Table 1. Declaration of the variables used in the equations.

Symbol	Description
E	Transition sources
g	Earth gravity (9.81 m/s2)
P	Transition sources
p	Pressure
$\overrightarrow{p}$	Position vector
r	Radius
${\widetilde{Re}}_{\theta t}$	Critical Reynolds number
Rx, Ry, Rz	Rotation around the x- y- or z-axis, respectively
SM	Momentum source
t	Time
U	Velocity vector
u	Fluctuating velocity component in turbulent flow
α	Inclination towards the rotational axis
γ	Intermittency
μ	Molecular (dynamic) viscosity
μt	Turbulent viscosity
ρ	Density
σ	Constant
τ	Molecular stress
ω	Angular velocity
δij	Kronecker delta
$\rho \overline{u_i{u}_j}$	Reynolds stresses