Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Remote trajectory tracking of rigid bodies immersed in a 2D perfect
  incompressible fluid   We consider the motion of several rigid bodies immersed in a two-dimensional
incompressible perfect fluid. The motion of the rigid bodies is given by the
Newton laws with forces due to the fluid pressure and the fluid motion is
described by the incompressible Euler equations. Our analysis covers the case
where the circulations of the fluid velocity around the bodies are nonzero and
where the fluid vorticity is bounded. The whole system occupies a bounded
simply connected domain with an external fixed boundary which is impermeable
except on an open non-empty part where one allows some fluid to go in and out
the domain by controlling the normal velocity and the entering vorticity. We
prove that it is possible to exactly achieve any non-colliding smooth motion of
the rigid bodies by the remote action of a controlled normal velocity on the
outer boundary which takes the form of state-feedback, with zero entering
vorticity. This extends the result of (Glass, O., Kolumb{\'a}n, J. J., Sueur,
F. (2017). External boundary control of the motion of a rigid body immersed in
a perfect two-dimensional fluid. Analysis \& PDE) where the exact
controllability of a single rigid body immersed in a 2D irrotational perfect
incompressible fluid from an initial position and velocity to a final position
and velocity was investigated. The proof relies on a nonlinear method to solve
linear perturbations of nonlinear equations associated with a quadratic
operator having a regular non-trivial zero. Here this method is applied to a
quadratic equation satisfied by a class of boundary controls, which is obtained
by extending the reformulation of the Newton equations performed in the
uncontrolled case in (Glass, O., Lacave, C., Munnier, A., Sueur, F. (2019).
Dynamics of rigid bodies in a two dimensional incompressible perfect fluid.
Journal of Differential Equations, 267(6), 3561-3577) to the case where a
control acts on the external boundary.

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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: physics