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arXiv 0810.4139cond-mat.softcond-mat.stat-mech
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复杂流体在平衡和剪切下的粗粒模型

Coarse-grained models of complex fluids at equilibrium and unter shear

Friederike Schmid

摘要:

复杂的流体在很宽的长度和时间尺度上表现出结构,并且有必要采用分层方法来研究其通常不寻常的属性的所有方面。在不同的粗粒化水平上对理想化粗粒模型的研究可以提供对平衡态和非平衡态的一般结构和基本动力学过程的深入了解。在本讲座的第一部分,一些流行的膜和膜系统的粗粒度模型进行了审查。特别关注的是珠弹簧模型与不同的溶剂表示,并随机接口模型。在分子和介观水平上的模拟选定的例子,它示出了如何模拟分子粗粒度模型可以在不同的水平之间的桥梁。第二部分介绍了复杂流体剪切作用下的模拟方法。在简要介绍了唯象学(特别是液晶)之后,介绍了不同的非平衡分子动力学(NEMD)方法,并进行了比较。应用实例包括剪切下液晶界面和层状表面活性剂相的行为。最后简要讨论了液晶在剪切作用下的介观模拟方法。

英文摘要:

Complex fluids exhibit structure on a wide range of length and time scales, and hierarchical approaches are necessary to investigate all facets of their often unusual properties. The study of idealized coarse-grained models at different levels of coarse-graining can provide insight into generic structures and basic dynamical processes at equilibrium and non-equilibrium. In the first part of this lecture, some popular coarse-grained models for membranes and membrane systems are reviewed. Special focus is given to bead-spring models with different solvent representations, and to random-interface models. Selected examples of simulations at the molecular and the mesoscopic level are presented, and it is shown how simulations of molecular coarse-grained models can bridge between different levels. The second part addresses simulation methods for complex fluids under shear. After a brief introduction into the phenomenology (in particular for liquid crystals), different non-equilibrium molecular dynamics (NEMD) methods are introduced and compared to one another. Application examples include the behavior of liquid crystal interfaces and lamellar surfactant phases under shear. Finally, mesoscopic simulation approaches for liquid crystals under shear are briefly discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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