Numerical investigation of mixture generation due to different inlet and outlet positions

Abstract

A numerical simulation is a method carried out to study the flow characteristics of compressible fluid through different channels. Two approaches using air as a working substance were used to study the flow characteristics. In the first approach, two inlets and one outlet horizontally in the x direction was depended on to generate different flow characteristics; the flow properties were calculated along the diagonal line inside the channel. In the second approach, one inlet and outlet horizontally with sudden change in the area of the channel was employed. In this research, the flow properties were calculated along the center line inside the channel and the flow fields have been investigated. A non-linear k-Є model is employed to solve the flow characteristics by using the finite difference method with a curvilinear coordinate system near the dead zone and the k-Є and Reynolds stress model area semi-empirical model based on modeling of the equations of transport that contain the dissipation rate (ε) as well as turbulent kinetic energy (k). The derivation of turbulent kinetic energy and its rate of dissipation derived from the Navier–Stokes equation. In this work, the simulation outcomes of the proposed k-ε turbulence model indicated a good compatibility with published correlations. In order to get an accurate solution, the value of 10–8 for the maximal normalized equation residual was considered to be the convergence between computation and steady solution. The model applied for flow velocity 30 m/s and the obtained results presented as curves, surface and contours for velocities turbulent kinetic energy, rate of dissipation of turbulent kinetic energy and vortices. The builder model can be utilized for academic purposes since it is widely used for many physical and engineering applications.