Complex Shock Wave Laboratory

Complex Flow Research Division

Complex Shock Wave Laboratory

Concurrent Professor
Shigeru
Obayashi
Associate Professor
Mingyu
Sun

We are devoted to research on compressible multiphase flows, especially accompanied by shock waves, such as laser-induced liquid jet, and explosive volcano eruption. Currently, we are developing a general-purposed numerical technique using solution-adaptive grids and hybrid grids, by modeling subgrid-scale interfacial phenomenon.

Numerical modeling of laser induced liquid jet

A laser-induced Liquid Jet (LILJ) can cut soft tissues , while preserving blood vessels, which has been reported in clinical liver operations. Compared with the conventional pumps, the LILJ is excellent in the point in which an intermittent pulsed jet is possible, and the point of not having electromagnetic influence on surrounding medical equipment. We have established a numerical model that can analyze the jets for general applications.

Defragmentation of high pressure bubbles and liquids in channel

The magma ejection in an explosive volcanic eruption is modeled as high-pressure bubbles in liquid, which is a compressible gas-liquid two phase phenomenon. We have developed a sharp interface method that can resolve subgrid-scale bubbles using the advection equation of surface normal. The expansion, breakup and coalescence of bubbles are considered. The influences of the initial pressure and void rate of the gas bubbles on the volcanic eruption phenomenon are analyzed.

Numerical analysis of optical visualization systems

A technique to analyze optical visualization methods for compressible flows, such as shadowgraph and Schlieren methods that make use of light refraction, has been developed. The light rays that pass the whole optical system including a flowfield are traced, faithfully based the principle of geometric optics. The influence of optical elements and arrangement of these elements can be analyzed.

Complex Shock Wave Laboratory