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DEM Outlet Boundary Condition

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Old   February 5, 2019, 07:42
Default DEM Outlet Boundary Condition
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Hi,

I am modeling, or at least trying to model filling a volume (2D) with particles. When I activate DEM collisions, I cannot control particle mass outflow even if i assign reflect or wall jet at the outlet. I tried both outflow and pressure outlet BCs.

But if I turn off DEM and activate volume fraction approaching packing limit (is not allowed to be activated with DEM), outlet BC follows my instruction and does not allow phase-2 mass flow outlet with reflect or wall jet options.


However with DEM turned off and volume fraction option ticked, there is a discrepancy between DPM concentration and volume fraction values. The option supposedly preventing concentration values to become irrealistic, does not do its job and concentration keeps increasing (hundreds of thousands kg/m3) for a material density of 3000kg/m3.

I will be grateful to anyone who can help me.

Best regards
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