| Budget Amount *help |
¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2010: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2009: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2008: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Research Abstract |
To improve the accuracy of the numerical simulation technique for unsteady cavitating flows in hydro-machineries, we investigated some selected topics : sub-grid scale modeling of turbulent flows ; a method for analyzing the instabilities taking into account the pipeline response ; and a numerical method to capture the gas-liquid interface considering the thermodynamic effects. We improved the mathematical model to represent the turbulence modulation due to the cavitation. In addition, all kind of flow instabilities observed in pumps due to the cavitation, such as rotating cavitation and cavitation surge, were successfully reproduced by our method. The issue about the thermodynamic effect has been rearranged to a new research project.
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