Vortex breakdown of swirling, round jet flows is investigated in the compressible, subsonic regime by means of Direct Numerical Simulation (DNS). This is achieved by solving the compressible Navier–Stokes equations on a cylindrical grid using high-order spatial and temporal discretization schemes. The Reynolds number is Re = ρ c w ◦ c R ◦/μ◦c = 5000 and the flow is moderately compressible with ...

The presence and properties of acoustic peaks near the nozzle impinging rocket jets have been investigated. Four at a Mach number 3.1 on plate distance L = 15 r 0 , 20 25 30 from nozzle, where is radius, computed using large-eddy simulations. In all cases, upstream-travelling pressure waves are generated by jet impingement plate, with amplitudes decreasing nozzle-to-plate distance. near-nozzle ...

High-fidelity large-eddy simulations (LESs) are performed to investigate aeroacoustic characteristics of jets issuing from twin rectangular nozzles with an aspect ratio 2:1 at two overexpanded conditions and the design condition. For all three jet simulated, LES predicts qualitatively similar near-field flow statistics those measured University Cincinnati. Using Ffowcs Williams-Hawkings method,...

Abstract The Siberian storm track is one of the drivers East Asian extreme weather events. Using daily JRA‐55 reanalysis data from 1980 to 2021, this study examines roles eddy generation and jet characteristics in setting annual cycle track. It found that there are two peaks intensity boreal spring autumn. possible reason for such an explored by analyzing maximum Eady growth rate over region ch...

in this study, the effect of suction and the parameters such as suction amplitude, suction coefficient and suction jet length on naca0012 was evaluated. the turbulence employed model was the rsm model. suction jet is located in 10% of the chord length. the range of suction jet entrance velocity was selected from 0.1 to 0.5 of freestream velocity. the maximum increase in lift to drag ratio was s...

Air curtains (ACs) employ plane turbulent jets to separate two environments in terms of heat and mass transfer, while still allowing unrestricted access through the opening between these environments. Most previous studies focused on ACs discharged from nozzles located just above opening. However, some cases have be installed close ceiling at a substantial distance top The AC blown downwards al...

An unsteady numerical simulation method was used in order to explore more efficient atomization methods for liquid fuel scramjet combustors and study the influence of different shock wave incident positions on characteristics kerosene crossflow. The wedge compression surface generate wave, position jet controlled by changing angle surface. inlet Mach number 2.01; total temperature 300 K, moment...

one of the world's major mineral dust source regions lies along the border between iran and afghanistan. in this studyit is hypothesized that a low-level jet may play in role in generating the intensity of this source region. the presence of alow-level jet east of the seistan mountains is documented here for the first time. the jet exists mainly from may toseptember and has a core at 850 mb. ma...