  When objects are forced to flow through constrictions their transport can be
frustrated temporarily or permanently due to the formation of arches in the
region of the bottleneck. While such systems have been intensively studied in
the case of solid particles in a gas phase being forced by gravitational
forces, the case of solid particles suspended in a liquid phase, forced by the
liquid itself, has received much less attention. In this case, the influence of
the liquid flow on the transport efficiency is not well understood yet, leading
to several apparently trivial, but yet unanswered questions, e.g., would an
increase of the liquid flow improve the transport of particles or worsen it?
Although some experimental data is already available, it lacks enough detail to
give a complete answer to such a question. Numerical models would be needed to
scrutinize the system deeper. In this paper, we study this system making use of
an advanced discrete particle solver (MercuryDPM) and an approximated numerical
model for the liquid drag and compare the results with experimental data.
