Japan Explosive Society
Dr. Junya Aono
Numerical simulation of elliptic bubble deformation by underwater shock wave
Dr. Junya Aono has revealed the mechanism of deformation and collapse of elliptical bubbles due to interactions with underwater shock waves by numerical simulations using a novel compressible multiphase flow simulation method, Modified-SLAU2 for compressible two-fluid six-equation model, which was developed by his team.
Although the mechanism of the deformation and collapse for circular bubbles with underwater shock waves has been known previous studies, this research reveals the mechanism of the deformation and collapse for elliptical bubbles.
Regardless of the inclination angle of the elliptical bubble with respect to the shock wave, a high-pressure region occurs at both ends of the long axis of the elliptical bubble. A liquid-phase microjet is generated from the high-pressure areas, leading to collapse. Furthermore, as the bubble flattens, the shock waves generated by the collapse increase the risk of damage to the surrounding fluid machinery.
In light of his exceptional contributions and the promising implications of his work, we firmly believe that Dr. Aono is highly deserving of the Encouragement Award. His pioneering research and understanding of elliptical bubbles with underwater shock wave interactions we seek to recognize and encourage.