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Impact of Contact Scaling and Drag Calculation on the Accuracy of Coarse‐Grained Discrete Element Method
Author(s) -
Jurtz Nico,
Kruggel-Emden Harald,
Baran Oleh,
Aglave Ravindra,
Cocco Ray,
Kraume Matthias
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202000055
Subject(s) - drag , discrete element method , scaling , mechanics , position (finance) , granularity , particle (ecology) , contact force , statistical physics , cluster (spacecraft) , fluidization , classical mechanics , physics , mathematics , fluidized bed , computer science , geometry , thermodynamics , geology , oceanography , finance , economics , operating system , programming language
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.