Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A two-phase flow model of sediment transport: transition from bedload to
  suspended load   The transport of dense particles by a turbulent flow depends on two
dimensionless numbers. Depending on the ratio of the shear velocity of the flow
to the settling velocity of the particles (or the Rouse number), sediment
transport takes place in a thin layer localized at the surface of the sediment
bed (bedload) or over the whole water depth (suspended load). Moreover,
depending on the sedimentation Reynolds number, the bedload layer is embedded
in the viscous sublayer or is larger. We propose here a two-phase flow model
able to describe both viscous and turbulent shear flows. Particle migration is
described as resulting from normal stresses, but is limited by turbulent mixing
and shear-induced diffusion of particles. Using this framework, we
theoretically investigate the transition between bedload and suspended load.

34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph