| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Preconditioned numerical method of compressible flow is advantageous in analyzing the gas-liquid multiphase flow with both compressible and incompressible flow nature. However, there are some difficulties to make clear the unsteady behavior because the time derivative term in the conventional preconditioning method is corrected. In this study, a time consistent numerical method for unsteady multiphase flow was developed. In this method, time and spatial accuracy, numerical stability and convergency are improved by proposing a method which the matrix used for precondition does not affect the unsteady term and can fully exert its role in the computation of the advection term. Through some numerical simulations for steady and unsteady gas-liquid multiphase flows, the validity of the developed method was verified, and the effectiveness and applicability to the problems with strong unsteadiness such as cavitating flow were confirmed.
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