In the present paper, we use a coarse-graining approach to investigate nonlinear redistribution of free energy in both position and scale space for weakly collisional magnetised plasma turbulence. For this purpose, high-resolution numerical simulations gyrokinetic (GK) turbulence that span proton-electron range scales, straight magnetic guide field geometry. Accounting averaged effect particles...

The lattice Boltzmann method (LBM) is employed to simulate stratified plane Couette (SPC) flows in their statistically stationary turbulent state. aim assess the suitability of LBM for direct simulation wall-bounded, sheared turbulence under influence stable stratification. SPC flow generated by two parallel plates moving opposite directions with velocities ± U w, and buoyancy fixed at b w uppe...

Using liquid helium, liquid nitrogen, and water as test fluids, we attempt to generate homogeneous turbulence in a steadily rotating system. We create turbulence by pulling a grid in rotating channels with both square and round cross sections, and observe large-scale inertial waves in the flow. These inertial waves quickly sense the boundaries, and resonate at frequencies characteristic of the ...

This paper investigates the dynamics of velocity gradients for a spatially developing flow generated by a single square element of a fractal square grid at low inlet Reynolds number through direct numerical simulation. This square grid-element is also the fundamental block of a classical grid. The flow along the grid-element centreline is initially irrotational and becomes turbulent further dow...

This study assesses the sensitivity of numerical results of air flow modelling within an urban environment to the six different turbulence models applied in a specific case of a studied staggered cross-road. The principal parameters investigated in this comparison are position of centres of vortices within a street canyon, two components of the spatial velocity vector, turbulent kinetic energy,...

A Cartesian grid solver is coupled with an orthogonal curvilinear grid solver using overset grid interpolation and a coupled pressure Poisson solver. It aims at resolving the boundary layer on the body surface effectively. SUGGAR code, an overset grid assembly program, provides overset grid information of a Cartesian background grid and a thin orthogonal body-fitted grid to resolve the boundary...

This work investigates the response of two-dimensional, turbulent boundary layer characteristics over a flat plate to the presence of suspended particulate matter. Both phases are assumed to be interacting continua. That is, the carrier fluid equations are considered to be coupled with the particle-phase equations. A finite-difference technique with non-uniform grid has been employed for the so...

Funding information European Commission Horizon 2020, Grant/Award Number: 671571; Engineering and Physical Sciences Research Council (EPSRC), Grant/Award Number: EP/L000261/1 Summary A new approach to turbulence simulation, based on a combination of large eddy simulation (LES) for the whole flow and an array of non–space-filling quasi-direct numerical simulations (QDNS), which sample the respon...