Investigation into calibration of discrete element model parameters for scale-up and validation of particle–structure interactions under impact conditions
Investigation into calibration of discrete element model parameters for scale-up and validation of particle–structure interactions under impact conditions
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DOI：
10.1016/j.powtec.2011.05.017
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发表时间：
2011-09
影响因子：
5.2
通讯作者：
Andrew P Grima;P. Wypych
中科院分区：
文献类型：
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作者：
Andrew P Grima;P. Wypych
离散元法（DEM）是一种流行的数值方法，用于理解颗粒物料的不连续流动，优化设备的设计和操作。颗粒材料在平坦表面上的冲击可能涉及复杂的流动动力学，并且可能难以使用分析技术进行建模。存在大量的工业应用，其中发生颗粒与结构的相互作用，例如由大量颗粒和复杂颗粒行为组成的带式输送机冲击板转移站。经典的分析方法可以用来提供一个定量的描述颗粒材料的流动通过一个转移点的轨迹和速度分布方面，但一般限于2-D分析。DEM方法已经建立，但有缺乏详细的验证DEM模型的实验数据和方法来校准和放大DEM模型，以达到准确的预测和result.This本文提出了一个详细的比较分析之间的经典分析方法和DEM预测流动机制与颗粒材料冲击平板的变形。从DEM模拟和分析模型的结果与实验结果进行了比较，从一个可变几何输送机传输设施，以验证和评估的数值方法来解决颗粒流问题。该研究的重点是评估准确模拟材料排放轨迹、流入流的冲击速度、冲击后材料流的速度以及冲击板上的合力的能力。有效地校准DEM材料相互作用参数的方法也被提出和评估，以量化校准方法。一个敏感性分析已进行调查的DEM参数和接触模型的影响反作用力的变化，并检查有效的技术来缩放参数，以减少计算时间和资源。
Discrete element method (DEM) is a popular numerical method used to understand the discontinuous flow of granular materials and optimise the design and operation of equipment. The impingement of granular material on to flat surfaces can involve complex flow dynamics and can be difficult to model using analytical techniques. There are a vast number of industrial applications where particle-to-structure interactions occur such as belt conveyor impact plate transfer stations consisting of a large number of particles and complex particulate behaviour. Classical analytical methods can be used to provide a quantitative description of the flow of granular material through a transfer point in regards to trajectory and velocity distribution but are generally limited to 2-D analysis. DEM methodology has been well established but there is a lack of detailed validation of DEM models to experimental data and methods to calibrate and scale-up DEM models to attain accurate predictions and results.This paper presents a detailed comparative analysis between classical analytical methods and DEM to predict the flow mechanisms associated with the deformation of granular material impacting a flat plate. Results from DEM simulations and analytical models are compared with experimental results from a variable-geometry conveyor transfer facility to validate and evaluate the numerical methods to solve granular flow problems. The study has focused on evaluating the ability to accurately model material discharge trajectories, the velocity of impact from the inflowing stream, the velocity of the material stream after impingement and the resultant forces on the impact plate. Methods to effectively calibrate the DEM material interaction parameters are also presented and evaluated to quantify the calibration methodology. A sensitivity analysis has been conducted to investigate the variation of DEM parameters and contact models on the impact reaction forces and examine effective techniques to scale parameters to reduce computational time and resources.