We discuss the development of a simplified model for the jet noise source that can be used in practical predictions of installed noise. In the proposed scheme, the source is prescribed on a radiator surface defining the boundary between the inner rotational jet flow and the outer linear pressure field. The source consists of wavepacket-type partial fields whose noise propagation can be computed...

Occupant health is related to particle contaminants in enclosed environments, so it is important to study particle transport in spaces to quantify the rates and routes of potential disease transmission. In many cases, particle contaminants in an enclosed space are generated from an unsteady source. This investigation used the experimental data from two steady-state cases as well as one transien...

In this study, a 3D combustion chamber was simulated using FLUENT 6.32. Aims to obtain accurate information about the profile of the combustion in the furnace and also check the effect of oxygen enrichment on the combustion process. Oxygen enrichment is an effective way to reduce combustion pollutant. The flow rate of air to fuel ratio is varied as 1.3, 3.2 and 5.1 and the oxygen enriched flow ...

A modification has been done in the normal injection hole of 35◦, by injecting the cold fluid at different angles(compound angle) in lateral direction, providing a significant change in the shape of holes which later we found in our numerical investigation giving good quality of effectiveness in cooling. Different L/D ratios are also studied for each compound angle. The numerical simulation is ...

The forward expansion hole improves the film cooling effectiveness by reducing penetration of coolant jet into main flow compared to cylindrical holes. In addition, compound angles improve promoting lateral spreading on a wall. Evidently, combination angle and shaped further adiabatic effectiveness. with 15° expansion, 35° inclination angle, 0° 30° at 0.5 1.0 blowing ratios was numerically simu...

The underexpanded microjet emerging from a rectangular convergent nozzle with high aspect ratio at the exit is investigated numerically using Reynolds-averaged Navier-Stokes (RANS) simulation Menter’s shear stress transport (SST) k-ω turbulence model. performed pressure of 5.0 to produce strong shock and it validated by comparison rainbow schlieren picture microjet. three-dimensional structure ...

Flows around an axisymmetric body of revolution at a zero yaw angle were studied using hybrid Reynolds-averaged Navier–Stokes (RANS)/large eddy simulation (LES) approach, which employed full Reynolds stress model (RSM) in the RANS branch with aim accounting for anisotropy, streamline curvature, and flow separations boundary layer. The SUBOFF without appendages was applied to conduct simulations...

In this study, modeling of a fuel jet which has been injected by high pressure into a low-pressure tank are investigated. Due to the initial conditions and the geometry of this case and similar cases (like CNG injectors in internal combustion engines (ICE)), the barrel shocks and Mach disk are observed. Hence a turbulence and transient flow will be expected with lots of shocks and waves. Accord...

For jets, large eddy resolving simulations are compared for a range of numerical schemes with no subgrid scale (SGS) model and for a range of SGS models with the same scheme. There is little variation in results for the different SGS models, and it is shown that, for schemes which tend towards having dissipative elements, the SGS model can be abandoned, giving what can be termed numerical large...