Reply To: Coarse graining in Rocky

[Jackson Gomes]

 

Hi Saeed.

Ideally, particles should be smaller than the CFD cell, but if Vp > Vc, the diffusion algorithm redistributes the solid fraction to neighboring cells, ensuring accuracy. You can refer to the on CFD-DEM coupling in the CFD Coupling Technical Manual, Chapter 6, which discuss the relationship between particle size and CFD cell size, as well as the use of diffusion algorithms to redistribute solid fractions.

We need more information about what is meant by “porosity” (solid fraction or geometric arrangement) and “poor results” (convergence, discrepancies, or another criterion) to identify and address the issue effectively.

Best Regards