Unsteady Flow Simulation Around Moving Boundary with Adaptive Cartesian Grid Method

2008 ◽  
Author(s):  
Toshihiro Kamatsuchi ◽  
Takahiro Fukushige ◽  
Kazuhiro Nakahashi
Keyword(s):  
Unsteady Flow ◽  
Moving Boundary ◽  
Flow Simulation ◽  
Grid Method ◽  
Cartesian Grid ◽  
Cartesian Grid Method ◽  
Adaptive Cartesian Grid ◽  
Unsteady Flow Simulation

Development of Cooling Structures for Blu-Ray Disc Compatible Optical Disc Drives Using Computational Fluid Dynamics Based on Cartesian Grid Method

2007 ◽  
Author(s):  
Nobuyuki Isoshima ◽  
Takayuki Fujimoto ◽  
Yukinobu Abe ◽  
Masatoshi Watanabe ◽  
Yoshiaki Yamauchi ◽  
...  
Keyword(s):  
Laser Diode ◽  
High Speed ◽  
High Performance ◽  
Flow Simulation ◽  
Grid Method ◽  
Ambient Air ◽  
Cartesian Grid ◽  
Optical Disc ◽  
Rotating Disc ◽  
Cartesian Grid Method

High-performance, simple cooling structures for optical disc drives compatible with the Blu-ray disc (BD) were developed using unsteady numerical flow simulation based on the Cartesian grid method. In the new structure, an additional hole in the tray outside of the disc induced a secondary upward flow, which is caused by a pressure difference and rotating-disc flow. The secondary flow decreases the ambient air-temperature of the laser diode below the hole, and furthermore it increases the velocity around the laser diode and enhances the heat transfer rate. The experimental results indicate that the cooling effect of the laser diode increases, and the disc vibration is not influenced by the additional hole in the tray. The cooling structures are applied to the so-called super-multi BD drive, which achieved 4X high-speed recording for the first time in the industry.

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