58
P. Liu
Fig. 1.72 Near-wall shear turbulence
Fig. 1.73 Pipeline velocity and stress distribution
In the formula, ν t is the Turbulent or Eddy Viscosity. In contrast, the
viscous shear stress produced by time-averaged flow is
τ l = ρν
∂u
∂ y
The total shear stress acting on the stratosphere is
τ 0 = τ t + τ l = ρ(ν + ν t )
∂u
∂ y
Compared with the molecular viscous coefficient v, the eddy viscous coefficient v t is not a physical property of the fluid, but a function of the turbulent
motion state. In this way, the closure of the turbulence problem can be
attributed to how to determine the size and distribution of v t . At first, Boussinesq thought that v t was a constant. Later, it was found that v t not only had
P. Liu
Fig. 1.72 Near-wall shear turbulence
Fig. 1.73 Pipeline velocity and stress distribution
In the formula, ν t is the Turbulent or Eddy Viscosity. In contrast, the
viscous shear stress produced by time-averaged flow is
τ l = ρν
∂u
∂ y
The total shear stress acting on the stratosphere is
τ 0 = τ t + τ l = ρ(ν + ν t )
∂u
∂ y
Compared with the molecular viscous coefficient v, the eddy viscous coefficient v t is not a physical property of the fluid, but a function of the turbulent
motion state. In this way, the closure of the turbulence problem can be
attributed to how to determine the size and distribution of v t . At first, Boussinesq thought that v t was a constant. Later, it was found that v t not only had