Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective medium model for a suspension of active swimmers   Several active organisms in nature tend to reside as a community in a viscous
fluid medium. We analyze the variation of swimming characteristics of an active
swimmer present in a dilute and disperse suspension, modeled as an effective
Brinkman medium. This idealized representation of a collection of active
swimmers allows one to distinguish the impact of the interior domain available
to an individual swimmer as well as the contribution of its neighbors. Darcy's
law along with the analytical solution enables the effective resistivity to be
predicted as a function of the volume fraction which is in close agreement with
the well-known Carman-Kozeny equation. This facilitates the successive analysis
of the propulsion speed, power dissipation, and swimming efficiency of the
targeted swimmer as a function of the volume fraction which is decisive in
nutrient transport and uptake or reproduction in a collective environment. A
stress-jump condition is also imposed across a cell to indicate a mean
effective force due to the nearby swimmers. At suitable values of this
stress-jump coefficient, the relative increase of the migration velocity and
swimming efficiency is noticeably higher at an optimum occupancy.

27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio