Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimisation of a Hydrodynamic SPH-FEM Model for a Bioinspired
  Aerial-aquatic Spacecraft on Titan   Titan, Saturn's largest moon, supports a dense atmosphere, numerous bodies of
liquid on its surface, and as a richly organic world is a primary focus for
understanding the processes that support the development of life. In-situ
exploration to follow that of the Huygens probe is intended in the form of the
coming NASA Dragonfly mission, acting as a demonstrator for powered flight on
the moon and aiming to answer some key questions about the atmosphere, surface,
and potential for habitability. While a quadcopter presents one of the most
ambitious outer Solar System mission profiles to date, this paper aims to
present the case for an aerial vehicle also capable of in-situ liquid sampling
and show some of the attempts currently being made to model the behaviour of
this spacecraft.

34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph