Most real life bubble dynamics applications involve multiple bubbles, for example, in cavitation erosion prevention, ultrasonic baths, underwater warfare, and medical applications involving microbubble contrast agents. Most scientific dealings with bubble-bubble interaction focus on two similarly sized bubbles. In this study, the interaction between two oscillating differently sized bubbles (ge...

The flow control on the separation bubble and the large scale vortex is important in the turbo machine. Recently, a new approach using the plasma actuators is proposed to control the separation bubble and the large scale vortex. The aim of this study is to control the large scale vortex behind a flat plate using the plasma actuators. The effect of the three dimensional jet induced by the plasma...

The objective of this study is to develop direct numerical simulations (DNS) investigate the aerodynamic performance, transition turbulence, and capture laminar separation bubble occurring on a wind turbine blade. Simulations are conducted with spectral/hp element method details flow over blades NACA-4412 airfoil at wide range design parameters. This chosen because recent studies have shown tha...

Direct numerical simulation data of a 24 compression ramp configuration are used to analyze the shock motion. The characteristic frequencies in the incoming boundary layer are reported for reference. The shock wave motion exhibits high-frequency spanwise wrinkling, as well as low-frequency streamwise motion. Correlations between the incoming flow and the shock motions, as well as the downstream...

The growth and breakdown of localised disturbances into a turbulent spot in a Mach 2 boundary-layer flow have been investigated by direct numerical simulation. In particular, the interaction of a turbulent spot with a shock-induced separation bubble is studied. The primary vortex structures triggered by the injected low momentum fluid and the metamorphosis of the hairpin structures into a turbu...

Enhancing mixing is of uttermost importance in many laminar microfluidic devices, aiming at overcoming the severe performance limitation of species transport by diffusion alone. Here we focus on the significant category of microscale co-laminar flows encountered in membraneless redox flow cells for power delivery. The grand challenge is to achieve simultaneously convective mixing within each in...

The influence of the wing root junction on laminar separation bubble forming suction surface a semispan NACA 0018 cantilevered from wind tunnel test section wall is studied using flow visualisations, particle image velocimetry and pressure measurements at chord Reynolds number 125 000 an angle attack 6 $^\circ$ . boundary layer upstream turbulent, spanwise extends well beyond thickness. Substan...