The electrification of particles embedded in a turbulent flow may cause hazards such as spark discharges but is also exploited several industrial applications. Nonetheless, due to its complexity and sensitivity the initial conditions, process build-up particle charge currently not well understood. In order gain deeper understanding this phenomenon, we performed fully resolved numerical simulations charging. More specifically, our study concerned charging dispersed channel at friction...

This article examines the structure and stability of detonations in mixtures gases solid particles via direct numerical simulation. Cases with both reactive inert are considered. First, two-phase flow model is presented assumptions that it based upon discussed. Steady-wave structures admitted by subsequently analysed. Next, algorithm employed for simulations described. It a recently developed high-order shock-capturing compressible flows. The accuracy has been verified through series code...

In this paper we report on a direct numerical simulation (DNS) of turbulent heat transfer in T-junction. particular, study the interaction between two liquid streams, hot horizontal cross-flow and cold vertical jet coming from above, T-junction rectangular cross-section. We discuss detail instantaneous flow structures present results for first- second-order statistics quantities, budget kinetic energy. Further, power spectral density velocity temperature signals at selected locations field....

Purpose This paper sets out to perform a detailed numerical study of turbulent channel flow with strong temperature gradients using large‐eddy simulations. Design/methodology/approach A recently developed time‐accurate algorithm based on predictor‐corrector time integration scheme is used in the Spatial discretization performed collocated grid system flux interpolation technique. technique avoids pressure odd‐even decoupling problem that typically encountered grids. The eddy viscosity...

In this paper, we generalize the concept of low-Mach-number approximation to multi-phase flows and apply it two-phase flow model Papalexandris ( J. Fluid Mech. , vol. 517, 2004, p. 103) for granular materials. our approach, governing system equations is first non-dimensionalized with values that correspond a reference thermodynamic state phase smaller speed sound. By doing so, Mach number based on emerges as perturbation parameter in hand. Subsequently, expand each variable power series...

In this paper, we report on shear flows in domains that contain a macroscopic interface between highly porous medium and pure fluid. Our study is based the single-domain approach, according to which, same set of governing equations employed for both inside pure-fluid domain. particular, introduce mathematical model interest derived directly from continuum theory fluid-saturated granular materials. The resulting variation well-known unsteady Darcy-Brinkman model. First, employ perform linear...

In this paper, we report on a direct numerical simulation (DNS) study of turbulent thermal convection in mixed porous–pure fluid domains. The computational domain consists cavity that contains porous medium placed right above the bottom wall. solid matrix is internally heated which, turn, induces convective motions fluid. Rayleigh number flow pure region order $10^7$ . our study, consider cases different sizes medium, as well with both uniform and non-uniform heat loading matrix. For each...

In this article we introduce a new two-phase model for compressible viscous flows of saturated mixtures consisting carrier fluid and granular material. The mixture is treated as multicomponent fluid, with set thermodynamic variables assigned to each its constituents. volume fraction occupied by the phase spatial gradient are introduced additional degrees freedom. Then, applying classical theory irreversible processes derive algebraic expressions stresses heat flux vectors, momentum energy...