Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Synchronization of rotating helices by hydrodynamic interactions   Some types of bacteria use rotating helical flagella to swim. The motion of
such organisms takes place in the regime of low Reynolds numbers where viscous
effects dominate and where the dynamics is governed by hydrodynamic
interactions. Typically, rotating flagella form bundles, which means that their
rotation is synchronized. The aim of this study is to investigate whether
hydrodynamic interactions can be at the origin of such a bundling and
synchronization. We consider two stiff helices that are modelled by rigidly
connected beads, neglecting any elastic deformations. They are driven by
constant and equal torques, and they are fixed in space by anchoring their
terminal beads in harmonic traps. We observe that, for finite trap strength,
hydrodynamic interactions do indeed synchronize the helix rotations. The speed
of phase synchronization decreases with increasing trap stiffness. In the limit
of infinite trap stiffness, the speed is zero and the helices do not
synchronize.

33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con