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Seamless multiscale modeling of complex fluids using fiber bundle dynamics

机译:使用纤维束动力学对复杂流体进行无缝多尺度建模

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摘要

We present a seamless multiscale model and an efficient coupling scheme for the study of complex fluids. The multiscale model consists of macroscale conservation laws for mass and momentum, molecular dynamics on fiber bundles, as well as the Irving-Kirkwood formula which links the macroscale stress tensor with the microscopic variables. The macroscale and microscale models are solved with a macro time step and a micro time step respectively. The two models are synchronized at each time step by exchanging the velocity gradient (from macro to micro) and the stress tensor (from micro to macro). The multiscale method is applied to study the dynamics of polymer fluids in a channel driven by external forces.
机译:我们提出了一种无缝的多尺度模型和一种有效的耦合方案,用于研究复杂流体。多尺度模型由质量和动量的宏观守恒定律,纤维束上的分子动力学以及将宏观应力张量与微观变量联系起来的欧文-柯克伍德公式组成。宏观和微观模型分别用宏观时间步和微观时间步求解。通过交换速度梯度(从宏观到微观)和应力张量(从微观到宏观),两个模型在每个时间步同步。多尺度方法被用于研究外力驱动的通道中聚合物流体的动力学。

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