21 citations · 67 across the 13 of their papers we have counts for
8 papers · 1 filter
A continuous data assimilation closure for modeling statistically steady turbulence in large-eddy simulation
Sagy Ephrati, Arnout Franken, Erwin Luesink +2
A closure model is presented for large-eddy simulation (LES) based on the three-dimensional variational data assimilation algorithm. The approach aims at reconstructing high-fideli…
Zeitlin truncation of a Shallow Water Quasi-Geostrophic model for planetary flow
Arnout Franken, Martino Caliaro, Paolo Cifani +1
In this work, we consider a Shallow-Water Quasi Geostrophic equation on the sphere, as a model for global large-scale atmospheric dynamics. This equation, previously studied by Ver…
Data-driven spectral turbulence modeling for Rayleigh-Bénard convection
Sagy Ephrati, Paolo Cifani, Bernard Geurts
A data-driven turbulence model for coarse-grained numerical simulations of two-dimensional Rayleigh-Bénard convection is proposed. The model starts from high-fidelity data and is b…
Data-driven stochastic spectral modeling for coarsening of the two-dimensional Euler equations on the sphere
Sagy Ephrati, Paolo Cifani, Milo Viviani +1
A resolution-independent data-driven stochastic parametrization method for subgrid-scale processes in coarsened fluid descriptions is proposed. The method enables the inclusion of…
Casimir preserving spectrum of two-dimensional turbulence
Paolo Cifani, Milo Viviani, Erwin Luesink +2
We present predictions of the energy spectrum of forced two-dimensional turbulence obtained by employing a structure-preserving integrator. In particular, we construct a finite-mod…
Data-driven stochastic Lie transport modelling of the 2D Euler equations
Sagy Ephrati, Paolo Cifani, Erwin Luesink +1
In this paper, we propose and assess several stochastic parametrizations for data-driven modelling of the two-dimensional Euler equations using coarse-grid SPDEs. The framework of…
Computational modeling for high-fidelity coarsening of shallow water equations based on subgrid data
Sagy Ephrati, Erwin Luesink, Golo Wimmer +2
Small-scale features of shallow water flow obtained from direct numerical simulation (DNS) with two different computational codes for the shallow water equations are gathered offli…
Mixed modeling for large-eddy simulation: The single-layer and two-layer minimum-dissipation-Bardina models
L. B. Streher, M. H. Silvis, P. Cifani +1
Predicting the behavior of turbulent flows using large-eddy simulation requires modeling of the subgrid-scale stress tensor. This tensor can be approximated using mixed models, whi…