Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Changing Levels of Description in a Fluid Flow Simulation   We describe here our perception of complex systems, of how we feel the
different layers of description are important part of a correct complex system
simulation. We describe a rough models categorization between rules based and
law based, of how these categories handled the levels of descriptions or
scales. We then describe our fluid flow simulation, which combines different
fineness of grain in a mixed approach of these categories. This simulation is
built keeping in mind an ulterior use inside a more general aquatic ecosystem.

34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys