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physics.flu-dyn2022
Scaling of secondary flows with surface parameters: a linear approach
Gerardo Zampino, Davide Lasagna, Bharathram Ganapathisubramani
Secondary flows are generated when a lateral variation of the topography, such as streamwise aligned ridges, is imposed to a turbulent wall-bounded flow. In this case, the flow fie…
physics.flu-dyn2021
A-priori sparsification of Galerkin-based reduced order models
Riccardo Rubini, Davide Lasagna, Andrea Da Ronch
A methodology to generate sparse Galerkin models of chaotic/unsteady fluid flows containing a minimal number of active triadic interactions is proposed. The key idea is to find an…
physics.flu-dyn2020
-based sparsification of energy interactions in two-dimensional turbulent flows
Riccardo Rubini, Davide Lasagna, Andrea Da Ronch
In this paper, sparsity-promoting regression techniques are employed to automatically identify from data relevant triadic interactions between modal structures in large Galerkin-ba…