Lagrangian coherent structures and entrainment near the turbulent/non-turbulent interface of a gravity current

Lagrangian properties of the entrainment across turbulent/non-turbulent interface layers

The role of coherent vortices near the turbulent/non-turbulent interface in a planar jet.

The role of coherent vortices near the turbulent/non-turbulent (T/NT) interface in a turbulent plane jet is analysed by a direct numerical simulation (DNS). The coherent vortices near the jet edge consist of large-scale vortical structures (LSVSs) maintained by the mean shear and intense vorticity structures (IVSs) created by the background fluctuating turbulence field. The radius of the LSVS i...

Lagrangian Coherent Structures near a Subtropical Jet Stream

Direct Lyapunov exponents and stability results are used to extract and distinguish Lagrangian coherent structures (LCS) from a three-dimensional atmospheric dataset generated from the Weather Research and Forecasting (WRF) model. The numerical model is centered at 19.788N, 155.558W, initialized from the Global Forecast System for the case of a subtropical jet stream near Hawaii on 12 December ...

an experimental study of turbulent mixing near a density interface

the entrainment of a stably stratified layer into a turbulent mixed layer in a confined region has been studied in the laboratory for different richardson numbers, ri. the results include direct observation of turbulent characteristics and density measurements using two high precision salinity meters. the measurements include turbulence intensity, scale of eddies near the interface and energy s...

Lagrangian Coherent Structures

Mounting evidence suggests that fluid advection can effectively be studied by considering special material surfaces, which are referred to here as Lagrangian coherent structures (LCSs). What makes these material surfaces special is their distinguished attracting or repelling nature. Notably, LCS are often locally the most strongly attracting or repellingmaterial surfaces in theflow, and as such...