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Granular material in a silo with two openings can display a `flow rate dip',where a non-monotonic relationship between flow rate and orifice separationoccurs. In this paper we study continuum modelling of the silo with twoopenings. We find that the $\mu(I)$ rheology can capture the flow rate dip ifphysically relevant friction parameters are used. We also extend the model byaccounting for wall friction, dilatancy, and non-local effects. We find thataccounting for the wall friction using a Hele-Shaw model better replicates thequalitative characteristics of the flow rate dip seen in experimental data,while dilatancy and non-local effects have very little effect on thequalitative characteristics of the mass flow rate dip. However, we find thatall three of these factors have a significant impact on the mass flow rate,indicating that a continuum model which accurately predicts flow rate will needto account for these effects.

Capturing the dynamics of a two orifice silo with the {\mu}(I) model and extensions