标题： 一种相场方法用于耗散粒子动力学及其他粒子模型在几何结构复杂的受限系统中流体流动的无滑移边界条件 显示英文标题

标题： A phase field approach to no slip boundary conditions in dissipative particle dynamics and other particle models for fluid flow in geometrically complex confined systems

摘要： 耗散粒子动力学（DPD）是一种有效的介观粒子模型，由于采用了软势能，其计算成本低于分子动力学。 然而，软势能不足以防止用于表示流体的DPD粒子穿透由静止DPD粒子表示的固体边界。 一个相场变量，，用于在点和时间t指示相，界面处从-1（相1）平滑过渡到+1（相2）。 我们描述了在DPD模型中一种高效的无滑移边界条件实现，该实现结合了固液粒子间相互作用与在使用相场确定的亚网格尺度精度的尖锐边界处的反射。 这种方法可用于任意复杂的流动几何结构和其他类似的粒子模型（如光滑粒子流体力学），并通过受限系统中不同几何结构的DPD模拟验证了该模型的有效性。 显示英文摘要

摘要： Dissipative particle dynamics (DPD) is an effective mesoscopic particle model with a lower computational cost than molecular dynamics because of the soft potentials that it employs. However, the soft potential is not strong enough to prevent the DPD particles that are used to represent the fluid from penetrating solid boundaries represented by stationary DPD particles. A phase field variable, , is used to indicate the phase at point and time t, with a smooth transition from -1 (phase 1) to +1 (phase 2) across the interface. We describe an efficient implementation of no-slip boundary conditions in DPD models that combines solid-liquid particle-particle interactions with reflection at a sharp boundary located with subgrid scale accuracy using the phase field. This approach can be used for arbitrarily complex flow geometries and other similar particle models (such as smoothed particle hydrodynamics), and the validity of the model is demonstrated by DPD simulations of flow in confined systems with various geometries.