Hello!
I am dealing with simulation of small particles (the smallest having a radius of 7.5 microns). I have received an error 'Volume expectancy too small'. I am thinking of two possible solutions: first is to make changes to the source code (which is not the topic there, I have posted another discussion in the developer forum) and the other is to enlarge the scale of the simulation (just to make everything bigger).
I am wondering, if I simply increase all my geometries and particles several times (obeying all the relationships between dimensions, etc.) will I be able to achieve decent results?
Previously, due to some mistake I have done the same simulation but with everything being 50 times larger in SI units. I have noticed that my computer ran that simulation faster and with less errors for same time step size. I have not noticed any differences in the visualization.
Best regards,
Azamat Salamat
richti83 | Wed, 04/08/2020 - 21:20
Hey Azamat,
Hey Azamat,
I would suggest to switch to cgs unit system (centimeter,gramm,second).
For scalebility in DEM I suggest these papers:
Katterfeld, Rößler: "Scalability of angle of repose tests for the calibration of DEM parameters" [1]
and
Lommen, S. ; Schott, D. ; Lodewijks, G.: DEM speedup: Stiffness effects on behavior of bulk material 12 (2014), S. 107–112
and
Gröger, T. ; Katterfeld, A.: On the numerical calibration of discrete element models for the simulation of bulk solids, Bd. 21. In: 16th European Symposium on Computer Aided Process Engineering and 9th International Symposium on Process Systems Engineering : Elsevier, 2006 (Computer Aided Chemical Engineering), S. 533–538
[1] https://www.researchgate.net/publication/309136157_Scalability_of_angle_...