Zonal modeling is a common technique for the numerical certification of fire-extinguishing systems, however it not valid to simulate complex physical phenomena that occurs near agent injection. We present multi-scale method accurate generation inflow boundary conditions zonal based on description phase change rapidly depressurised mist fire suppression system. The includes characterization inje...

In this paper, we propose a phase-field-based spectral element method by solving the Navier–Stokes/Cahn–Hilliard equations for incompressible two-phase flows. With use of Newton–Raphson Cahn–Hilliard equation and time-stepping scheme Navier–Stokes equation, construct three constant (time-independent) coefficient matrixes solutions velocity, pressure, phase variable. Moreover, invoke modified bu...

Phase change in multiphase flows occurs many natural and industrial applications, e.g., rain formation, internal combustion engines, heat exchangers, reactors, etc. In dense two-phase flows, quantitative experimental results are scarce due to the complexity of configuration techniques limitations. Hence, interest direct numerical simulation such has grown recently better understand access data ...

A multi-phase smoothed particle hydrodynamics (SPH) method for both macroscopic and mesoscopic flows is proposed. Since the particle-averaged spatial derivative approximations are derived from a particle smoothing function in which the neighboring particles only contribute to the specific volume, while maintaining mass conservation, the new method handles density discontinuities across phase in...

In this paper, numerical investigation of upward two phase flow of air-water has been studied. Different conditions of flow regimes including annular, wispy annular, slug, churn and bubbly are simulated based on Hewitt and Roberts map, and a good agreement between the experimental data of the map and the numerical simulation has been observed. Accordingly, a proper CFD model in CFD software of ...

The efficiency and economical performance of sewer systems is an essential issue in urban drainage. The need for sewers to carry sediment has been recognized for many years. One of the main problems in designing sewerage systems is the sediment deposition. Sedimentation in sewers occurs regularly according to the alternating natural flow. The present study investigates the hydraulic characteris...