Turbulent flow separation coupling heat transfer with the solid case in the high area ratio rocket nozzle is simulated with the CFD method and the results are investigated experimentally. The finite volume method, the 2nd order upwind scheme, SST k-ω turbulence model and enhanced wall function are employed to solve the N-S equation and thermal conduction equation. To predict the fluid field and...

The present study reported of the numerical investigation of a high-speed wet steam flow through an asymmetric nozzle. The spontaneous non-equilibrium homogeneous condensation of wet steam was numerically modeled based on the classical nucleation theory and droplet growth rate equation combined with the field conservations within the computational fluid dynamics (CFD) code of ANSYS Fluent 13.0....

Managing and improving the air quality across urban areas can be achieved by studying transport behaviour of pollutants. In this work, effects varying wind angles increasing concentration on pollutant dispersion from cooling towers to area were investigated using computational fluid dynamics (CFD) software; OpenFOAM modified k-ω SST turbulence closure acquire steady-state flow field based Reyno...

The geometry of a conventional two-bladed Savonius rotor was used in this study based on report available the literature. A two-dimensional model consisting two buckets and an overlap ratio 0.1 prepared. unsteady Reynolds averaged Navier-Stokes (URANS) equations eddy-viscosity turbulence SST k-ω were employed order to solve fluid motion numerically. Instantaneous velocities pressures calculated...

This research paper presents the CFD analysis of oscillating airfoil during pitch cycle. Unsteady subsonic flow is simulated for pitching airfoil at Mach number 0.283 and Reynolds number 3.45 millions. Turbulent effects are also considered for this study by using K-ω SST turbulent model. Two-dimensional unsteady compressible Navier-Stokes code including two-equation turbulence model and PISO pr...

Due to its distinct capability to improve the efficiency of shale gas production, supercritical carbon dioxide (SC-CO2) fracturing has attracted increased attention in recent years. Heat transfer occurs in the transportation and fracture processes. To better predict and understand the heat transfer of SC-CO2 near the critical region, numerical simulations focusing on a vertical flow pipe were p...

This research paper presents the CFD analysis of oscillating airfoil during pitch cycle. Unsteady subsonic flow is simulated for pitching airfoil at Mach number 0.283 and Reynolds number 3.45 millions. Turbulent effects are also considered for this study by using K-ω SST turbulent model. Two-dimensional unsteady compressible Navier-Stokes code including two-equation turbulence model and PISO pr...

The k-ω Shear Stress Transport (SST) turbulence model is adopted to study the hydrodynamic performance of the water-jet axial pump which is applied in Unmanned Surface Vehicle (USV). The numerical simulation of the whole passage of the water-jet pump is carried out for four different tip clearance with δ = 0.3 mm, δ = 0.8 mm, δ = 1 mm and δ = 1.4 mm. And the results, in term of external charact...

The goal of this research is to improve and validate a Reynolds Averaged Navier–Stokes (RANS) turbulence model perform accurate Computational Fluid Dynamics (CFD) simulations the urban wind flow. k-ω SST selected for calibration since its blended formulation holds remarkable optimization potential has increased relevancy in recent studies field. A simulation-based approach recalibrates closure ...

The frequent switching of pump mode and turbine the leads to transient phenomena. To ensure safe stable operation unit, a detailed study on exhaust pressurization process when unit switches from has been carried out. Based Shear Stress Transfer model (SST) k–ω turbulent model, numerical simulations are processed both in steady unsteady state. visualization results gas–liquid two phases distribu...