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arXiv physics/0204028physics.chem-phphysics.flu-dyn
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混合硬核/连续势的恒温分子动力学算法

Constant-temperature molecular-dynamics algorithms for mixed hard-core/continuous potentials

Yao A. Houndonougbo, Brian B. Laird

摘要:

本文提出了一套二阶、时间可逆的算法,用于混合硬核/连续势体系的等温(NVT)分子动力学(MD)模拟。这些方法是通过将实时Nose'恒温器与我们先前开发的碰撞Verlet算法[Mol. Phys.98,309(1999)]用于此类系统的恒定能量MD模拟。我们总共提出了5种方法,一种基于Nose ′-Hoover [Phys.Rev.A31,1695(1985)]运动方程,四种基于Nose ′-Poincare [J.Comp.Phys.,151 114(1999)] Nose动力学的实时公式化。该方法进行了测试,使用一个系统的硬球有吸引力的尾巴,都正确地再现了典型的瞬时温度分布。Nose '-Hoover方法和两种Nose'-Poincare方法在长时间模拟中显示出良好的能量守恒性。

英文摘要:

We present a set of second-order, time-reversible algorithms for the isothermal (NVT) molecular-dynamics (MD) simulation of systems with mixed hard-core/continuous potentials. The methods are generated by combining real-time Nose' thermostats with our previously developed Collision Verlet algorithm [Mol. Phys. 98, 309 (1999)] for constant energy MD simulation of such systems. In all we present 5 methods, one based on the Nose'-Hoover [Phys. Rev. A 31, 1695 (1985)] equations of motion and four based on the Nose'-Poincare' [J.Comp.Phys., 151 114 (1999)] real-time formulation of Nose' dynamics. The methods are tested using a system of hard spheres with attractive tails and all correctly reproduce a canonical distribution of instantaneous temperature. The Nose'-Hoover based method and two of the Nose'-Poincare' methods are shown to have good energy conservation in long simulations.

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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