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arXiv 1901.02451cond-mat.stat-mechphysics.flu-dyn
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有色噪声下耗散粒子动力学的研究

Investigation of dissipative particle dynamics with colored noise

Morgane Borreguero, Marco Ellero, Nikolaus A. Adams

摘要:

研究了具有时间相关随机噪声的耗散粒子动力学(DPD)的行为。提出了一种新的DPD随机力,它由噪声与1/t成正比的随机力组成,并由所谓的袋鼠过程产生。我们强调随机系统中的时间相关噪声的好处。我们表明,该系统具有显着不同的性质,从经典的DPD,驱动的维纳噪声。当速度的概率分布函数为高斯分布时,加速度呈现双峰特征。虽然涨落耗散定理可能不严格成立,但我们证明了系统达到涨落耗散平衡的平衡态。我们相信,我们对DPD模型的探索性研究可能会刺激修改后的DPD应用到非常规的问题,超越分子建模。

英文摘要:

We investigate the behavior of dissipative particle dynamics (DPD) with time-correlated random noise. A new stochastic force for DPD is proposed which consists of a random force whose noise has an algebraic correlation proportional to 1/t and is generated by the so called Kangaroo process. We stress the benefits of a time correlated noise in stochastic systems. We show that the system exhibits significantly different properties from classical DPD, driven by Wiener noise. While the probability distribution function of the velocity is Gaussian, the acceleration develops a bi-modal character. Although the fluctuation dissipation theorem may not strictly hold, we demonstrate that the system reaches equilibrium states with fluctuation-dissipation balance. We believe that our explorative research on the DPD model may stimulate the application of modified DPD to unconventional problems beyond molecular modeling.

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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