https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 Inertial range similarity for velocity and scalar spectra in a turbulent channel flow https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:8815 Sat 24 Mar 2018 08:38:26 AEDT ]]> Transport equation for the mean turbulent energy dissipation rate on the centreline of a fully developed channel flow https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26852 iso/⋶ is sufficiently close to 1 on the centreline, our main focus is on the isotropic form of the transport equation. It is found that the imbalance between the production of ⋶ due to vortex stretching and the destruction of ⋶ caused by the action of viscosity is governed by the diffusion of ⋶ by the wall-normal velocity fluctuation. This imbalance is intrinsically different from the advection-driven imbalance in decaying-type flows, such as grid turbulence, jets and wakes. In effect, the different types of imbalance represent different constraints on the relation between the skewness of the longitudinal velocity derivative S₁,₁ and the destruction coefficient G of enstrophy in different flows, thus resulting in non-universal approaches of S₁,₁ towards a constant value as the Taylor microscale Reynolds number, Rλ, increases. For example, the approach is slower for the measured values of S₁,₁ along either the channel or pipe centreline than along the axis in the self-preserving region of a round jet. The data for S₁,₁ collected in different flows strongly suggest that, in each flow, the magnitude of S₁,₁ is bounded, the value being slightly larger than 0.5.]]> Sat 24 Mar 2018 07:41:48 AEDT ]]>