Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the drag and lift coefficients of ellipsoidal particles under
  rarefied flow conditions   The capability to simulate a two-way coupled interaction between a rarefied
gas and an arbitrary-shaped colloidal particle is important for many practical
applications, such as aerospace engineering, lung drug deliver and
semiconductor manufacturing. By means of numerical simulations based on the
Direct Simulation Monte Carlo (DSMC) method, we investigate the influence of
the orientation of the particle and rarefaction on the drag and lift
coefficients, in the case of prolate and oblate ellipsoidal particles immersed
in a uniform ambient flow. This is done by modelling the solid particles using
a cut-cell algorithm embedded within our DSMC solver. In this approach, the
surface of the particle is described by its analytical expression and the
microscopic gas-solid interactions are computed exactly using a ray-tracing
technique. The measured drag and lift coefficients are used to extend the
correlations available in the continuum regime to the rarefied regime, focusing
on the transitional and free-molecular regimes. The functional forms for the
correlations for the ellipsoidal particles are chosen as a generalisation from
the spherical case. We show that the fits over the data from numerical
simulations can be extended to regimes outside the simulated range of $Kn$ by
testing the obtained predictive model on values of $Kn$ that where not included
in the fitting process, allowing to achieve an higher precision when compared
with existing predictive models from literature. Finally, we underline the
importance of this work in providing new correlations for non-spherical
particles that can be used for point-particle Euler-Lagrangian simulations to
address the problem of contamination from finite-size particles in high-tech
mechanical systems.

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The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph