1 Foundation of Fluid Mechanics
65
been established. At present, commonly used are K ~ε two-equation models,
SST K~ω two-equation models, SA one-equation model, and so on. (These
models play an important role in the numerical simulation of flow field, as
shown in Fig. 1.80.)
A general relation used in the establishment of turbulent momentum
transport equation is as follows:
The transport rate of any turbulent momentum is equal to the diffusion
term, the production term, the dissipation term, and the additional term.
d()
dt
=
∂
∂x i
+ Production term − Dissipation term + Additional item
Although turbulence models play an important role in engineering turbulence calculation (as shown in Figs. 1.81, 1.82, and 1.83), careful people
Fig. 1.80 Turbulent jet structure
Fig. 1.81 Numerical simulation of flow around a square cylinder
65
been established. At present, commonly used are K ~ε two-equation models,
SST K~ω two-equation models, SA one-equation model, and so on. (These
models play an important role in the numerical simulation of flow field, as
shown in Fig. 1.80.)
A general relation used in the establishment of turbulent momentum
transport equation is as follows:
The transport rate of any turbulent momentum is equal to the diffusion
term, the production term, the dissipation term, and the additional term.
d()
dt
=
∂
∂x i
+ Production term − Dissipation term + Additional item
Although turbulence models play an important role in engineering turbulence calculation (as shown in Figs. 1.81, 1.82, and 1.83), careful people
Fig. 1.80 Turbulent jet structure
Fig. 1.81 Numerical simulation of flow around a square cylinder