Grid-independent Eulerian-Lagrangian approaches for simulations of solid fuel particle combustion
Artikel i vetenskaplig tidskrift, 2020

In this study, a computational fluid dynamics (CFD) model with three coarse graining algorithms is developed with the implementation of a layer based thermally thick particle model. Three additional coupling methods, cube averaging method (CAM), two-grid method (TGM) and diffusion-based method (DBM), are implemented. These coupling methods are validated and compared with the widely used particle centroid method (PCM) for combustion of a biomass particle in a single particle combustor. It is shown that the PCM has a strong dependence on the grid size, whereas the CAM and TGM are not only grid independent but also improve the predictability of the simulations. Meanwhile, a new parameter, the coupling length, is introduced. This parameter affects the sampling of the gas phase properties required for the particle model and the distribution of the solid phase properties. A method to estimate the coupling length by using empirical correlations is given. In general, it is found that a too small coupling length underestimates the heating-up rate and devolatilization rate, while a too large coupling length overestimates the O2 concentration at the particle surface. The coupling length also has an influence on the distribution of the gas phase products.

Solid fuel



Eulerian-Lagrangian coupling


Jingyuan Zhang

Norges teknisk-naturvitenskapelige universitet

Tian Li

Norges teknisk-naturvitenskapelige universitet

Henrik Ström

Norges teknisk-naturvitenskapelige universitet

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Terese Lövås

Norges teknisk-naturvitenskapelige universitet

Chemical Engineering Journal

13858947 (ISSN)

Vol. 387 123964


Hållbar utveckling




Strömningsmekanik och akustik




Grundläggande vetenskaper



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