Topological Study of the Compressible Rotating Flows

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There are two main topics achieved n the present research1. Uniformly sheared turbulent flowsThe structure and dynamic of coherent vortex tubes in the zero-absolute-vorticity state (ZAVS), which is realized in a rotating uniform shear flow with zero mean absolute vorticity, are investigated by the use of the results of a direct numerical simulation. A coherent vortex tube consists of two parts, one is the two end parts and the other is a rather uniform intermediate part between two ends. The generation of Reynolds shear stress is activated in the regions near the end parts. The end parts also play a role to sustain the Reynolds stress in the central part of the vortex tube by maintaining its inclination angle.2. Rotating flows in a dosed domainThe silicon wafer washer includes the process spouting the cleaning solution with wafer rotating. This process causes the problem of droplet corrodes the non-protected wafer backside. There are two reasons. For clearing out this mechanism, the fluid in the washer was analyzed with FLUENT the universal CFD code. In the 2D liquid film analysis, it is revealed that the wall adhesion power, the surface tension, and the shape of the wafer corner caused the liquid film turning around.