Impact of Contact Scaling and Drag Calculation on the Accuracy of Coarse‐Grained Discrete Element Method,Chemical Engineering & Technology

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Impact of Contact Scaling and Drag Calculation on the Accuracy of Coarse‐Grained Discrete Element Method
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2020-07-08 , DOI: 10.1002/ceat.202000055
Nico Jurtz ₁ , Harald Kruggel-Emden ₂ , Oleh Baran ₃ , Ravindra Aglave ₄ , Ray Cocco ₅ , Matthias Kraume ₁

Affiliation

The accuracy of coarse‐grained discrete element method (CGDEM) relies on appropriate scaling rules for contact and fluid‐particle interaction forces. For fluidized bed applications, different scaling rules are used and compared with DEM results. The results indicated that in terms of averaged values as mean particle position and voidage profile, the coupling of computational fluid dynamics and CGDEM leads to accurate results for low scaling factors. Regarding the particle dynamics, the approach leads to an underestimation of RMS values of particle position indicating a loss of particle dynamics in the system due to coarse graining. The impact of cell cluster size on drag force calculation is studied. The use of energy minimization multiscale drag correction is investigated, and a reduced mesh dependency and good accuracy are observed.

中文翻译：

接触缩放和阻力计算对粗粒离散元方法精度的影响

粗粒离散元方法（CGDEM）的准确性取决于接触力和流体-颗粒相互作用力的适当缩放规则。对于流化床应用，将使用不同的缩放规则，并将其与DEM结果进行比较。结果表明，就平均颗粒位置和空隙度分布的平均值而言，计算流体动力学和CGDEM的耦合可得出低比例因子的准确结果。关于粒子动力学，该方法导致对RMS的低估颗粒位置的值表示由于粗粒化导致系统中颗粒动力学的损失。研究了单元簇大小对阻力计算的影响。研究了能量最小化多尺度阻力校正的使用，并观察到减小的网格依赖性和良好的精度。

更新日期：2020-07-08

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