| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2008: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Research Abstract |
In this study, for the purpose of elucidating detailed thermofluid phenomena in pebble bed, a nonlinear ultrasound CT system, which could obtain the internal configuration of pebble bed in detail, was tried to construct and numerical simulation which would excluded possible numerical models was performed. From evaluation experiment of the nonlinear ultrasound CT, it was found that CT images were deteriorated by a difference of acoustic refraction between solid and fluid phases. In addition, several problems to resolve for the realization of the CT system were extracted. On the other hand, in the numerical simulation, large-eddy simulation was adopted as a turbulent model, a parallel numerical code was created and detailed simulation for fluid flow in the pebble bed was done.
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