Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particle dynamics in self-generated dunes over a range of hydraulic and
  sediment transport conditions using LES--DEM   Direct measurement of vertical and longitudinal sediment fluxes on migrating
sandy bedforms are extremely difficult to perform in both the field and
laboratory. In this study we use the LES--DEM (large eddy simulation--discrete
element method) solver SediFoam to examine the individual particle motions and
resulting fluxes in a domain of self-generated dunes. In SediFoam, the motions
of, and collisions among, the sediment grains as well as their interactions
with surrounding turbulent flows are resolved. The numerical simulations are
performed over a range of transport settings, spanning bedform inception
through washout conditions, to examine the individual particle dynamics. The
space-time evolution of dune surfaces is demonstrated. The self-generated dunes
are stable at relatively low Reynolds numbers, but then become increasingly
unstable at higher Reynolds numbers; eventually washing out as the number of
bypass grains and particles in suspension increase. Data from the simulation
are used to examine the vertical entrainment rate of particles and the
fractionation of total sediment load into bed and suspended fractions as a
function of transport conditions. The study also compares the sediment
transport rate obtained using the bedform geometry and celerity to the true
transport rate at different transport stages.

28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn