Study of a system of turbulent shear layers and vortices. Part II: Reynolds-averaged turbulence modelling

Direct Numerical Simulation of High-Speed Turbulent Boundary Layers: Current State and Future Challenges

High-speed turbulent boundary layers govern the transport of momentum, mass, and energy in compressible flows and play a central role in determining aerodynamic performance, skin-friction drag, aerodynamic heating, flow stability, and thermal protection requirements of advanced aerospace vehicles. Over the past three d...

Turbulence amplification mechanisms in oblique shock wave/turbulent boundary layer interactions

Nonhydrostatic mixing and three-dimensionality of gravity currents under turbulent pulsating flow

Direct numerical simulations (DNS) are used to investigate the impact of flow instabilities, nonhydrostatic mixing, and phase-dependent flow behavior on gravity currents propagating against a pulsating flow in a lock-exchange configuration. Two regimes are considered: (i) laminar pulsating flow, with two-dimensional (2...

Mean flow scaling in stably stratified temporally developing turbulent boundary layers

Stably stratified wall-bounded turbulence governs the dynamics of many environmental and engineering flows. A key challenge is characterizing how stratification modifies mean and turbulent profiles. Monin--Obukhov similarity theory (MOST) is the dominant modelling framework, although it has rarely been rigorously valid...

The dynamical role of vortices in the two-dimensional inverse cascade of turbulence

We study the inverse energy cascade of two-dimensional turbulence by means of high-resolution numerical simulations forced at intermediate wavenumbers. To clarify the role of vortices generated near the forcing scale, we decompose the vorticity and velocity fields into vortex and background components. Although the vor...

Turbulent flow in a square duct at extreme Reynolds number

Abstract Content of image described in text. We investigate pressure-driven turbulent flow in a square duct using wall-modelled large-eddy simulations (WMLES) of the Navier–Stokes equations. An equilibrium wall model based on the logarithmic law is employed, yielding results in close agreement with direct numerical sim...