Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 3D DLM/FD method for simulating the motion of spheres in a bounded
  shear flow of Oldroyd-B fluids   We present a novel distributed Lagrange multiplier/fictitious domain (DLM/FD)
method for simulating fluid-particle interaction in Oldroyd-B fluids under
creeping conditions. The results concerning two ball interaction in a three
dimensional (3D) bounded shear flow are obtained for Weissenberg numbers up to
1 . The pass and return trajectories of the two ball mass centers are similar
to those in a Newtonian fluid; but they lose the symmetry due to the effect of
elastic force arising from viscoelastic fluids. A tumbling chain of two balls
(a dipole) may occur, depending on the value of the Weissenberg number and the
initial vertical displacement of the ball mass center to the middle plane
between two walls.

11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an