Hernandez, C Yang, Q Hwang, Y

Continuing from Part 1 (Hernández et al., J. Fluid Mech., vol. 936, A33, 2022), a generalized quasilinear (GQL) approximation is studied in turbulent channel flow using a flow decomposition defined with spanwise Fourier modes: the flow is decomposed into a set of low-wavenumber spanwise Fourier modes and the rest high-wavenumber modes. This decompo...

Modesti, Davide Pirozzoli, Sergio

We carry out direct numerical simulation (DNS) of flow in a turbulent square duct by focusing on heat transfer effects, considering the case of unit Prandtl number. Reynolds numbers up to $Re_\tau \approx 2000$ are considered which are much higher than in previous studies, and which yield clear scale separation between inner- and outer-layer dynami...

Teissier, Jean-Mathieu Müller, Wolf-Christian

The role of the different helical components of the magnetic and velocity fields in the inverse spectral transfer of magnetic helicity is investigated through Fourier shell-to-shell transfer analysis. Magnetic helicity transfer analysis is performed on chosen data from direct numerical simulations of homogeneous isothermal compressible magnetohydro...

Teissier, Jean-Mathieu Müller, Wolf-Christian

The inverse transfer of magnetic helicity is investigated through direct numerical simulations of large-scale mechanically driven turbulent flows in the isothermal ideal magnetohydrodynamics framework. The mechanical forcing is either purely solenoidal or purely compressive and the turbulent statistically stationary states considered exhibit root m...

Matsumoto, Takeshi Otsuki, Michio Ooshida, Takeshi Goto, Susumu

We study the correlation function and mean linear response function of the velocity Fourier mode of statistically steady-state, homogeneous and isotropic turbulence in Eulerian and Lagrangian coordinates through direct numerical simulation (DNS). As the Lagrangian velocity, we here adopt Kraichnan's Lagrangian-history framework where Lagrangian par...

Vadrot, Aurélien Giauque, Alexis Corre, Christophe

The present article investigates the effects of a BZT (Bethe-Zel'dovich-Thompson) dense gas (FC-70) on the development of turbulent compressible mixing layers at three different convective Mach numbers M c = 0.1, 1.1 and 2.2. This study extends a previous analysis conducted at M c

Moser, Robert D. Haering, Sigfried W. Yalla, Gopal R.
Published in
Annual Review of Fluid Mechanics

This review examines large eddy simulation (LES) models from the perspective of their a priori statistical characteristics. The most well-known statistical characteristic of an LES subgrid-scale model is its dissipation (energy transfer to unresolved scales), and many models are directly or indirectly formulated and tuned for consistency of this ch...

Meldi, M. Mariotti, A. Salvetti, M. Sagaut, P.

The sensitivity of turbulent dynamics in spatially evolving mixing layers to small skew angles is investigated via direct numerical simulation. Angle is a measure of the lack of parallelism between the two asymptotic flows, whose interaction creates the turbulent mixing region. The analysis is performed considering a large range of values of the sh...

Valentina, Valori Alessio, Innocenti Bérengère, Dubrulle Sergio, Chibbaro

We apply the weak formalism on the Boussinesq equations, to characterize scaling properties of the mean and the standard deviation of the potential, kinetic and viscous energy flux in very high resolution numerical simulations. The local Bolgiano-Oboukhov length $L_{BO}$ is investigated and it is found that its value may change of an order of magni...

Zhang, Li Hesse, Marc Wang, Moran

Previous work on solute transport with sorption in Poiseuille flow has reached contradictory conclusions. Some have concluded that sorption increases mean solute transport velocity and decreases dispersion relative to a tracer, while others have concluded the opposite. Here we resolve this contradiction by deriving a series solution for the transie...