194 citations · 1.6k across the 31 of their papers we have counts for
19 papers · 1 filter
Calculating Spectra by Sequential High-Pass Filtering
Dongxiao Zhao, Hussein Aluie
We expand on the method of sequential filtering for calculating spectra of inhomogeneous fields. Sadek & Aluie [Phys. Rev. Fluids, 3, 124610 (2018)] showed that the kernel has to h…
Measuring Scale-dependent Shape Anisotropy by Coarse-Graining: Application to Inhomogeneous Rayleigh-Taylor Turbulence
Dongxiao Zhao, Hussein Aluie
We generalize the `filtering spectrum' [1] to probe scales along different directions by spatial coarse-graining. This multi-dimensional filtering spectrum quantifies the spectral…
Effective Drift Velocity from Turbulent Transport by Vorticity
Hussein Aluie, Shikhar Rai, Hao Yin +5
We highlight the differing roles of vorticity and strain in the transport of coarse-grained scalars at length-scales larger than by smaller scale (subscale) turbulence. %sub…
Scaling of Turbulent Viscosity and Resistivity: Extracting a Scale-dependent Turbulent Magnetic Prandtl Number
Xin Bian, Jessica K. Shang, Eric G. Blackman +2
Turbulent viscosity and resistivity are perhaps the simplest models for turbulent transport of angular momentum and magnetic fields, respectively. The associated turbul…
Scale interactions and anisotropy in Rayleigh-Taylor turbulence
Dongxiao Zhao, Riccardo Betti, Hussein Aluie
We study energy scale-transfer in Rayleigh-Taylor (RT) flows by coarse-graining in physical space without Fourier transforms, allowing scale analysis along vertical direction. Two…
Revisiting the Late-Time Growth of Single-mode Rayleigh-Taylor Instability and the Role of Vorticity
Xin Bian, Hussein Aluie, Dongxiao Zhao +2
Growth of the single-fluid single-mode Rayleigh-Taylor instability (RTI) is revisited in 2D and 3D using fully compressible high-resolution simulations. We conduct a systematic ana…
Baropycnal Work: A Mechanism for Energy Transfer Across Scales
Aarne Lees, Hussein Aluie
The role of baroclinicity, which arises from the misalignment of pressure and density gradients, is well-known in the vorticity equation, yet its role in the kinetic energy budget…
Extracting the Spectrum by Spatial Filtering
Mahmoud Sadek, Hussein Aluie
We show that the spectrum of a flow field can be extracted within a local region by straightforward filtering in physical space. We find that for a flow with a certain level of reg…
Inviscid Criterion for Decomposing Scales
Dongxiao Zhao, Hussein Aluie
The proper scale decomposition in flows with significant density variations is not as straightforward as in incompressible flows, with many possible ways to define a `length-scale.…
Energy transfer in turbulence under rotation
Michele Buzzicotti, Hussein Aluie, Luca Biferale +1
It is known that rapidly rotating turbulent flows are characterized by the emergence of simultaneous upscale and downscale energy transfer. Indeed, both numerics and experiments sh…
Mapping the Energy Cascade in the North Atlantic Ocean: The Coarse-graining Approach
Hussein Aluie, Matthew Hecht, Geoffrey K. Vallis
A coarse-graining framework is implemented to analyze nonlinear processes, measure energy transfer rates and map out the energy pathways from simulated global ocean data. Tradition…
Effect of filter type on the statistics of energy transfer between resolved and subfilter scales from a-priori analysis of direct numerical simulations of isotropic turbulence
M. Buzzicotti, M. Linkmann, H. Aluie +3
The effects of different filtering strategies on the statistical properties of the resolved-to-sub-filter scale (SFS) energy transfer are analyzed in forced homogeneous and isotrop…
The direct enstrophy cascade of two-dimensional soap film flows
Mike Rivera, Hussein Aluie, Robert Ecke
We investigate the direct enstrophy cascade of two-dimensional decaying turbulence in a flowing soap film channel. We use a coarse-graining approach that allows us to resolve the n…
Joint downscale fluxes of energy and potential enstrophy in rotating stratified Boussinesq flows
Hussein Aluie, Susan Kurien
We employ a coarse-graining approach to analyze nonlinear cascades in Boussinesq flows using high-resolution simulation data. We derive budgets which resolve the evolution of energ…
Compressible Turbulence: The Cascade and its Locality
Hussein Aluie
We prove that inter-scale transfer of kinetic energy in compressible turbulence is dominated by local interactions. In particular, our results preclude direct transfer of kinetic e…
Scale locality and the inertial range in compressible turbulence
Hussein Aluie
We use a coarse-graining approach to prove that inter-scale transfer of kinetic energy in compressible turbulence is dominated by local interactions. Locality here means that inter…
Scale decomposition in compressible turbulence
Hussein Aluie
This work presents a rigorous framework based on coarse-graining to analyze highly compressible turbulence. We show how the requirement that viscous effects on the dynamics of larg…
Localness of energy cascade in hydrodynamic turbulence, II. Sharp spectral filter
Hussein Aluie, Gregory L. Eyink
We investigate the scale-locality of subgrid-scale (SGS) energy flux and inter-band energy transfers defined by the sharp spectral filter. We show by rigorous bounds, physical argu…
Localness of energy cascade in hydrodynamic turbulence, I. Smooth coarse-graining
Gregory L. Eyink, Hussein Aluie
We introduce a novel approach to scale-decomposition of the fluid kinetic energy (or other quadratic integrals) into band-pass contributions from a series of length-scales. Our dec…