| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Outline of Final Research Achievements |
Hydrothermal convective flows found in geothermally heated water issuing from hydrothermal vents at the seafloor are numerically studied. The heated water in the deep sea sometimes is in the supercritical state because its temperature and pressure exceed the critical values. The issued supercritical water is cooled by the cold ambient water and rapidly changes into a liquid state, which is accompanied by significant changes in the density and the other physical properties.
To investigate the flow structure of the sub- and supercritical water in the deep sea, the compressible Navier-Stokes equations are solved using a method usually used in incompressible flow computations introducing a highly robust scheme to stabilize the high-accuracy computation.
The computational results clearly showed that complexity and the unsteadiness of the flow were significantly influenced by whether the issuing high temperature water was in the supercritical state or not.
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