Abstract The onset and the nature of dynamic instabilities experienced by wake a marine propeller set in oblique flow are investigated means detached eddy simulations. In particular, destabilization process is inspected systematic comparison morphology operating pure axisymmetric drift with angle 20°, under different loading conditions. behaviour shows markedly character respect to condition: latter, triggered an increasing interaction main vorticity confined tip vortex; whereas, former,...

The Smoothed Particle Hydrodynamics (SPH) method, often used for the modelling of Navier–Stokes equations by a meshless Lagrangian approach, is revisited from point view Large Eddy Simulation (LES). To this aim, LES filtering procedure recast in framework defining filter that moves with positions fluid particles at filtered velocity. It shown SPH smoothing can be reinterpreted as sort filtering, and that, besides terms coming convolution, additional contributions (never accounted literature)...

The vortex–body interaction problem, which characterizes the flow field of a rudder placed downstream single-blade marine rotor, is investigated by numerical simulations. particular topology propeller wake, consisting helicoidal vortex detached from blade tips (tip vortex) and longitudinal, streamwise oriented originating at hub (hub vortex), embraces two representative mechanisms collisions: tip vortices impact almost orthogonally to mean plane, whereas travels in plane wing (rudder),...

Modal decomposition techniques are used to analyse the wake field past a marine propeller achieved by previous numerical simulations (Muscari et al. Comput. Fluids , vol. 73, 2013, pp. 65–79). In particular, proper orthogonal (POD) and dynamic mode (DMD) identify most energetic modes those that play dominant role in inception of destabilization mechanisms. Two different operating conditions, representative light high loading considered. The analysis shows strong dependence temporal spatial...

The present work deals with some recent developments regarding the inclusion of Large-Eddy Simulation (LES) in weakly compressible Smoothed Particle Hydrodynamics (SPH) framework. Previously {see Di Mascio et al. [Phys. Fluids 29, 4 (2017)]}, this goal was achieved by applying a Lagrangian filter to Navier–Stokes equations for fluids and, then, approximating differential operators SPH fashion. Since nature derived scheme turned out be an obstacle accurate simulations high Reynolds number...

An ever-increasing number of engineering problems regard the numerical simulation fluid flows with high-density ratio, shock wave onset, and different chemical species. In such conditions, obtaining reliable results depends on ability algorithm to offer a stable robust time space discretization governing equations while simultaneously limiting diffusivity. This work presents extension assessment low-dissipative Navier–Stokes solver for compressible, multi-specie flows. We first studied...

An Eulerian fluid-dynamic code for simulating compressible, multi-phase flows with phase transition modeling was developed. The features a low-dissipative flux-splitting discretization scheme, real-fluid library to properly describe thermophysical properties, and model thermal non-equilibrium. Large Eddy Simulations of the internal near nozzle flow fuel injector were carried out assess capabilities developed approach. X-ray measurements iso-octane injections exploited validation purposes....

Hydrodynamic cavitation is a promising technology for several applications, like disinfection, sludge treatment, biodiesel production, degradation of organic emerging pollutants as pharmaceutical, and dye degradation. Due to local saturation conditions, cavitating liquid exhibits generation, growth, subsequent collapse vapor-filled cavities. The cavities' brings very high pressure temperature; this last aspect essential in some chemical processes because it induces the decomposition water...

Underexpanded jets are present in various engineering applications; recent years, they have gained special attention because of the development gaseous-fueled propulsion systems. In these apparatuses, direct injection fuels such as hydrogen innovative low-emission engines' chambers induces turbulent under-expanded jets. this study, we performed high-fidelity Large Eddy Simulations to investigate flows and provide valuable insights for developing injectors suitable and, more generally, We...

Hydrogen production through water electrolysis is a cornerstone of sustainable energy strategies, especially when powered by renewable electricity. Among the different technologies, flow cell electrolysers employing foam electrodes offer promising scalability and efficient gas removal. However, relationship between electrolyte uniformity electrochemical performance remains underexplored. In this work, we investigate influence on overpotential in electrocatalytic cells combining Computational...