Numerical Study on the Supercritical Water Flow Issuing from the Hydrothermal Vent in the Deep Sea

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A flow of the supercritical water heated geothermally from the hydrothermal vent in the deep sea was numerically studied. In order to directly simulate the flow whose temperature rapidly changed from the critical temperature to the low environmental temperature of the deep sea, the new equations were derived from the compressible Navier-Stokes equations. In addition, for the highly-unsteady-flow computation, a new hybrid upwind scheme was developed aimed at stabilizing the high-accuracy computation. The scheme was effective and the supercritical water flow issuing from the hydrothermal vent in the deep sea was simulated for the first time.