
337CFD Modeling of Oxygen-Enhanced Combustion
∂
∂
+
∂
∂
=
∂
∂
+
∂
∂
++
t
k
x
ku
x
k
x
G
i
i
j
t
kj
() ()ρρ µ
µ
σ
ρε
(14.28)
∂
∂
+
∂
∂
=
∂
∂
+
∂
∂
+−
tx
u
CS C
i
i
j
t
j
() ()ρε ρε µ
µ
σ
ε
ρρ
ε
ε
ε12
2
+νε
Here,
S
ij ij1
043
2=
+
max.,; ;
η
η
η
ε
The turbulent viscosity is computed as per Equation
14.24, and C
μ
is computed based on the following
equation:
C
AA
os
µ
=
+
*
(14.29)
where U* is a function of velocity gradients and A
o
, A
s
are constants. The model constants are
µ
ε
14.3.3.2.4 k-ω Model
The k-ω model was proposed by Wilcox.
21,22
In this
model the standard k-ε equation is solved, but as a length
determining variable, ω is used. Thi ...