Discussion of Hybrid Atomistic-Continuum Methods for Multiscale Hydrodynamics
Discussion of Hybrid Atomistic-Continuum Methods for Multiscale Hydrodynamics
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DOI：
10.1615/intjmultcompeng.v2.i2.20
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发表时间：
2004
影响因子：
1.4
通讯作者：
H. S. Wijesinghe;N. Hadjiconstantinou
中科院分区：
文献类型：
--
作者：
H. S. Wijesinghe;N. Hadjiconstantinou
讨论了多尺度水动力学应用的原子-连续介质混合方法。考虑了致密流体和稀气配方。强调了耦合方法的选择及其与流体物理的关系以及时间尺度解耦的必要性。特别是，通过将分子积分时间步长与CFL时间步长联系起来，我们表明可压缩性在确定耦合方法的选择方面是重要的。讨论并提出了适合不同流型的耦合技术。我们还讨论了最近发展的稀释气体不可压缩和可压缩混合方法。不可压缩框架基于Schwarz交替方法，该方法提供了时间尺度解耦；可压缩方法是一种多物种、完全自适应的网格和算法细化方法，它在网格细化的最精细水平上引入了直接模拟蒙特卡罗。*通讯作者。电子邮件地址：ngh@mit.edu 0731-8898/02/$5.00©2004 by Begell House, Inc. 1 hetithanthrige ET AL
We discuss hybrid atomistic-continuum methods for multiscale hydrodynamic applications. Both dense-fluid and dilute-gas formulations are considered. The choice of coupling method and its relation to the fluid physics as well as the need for timescale decoupling is highlighted. In particular, by relating the molecular integration timestep to the CFL timestep, we show that compressibility is important in determining the choice of a coupling method. Appropriate coupling techniques for various flow regimes are discussed and proposed. We also discuss recently developed incompressible and compressible hybrid methods for dilute gases. The incompressible framework is based on the Schwarz alternating method, which provides timescale decoupling; the compressible method is a multispecies, fully adaptive mesh and algorithm refinement approach that introduces the direct-simulation Monte Carlo at the finest level of mesh refinement. *Corresponding author. Email address: ngh@mit.edu 0731-8898/02/$5.00 © 2004 by Begell House, Inc. 1 2 HETTITHANTHRIGE ET AL