Transition research under NASA’s Aeronautical Sciences Project seeks to develop a validated set of variable fidelity prediction tools with known strengths and limitations, so as to enable “sufficiently” accurate transition prediction and practical transition control for future vehicle concepts. This paper builds upon prior effort targeting the laminar breakdown mechanisms associated with statio...

In this paper, we study the primary atomization characteristics of liquid jet injected into a gaseous crossflow through direct numerical simulations (DNS) and large eddy (LES). The DNS use coupled level set volume fluid (CLSVOF) sharp interface capturing method resolving all relevant scales to predict drop size distribution (DSD) for drops larger than grid spacing. LES (VOF) diffused modelling ...

Liquid jet in crossflow (LJIC) is a process which high-speed gas deforms and shears continuous liquid flow into tiny droplets. This study quantifies the surface motion of LJIC during primary breakup process, has not been quantified due to optical limitation close nozzle exit. The interfacial velocity breaking indicates local interaction flows determines initial stripped velocities have only est...

Investigation of the near field dynamics a single and tandem array three jets are provided by 2-D time-resolved particle image velocimetry (TR-PIV) measurements. Instantaneous velocity fields examined in transverse spanwise planes with jet to crossflow ratios range from 0.9 1.7. Previous studies have shown that for high ( $$\ge$$ 2), leading provides sufficient shielding ensure all downstream e...

Modelling the complete flow physics and chemical kinetics of supersonic combustion is a particularly complex daunting task that requires significant computational resources. To foster performance evaluation tools for future hypersonic vehicles, developing accurate yet computationally efficient solution methods great importance. In this work, new subgrid model large eddy simulations derived used...

The convective heat transfer in a turbulent boundary layer (TBL) on flat plate is enhanced using an artificial intelligence approach based linear genetic algorithms control (LGAC). actuator set of six slot jets crossflow aligned with the freestream. An open-loop optimal periodic forcing defined by carrier frequency, duty cycle and phase difference between actuators as parameters. laws are optim...