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[Deepak <question684746@xxxxxxxxxxxxxxxxxxxxx>]

Question #684746 on Yade changed:
https://answers.launchpad.net/yade/+question/684746

    Status: Open => Answered

Deepak proposed the following answer:
Hi,

In the simple point force coupling, the hydrodynamic force formulation
is derived from the Stokes drag equation, this is valid when the
Reynolds number   at the particle scale  and the Stokes number is < 1,
which means the inertial fluid forces are negligible compared to the
viscous drag force (doesn't matter if the flow is turbulent or not).
Moreover, we consider the 'suspension' to be dilute, i.e. the volume
fraction of the particles are  < 1-3%

In the case of Re (at the particle scale) or if the stokes number of the
particle  is  1 or more,  or in case of 'dense suspensions ', where the
volume fraction is higher, the inertial effects have to be considered.
For this case one has to use the vol. averaged approach.

Note : In both the cases, the particle size has to be smaller than the
grid cell size.

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