Articolo in rivista

On the benefits of Laplace samples in solving a rare event problem using cross-entropy method

The convergence quality of the cross-entropy (CE) optimizer relies critically on the mechanism meant for randomly generating data samples, in agreement with the inference drawn in the earlier works--the fast simulated annealing (FSA) and fast evolutionary programming (FEP). Since tracing a near-…

The vortex-driven dynamics of droplets within droplets

Understanding the fluid-structure interaction is crucial for an optimal design and manufacturing of soft mesoscale materials. Multi-core emulsions are a class of soft fluids assembled from cluster configurations of deformable oil-water double droplets (cores), often employed as building-blocks for…

Lattice Boltzmann across scales: from turbulence to DNA translocation

High-order kinetic relaxation schemes as high-accuracy Poisson solvers

We present a new approach to find accurate solutions to the Poisson equation, as obtained from the steady-state limit of a diffusion equation with strong source terms. For this purpose, we start from Boltzmann's kinetic theory and investigate the influence of higher-order terms on the resulting…

A Simplified Method of Calculating the Maximum Efficiency of Devices for Photochemical Transformation of Solar Energy under Conditions of a Real Atmosphere

Shearing effects on the phase coarsening of binary mixtures using the active model B

The phase separation of a two-dimensional active binary mixture is studied under the action of an applied shear through numerical simulations. It is highlighted how the strength of the external flow modifies the initial shape of growing domains. The activity is responsible for the formation of…

Monte Carlo methods for sensitivity analysis of Poisson-driven stochastic systems, and applications

We provide Monte Carlo estimators for the derivatives of functionals of Poisson-driven systems, and apply the theoretical results to models of interest in stochastic geometry and insurance

Entropy-Assisted Computing of Low-Dissipative Systems

Entropy feedback is reviewed and highlighted as the guiding principle to reach extremely low dissipation. This principle is illustrated through turbulent flow simulations using the entropic lattice Boltzmann scheme.

Coincidence of the linear and non-linear stability bounds in a horizontal thermal convection problem

We deal with the emergence of the horizontal three-dimensional convection flow from an asymptotic mechanical equilibrium in a parallelepipedic box with rigid walls and a very small horizontal temperature gradient. The non-linear stability bound is associated with a variational problem. It is proved…

Time-Series Clustering Methodology for Estimating Atmospheric Phase Screen in Ground-Based InSAR Data

In multitemporal interferometric synthetic aperture radar (InSAR) applications, propagation delay in the troposphere introduces a major source of disturbance known as atmospheric phase screen (APS). This study proposes a novel framework to compensate for the APS from multitemporal ground-based…