Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Effect of Pore Structure in Flapping Wings on Flight Performance   This study investigates the effects of porosity on flying creatures such as
dragonflies, moths, hummingbirds, etc. wing and shows that pores can affect
wing performance. These studies were performed by 3D porous flapping wing flow
analyses on Comsol Multiphysics. In this study, we analyzed different numbers
of the porous wing at different angles of inclination in order to see the
effect of pores on lift and drag forces. To compare the results 9 different
analyses were performed. In these analyses, airflow velocity was taken as 5
m/s, angle of attack as 5 degrees, frequency as 25 Hz, and flapping angle as 30
degrees. By keeping these values constant, the number of pores was changed to
36, 48, and 60, and the pore angles of inclination to 60, 70, and 80 degrees.
Analyses were carried out by giving laminar flow to this wing designed in the
Comsol Multiphysics program. The importance of pores was investigated by
comparing the results of these analyses.

31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex