buoyant force

Hello,

I've been looking into this for my simulations as well. As far as I know, the appropiate implementation of the buoyancy force in your model depends on the CCDM set of equations that you're using. For sets I and II, it's implicitly added in the form of the grad(p). For set III of equations, there is a term that seem to account explicitly for bouyancy (although I don't think that it's related to that Archimedes model in CFDEM). For more informations regarding sets I, II and III, check: Zhou et al. (2010) "Discrete particle simulation of particle–fluid flow: model formulations and their applicability".

I've seen that sets I, II and III have been implemented in the latest release of CFDEM so you should be able to choose from there. Regarding the Archimedes model, I haven't seen any publications where an explicit force term accounting for an "Archimedes lift" appears.

If I were you, I'd just choose set I (which seems to be the most appropiate for CCDM simulations according to Zhou et al.) ignore that Archimedes term.

Also, if anyone could confirm or dismiss my thoughts on the appropiate implementation of bouyancy force, that'd be amazing. Thanks!

Best regards.

Hi,

if you choose model A, you cannt activate buoyant force because it is included in gradP. There are some publications mentioned buoyant force in their model like Shan T, 2014.

Regards,