We deal with **turbulence modeling** and simulation of **turbulent flows. **Recent research activities include:

**Development of anisotropic models for Large Eddy Simulation
**

The subgrid stress tensor is supposed to have a tensorial relation with the strain rate tensor. In the figure the r.m.s. (root mean square) values of longitudinal velocity component for a plane channel flow at Re

_{τ}=180 are plotted and compared to an isotropic model, to Direct Numerical Simulations and to experimental data.

**Turbulent convection between two infinite parallel planes **

We employ a dynamic Large Eddy Simulation model for turbulent convection at Rayleigh number 10^{9}. In the figure the isosurfaces of temperature showing the most intense upwelling thermal convection plumes are plotted.

** Ice formation in supercooled free surface of oceans
**

The fluid is in turbulent convective regime. We use Boussinesq approximation for the water-ice mixture and we employ a dynamic LES model. In the figures: in light blue are plotted the downwelling cold thermal plumes, in gray the ice formation regions. Top figure: fast formation regime: ice is contained inside most intense downwelling plume. Bottom figure: slow formation regime: ice is present in wide areas.

** LES of the flow around two in-tandem plates
**

The flow around two in-tandem plates normal to the free-stream velocity at Re=8000 has been simulated with LES. The obtained vorticity field (upper figure) is compared with experiments (lower figure).

In the movie for the Pressure, counter rotating vortices and three-dimensional structures with fluid ejection in vertical direction are observed [G. Gibertini et al., Flow Around Two In-Tandem Flat Plates: Measurements and Computations Comparison. 5th International Conference on Vortex Flows and Vortex Models (ICVFM2010)]

**Hybrid RANS/LES model**

The periodic hill flow represents a classic test case for hybrid RANS/LES methods. The figure shows a longitudinal velocity visualization and refers to a simulation performed with the hybrid RANS-reconstructed method presented in [A.Abbà et al., “A DG Implementation of a Novel Hybrid RANS/LES Technique With RANS Reconstruction”, http://arxiv.org/abs/1411.4882]. In particular, in these simulations a constant RANS/LES blending factor equal to 0.5 has been considered. The numerical results show a good qualitative behaviour, with a separated flow after the first hill.

View a list of publications related to turbulence modeling and turbulent flows