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首页> 外文会议>International Astronautical Congress >MICROGRAVITY SCIENCES AND PROCESSES SYMPOSIUM (A2) Poster Session (P):THE DISSIPATIVE PARTICLE DYNAMICS SIMULATION OF THE MOTION OF DROPS UNDER MICROGRAVITY
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MICROGRAVITY SCIENCES AND PROCESSES SYMPOSIUM (A2) Poster Session (P):THE DISSIPATIVE PARTICLE DYNAMICS SIMULATION OF THE MOTION OF DROPS UNDER MICROGRAVITY

机译：微匍匐科学与流程研讨会（A2）海报（P）：微匍匐下液滴运动的耗散粒子动力学模拟

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摘要

The effects of sloshing propellant on the control system and movement stability of a spacecraft are very important and cannot typically be ignored. The nonlinear sloshing during a simulated thrusting burn is difficult to analyze using traditional methods. Thus, it demands appropriate simulation tools to analyze the motion of drops in microgravity environment. Dissipative particle dynamics (DPD) is a mesoscopic simulation method introduced by Hoogerbrugge and Koelman, which allows for larger time steps than molecular dynamics, can be applicable to analyze the motion of drops. In this paper, based on DPD method, revise random forces coefficient by using analytical approach of Bond number. Combined with equation of surface tension, use the DPD method to simulate the motion of drops under microgravity and to evaluate few effective parameters. The results show that the conservative force and the random force haven't nearly effect on the motion of drops under microgravity. However, the motion of drops is governed by Bond number. When Bond number is lower, the nonlinear behavior for the drops is more clearly. Because of random coefficient, the time evolution of instable motion of drops is influenced by the random force. The analysis is verified by comparing with earlier experimental results.
机译：晃动推进剂对航天器的控制系统和运动稳定性的影响非常重要，通常不能被忽略。模拟推力燃烧期间的非线性晃动难以使用传统方法分析。因此，它需要适当的模拟工具来分析微匍匐环境中滴的运动。耗散粒子动态（DPD）是由Hoogerbrugge和Koelman引入的介于介绍模拟方法，其允许比分子动力学的较大时间步长，可以适用于分析液滴的运动。本文基于DPD方法，通过使用键合数的分析方法来修改随机力系数。结合表面张力方程，使用DPD方法模拟微匍匐液滴下降的运动，并评估少数有效参数。结果表明，保守力和随机力几乎没有对微匍匐液滴下降的影响。然而，滴剂的运动由键编号控制。当粘合数较低时，液滴的非线性行为更清楚。由于随机系数，滴落的瞬时运动的时间演变受随机力的影响。通过与早期的实验结果进行比较来验证分析。

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