Implementation of Charged Particle Behavior in Discrete Element Method (DEM) Simulations

机译：离散元法（DEM）模拟中带电粒子行为的实现

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To understand the behavior of charged lunar regolith when perturbed by lunar landers, it is important to couple the grain dynamics with mechanical and electrical particle interactions. To accomplish this, improvements have been made to a discrete element method (DEM) software package to include both short- and long-range interactions between spherical particles. Short-range interactions rely on contact between the particles, such as electrical conduction and triboelectric charge transfer driven by work functions. Long-range interactions act at a distance between every pairing of particles, such as electrostatic forces and gravitational forces. Results from simulations between a few particles are compared with theory to verify these added behaviors prior to scaling up to more complex scenarios. The radii, initial charges, electrical conductivities, work functions, and separation of the particles are varied and the resultant charges as well as the time required to reach the final state are determined.

机译：为了了解月球着陆器扰动时带电月球表土的行为，将颗粒动力学与机械和电粒子相互作用耦合起来是很重要的。为了实现这一点，对离散元法（DEM）软件包进行了改进，以包括球形粒子之间的短程和长程相互作用。短程相互作用依赖于粒子之间的接触，例如由功函数驱动的导电和摩擦电荷转移。长程相互作用作用作用于每对粒子之间的距离，例如静电力和引力。在放大到更复杂的场景之前，将几个粒子之间的模拟结果与理论进行比较，以验证这些附加行为。粒子的半径、初始电荷、导电率、功函数和分离是不同的，由此产生的电荷以及达到最终状态所需的时间是确定的。

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《Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments》|2021年|188-199|共12页
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James R. Phillips III; Hao Wang; Alexander Hillegass; Annelisa Esparza; Adrienne R. Dove; Tarek A. Elgohary;
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Implementation of Charged Particle Behavior in Discrete Element Method (DEM) Simulations

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