Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Contact angle measurement on curved wetting surface in multiphase
  lattice Boltzmann method   Contact angle is an essential physical quantity that characterizes the
wettability of a substrate. Although it is widely used in the studies of
surface wetting, capillary phenomena and moving contact lines, measuring
contact angles in experiments and simulations is still complicated and
time-consuming. In this paper, we present an efficient scheme for the real-time
and on-the-spot measurement of contact angles on curved wetting surfaces in
lattice Boltzmann simulations. The measuring results are in excellent agreement
with the theoretical predictions by the spherical cap method without
considering the gravity effect. A series of the simulations with various drop
sizes and surface curvatures confirm that the present scheme is
grid-independent. Then, it is verified in gravitational environments by
simulating the deformations of sessile and pendent droplets on the curved
wetting surface. The numerical results are highly consistent with experimental
observations and support the theoretical analysis that the microscopic contact
angle is independent of gravity. Furthermore, the scheme is applied to capture
the dynamic contact angle hysteresis on homogeneous or chemically heterogeneous
curved surfaces. Importantly, the accurate contact angle measurement enables
the mechanical analysis at moving contact lines. The present measurement is
simple and efficient, and can be extended to implement in various multiphase
lattice Boltzmann models.

15
The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys