Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A non-reflective boundary condition for LBM based on the assumption of
  non-equilibrium symmetry   In this study a new type of non-reflective boundary condition (NRBC) for the
Lattice Boltzmann Method (LBM) is proposed; the Non-equilibrium Symmetry
Boundary Condition (NSBC). The idea behind this boundary condition is to
utilize the characteristics of the non-equilibrium distribution function to
assign values to the incoming populations. A simple gradient based
extrapolation technique and a far-field criterion are used to predict the
macroscopic fluid variables. To demonstrate the non-reflective behaviour of the
NSBC, two different tests have been carried out, examining the capability of
the boundary to absorb acoustic waves respectively vortices. The results for
both tests show that the amount of reflection generated by the NSBC is nearly
zero.

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The categories of this paper are: hep-ph
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol