forceSubModel - interpolation

Hi everyone,

I'm doing investigations with the cfdemSolverPiso. Thereby, my CFD cells are three times of the volume of the particles. So I'm using the devided voidfraction model and also applied smoothing. Now I've run into the the "interpolation" switch at the force models. In "forceSubModels" its said, that the Eulerian data is interpolated when its gathered for the Lagrangian calculation. Otherwise the cell-centre value of the CFD cell is applied. I don't fully grasp this explanation. In the case a paticle is positioned in two cells. Is the interpolation done in both cells via the voidfraction distribution in the cell? Or is the the interpolation just applied in the cell, where the cell-centre is positioned and the interpolation done for this cell-centre?

Unfortunatelly, the code didn't really help me to understand in that case.

Could anyone give me a hint?

Kind regards
desi