Evolution of conditionally averaged second-order structure functions in a transitional boundary layer

Electromagnetic Control of a Transitional Boundary Layer

We investigate numerically the transition to turbulence in a flat-plate boundary layer controlled by electromagnetic forces. The fluid considered is incompressible, Newtonian and low electrically conductive. Similar to boundary layer suction, when applying a steady, wall-parallel, and streamwise oriented Lorentz force, the Blasius velocity profile is transformed to an exponential one. Since the...

a second order closure model for calculating the turbulence fluxes in atmospheric boundary layer

turbulent fluxes in the atmospheric boundary layer are calculated using different models. one of the most popular and operational models in this groundwork is the second order turbulent model of mellor and yamada that has been widely used to simulate the planetary boundary layer (pbl). despite its popularity, it has been shown that this model has several weeknesses that affect its accuracy. the...

introducing and examining of a second order closure boundary layer model

one of the popular and well known models in boundary layer that is implemented in most of the operational and familiar models is the mellor-yamada model of atmospheric boundary layer. one reason that this model is so popular is its ability in simulations and exposing of different phenomena in the boundary layer. this model has been constructed based on second order closure hypothesis. beside al...

Asymptotic analysis of second-order boundary layer correctors

Scaling of second- and higher-order structure functions in turbulent boundary layers

The statistical properties of wall turbulence in the logarithmic region are investigated using structure functions of the streamwise velocity. To this end, datasets that span several orders of magnitude of Reynolds numbers are used, up to Reτ = O(106), providing uniquely large scale separations for scrutinising previously proposed scaling laws. For the second-order structure functions strong su...