194 citations · 1.6k across the 31 of their papers we have counts for
32 papers
Commutative Coarse-graining on the Sphere
Chayut Teeraratkul, Hussein Aluie
Filtering by spatial convolution underlies coarse-graining and Large Eddy Simulation, the analysis of multiscale dynamics, and data processing across the sciences. Yet, as commonly…
Harmonic Extension for Multiscale Analysis and Modeling Near Boundaries, with an Ocean Application
Benjamin A. Storer, Mehrnoush Kharghani, Alistair Adcroft +1
Treatment of fields near domain boundaries is a long-standing problem in signal processing that has come into renewed focus following recent efforts in convolution-based multiscale…
A Theory for Wind Work on Oceanic Mesoscales and Submesoscales
Shikhar Rai, J. Thomas Farrar, Hussein Aluie
Previous studies focused primarily on wind stress being proportional to wind velocity relative to the ocean velocity, which induces a curl in wind stress with polarity opposite to…
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…
Radiation and Heat Transport in Divergent Shock-Bubble Interactions
Kelin Kurzer-Ogul, Brian M. Haines, David S. Montgomery +15
Shock-bubble interactions (SBI) are important across a wide range of physical systems. In inertial confinement fusion, interactions between laser-driven shocks and micro-voids in b…
Global Cascade of Kinetic Energy in the Ocean and the Atmospheric Imprint
Benjamin A. Storer, Michele Buzzicotti, Hemant Khatri +2
We present the first estimate for the ocean's global scale-transfer of kinetic energy (KE), across scales from 10~km to 40000~km. We show the existence of oceanic KE transfer betwe…
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…
Global Energy Spectrum of the General Oceanic Circulation
Benjamin A. Storer, Michele Buzzicotti, Hemant Khatri +2
Since the advent of satellite altimetry, our perception of the oceanic circulation has brought into focus the pervasiveness of mesoscale eddies that have typical scales of tens to…
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…
Spatio-temporal coarse-graining decomposition of the global ocean geostrophic kinetic energy
Michele Buzzicotti, Benjamin A. Storer, Hemant Khatri +2
We expand on a recent determination of the first global energy spectrum of the ocean's surface geostrophic circulation (Storer et al., 2022) using a coarse-graining (CG) method. We…
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…
Decoupling of the Kinetic and Magnetic Energy Cascades in MHD Turbulence
Xin Bian, Hussein Aluie
Magnetic and kinetic energy in ideal incompressible MHD are not global invariants and, therefore, it had been justified to discuss only the cascade of their sum, total energy. We p…
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…
Convolutions on the Sphere: Commutation with Differential Operators
Hussein Aluie
We generalize the definition of convolution of vectors and tensors on the 2-sphere, and prove that it commutes with differential operators. Moreover, vectors and tensors that are n…
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…
Coarse-Grained Incompressible Magnetohydrodynamics: analyzing the turbulent cascades
Hussein Aluie
We formulate a coarse-graining approach to the dynamics of magnetohydrodynamic (MHD) fluids at a continuum of length-scales. In this methodology, effective equations are derived fo…
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…
The conservative cascade of kinetic energy in compressible turbulence
Hussein Aluie, Shengtai Li, Hui Li
The physical nature of compressible turbulence is of fundamental importance in a variety of astrophysical settings. We present the first direct evidence that mean kinetic energy ca…