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A general strategy for designing seamless multiscale methods

机译:设计无缝多尺度方法的一般策略

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摘要

We present a new general framework for designing multiscale methods. Compared with previous work such as Brandt's systematic up-scaling, the heterogeneous multiscale method (HMM) and the "equation-free" approach, this new framework has the distinct feature that it does not require reinitializing the microscale model at each macro time step or each macro iteration step. In the new strategy, the macro- and micro-models evolve simultaneously using different time steps (and therefore different clocks), and they exchange data at every step. The micro-model uses its own appropriate time step. The macro-model runs at a slower pace than required by accuracy and stability considerations for the macroscale dynamics, in order for the micro-model to relax. Examples are discussed and application to modeling complex fluids is presented.
机译:我们提出了一种用于设计多尺度方法的新通用框架。与以前的工作(例如Brandt的系统放大,异构多尺度方法(HMM)和“无方程”方法)相比,该新框架的显着特点是不需要在每个宏观时间步长或重新初始化微观模型。每个宏迭代步骤。在新策略中,宏模型和微模型使用不同的时间步长(因此也使用不同的时钟)同时演化,并且在每一步都交换数据。微型模型使用自己的适当时间步长。宏模型的运行速度比宏观动力学的精度和稳定性考虑所需的速度慢,以便使微模型放松。讨论了示例,并介绍了在复杂流体建模中的应用。

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