arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0912.4393physics.comp-ph
收藏

非平衡分子动力学模拟中基于动能的温度计算

Kinetic Energy-Based Temperature Computation in Non-Equilibrium Molecular Dynamics Simulation

Bin Liu, Ran Xu, Xiaoqiao He

摘要:

在分子动力学(MD)模拟中,平均动能被广泛用于表征温度。在这封信中,研究了三种类型的平均动能作为温度度量的适用性,即,总动能、不包括质心平移部分的动能和热扰动动能。我们的MD模拟表明,基于包括刚性平移或旋转运动的动能的温度定义可能会产生不切实际的结果。相比之下,热扰动动能对非平衡分子动力学模拟中的温度计算具有更广泛的适用性。如果小样本需要用于局部温度,那么提出了一种校准方法,以消除平均扰动动能的样本大小依赖性。

英文摘要:

The average kinetic energy is widely used to characterize temperature in molecular dynamics (MD) simulation. In this letter, the applicability of three types of average kinetic energy as measures of temperature is investigated, i.e., the total kinetic energy, kinetic energy without the centroid translation part, and thermal disturbance kinetic energy. Our MD simulations indicate that definitions of temperature based on the kinetic energy including rigid translational or rotational motion may yield unrealistic results. In contrast, the thermal disturbance kinetic energy has wider applicability to temperature computation in non-equilibrium molecular dynamics simulation. If small samples need to be used for local temperature, then a calibration approach is proposed to eliminate the sample-size dependence of the average disturbance kinetic energy.

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。

↑