Environmental Engineering Reference
In-Depth Information
Table 1 Simulation condition and setting
List of condition
Applied model
Value
Unit
CFD dimension
2
Time derivative
Implicit unsteady
Temporal discretization
1st-order
Time step
5.0E 06
s
Inner iteration
2
Iteration
Multiphase model
Volume of
fl
fluid (VOF)
k- ε
SST k-
Turbulent model
ˉ
RSM
kg/m 3
Multiphase material
Air
Density
1.18
Dynamic viscosity
1.9E 05
Pa-s
kg/m 3
Water
Density
997.56
Dynamic viscosity
8.9E
04
Pa-s
Multiphase interaction
Water - air
Surface tension
7.4E 02
N/m
Table 2 Boundary and Initial condition
Boundary
Quantity
Value
Unit
Air inlet
Velocity
40
m/s
Water inlet
Velocity
0.67
m/s
Pressure outlet
Gauge pressure
0
Pa
Wall
Nonslip condition
Initial condition
Velocity
0
m/s
Gauge pressure
0
Pa
Material in computational domain
Air: 1
Water: 0
6 Quanti
cation
6.1 Boundary Length De
nition
The boundary length is an important indicator in water breakup studies; thus, the
boundary length illustration is shown in Fig. 4 . When there is no breakup, as shown
in Fig. 4 a, the two-phase boundary is controlled by the gravity and the boundary is
a straight simple line. When breakup phenomenon occurs, as shown in Fig. 4 b, both
the wave boundary surface and droplets contribute to increase the length of the
boundary resulting in longer boundary length. In this study, boundary length is used
as quanti
cation means of grid-independent study and simulation result.
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