slip behaviors of nonentangled bead–spring polymer melts are firstly simulated using a multiscale method without constitutive relations and wall slip hypotheses. Two orders of magnitude less computation compared with pure molecular dynamics simulations offers the present multiscale method unique capability to resolve the low shear rate slip problems for complex fluids, and to explore the impacts of bulk viscosity and interfacial friction coefficient on slip phenomenon detailedly. Variation of wall–fluid interaction (WFI) can lead to completely opposite trends of rate-dependent slip. For weak WFI, two distinct slip regimes including rate-independent regime and rapid increase regime can be found due to the competition between bulk viscosity and interfacial friction coefficient. For moderate WFI, the complete dominance of the bulk viscosity leads to a linear relation between the slip length and the bulk viscosity and two distinct regimes composed of rate-independent regime and rapid decrease regime.

非缠结的珠-弹簧聚合物熔体的低剪切速率界面滑移行为首先是使用无本构关系和壁滑假说的多尺度方法模拟的。与纯分子动力学模拟相比，计算量减少了两个数量级，从而提供了当前的多尺度方法独特的功能，可以解决复杂流体的低剪切速率滑移问题，并详细研究体积粘度和界面摩擦系数对滑移现象的影响。壁-流体相互作用（WFI）的变化可能导致速率依赖性滑移的趋势完全相反。对于弱WFI，由于体积粘度和界面摩擦系数之间的竞争，可以找到两种不同的滑移机制，包括速率无关机制和快速增加机制。对于中等WFI，