Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Directional Clogging and Phase Separation for Disk Flow Through Periodic
  and Diluted Obstacle Arrays   We model collective disk flow though a square array of obstacles as the flow
direction is changed relative to the symmetry directions of the array. At lower
disk densities there is no clogging for any driving direction, but as the disk
density increases, the average disk velocity decreases and develops a drive
angle dependence. For certain driving angles, the flow is reduced or drops to
zero when the system forms a heterogeneous clogged state consisting of high
density clogged regions coexisting with empty regions. The clogged states are
fragile and can be unclogged by changing the driving angle. For large obstacle
sizes, we find a uniform clogged state that is distinct from the collective
clogging regime. Within the clogged phases, depinning transitions can occur as
a function of increasing driving force, with strongly intermittent motion
appearing just above the depinning threshold. The clogging is robust against
the random removal or dilution of the obstacle sites, and the disks are able to
form system-spanning clogged clusters even under increasing dilution. If the
dilution becomes too large, however, the clogging behavior is lost.

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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org