E132 立方体箱内の熱塩対流の超臨界状態(E-13 遷移と不安定性(3),一般講演)

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  • E132 Super Critical States in the Thermohaline Convection in a Cubic Box

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Thermal convection in a cubic box is studied numerically by use of the fractional step method with 4th order spatial accuracy. In the undisturbed state, the temperature field is conductive, heated at the bottom, whereas the salinity is a linear function of the vertical coordinate, the most dense at the bottom. Time-evolution calculations show that the critical Rayleigh number over which the undisturbed state becomes unstable, increases as nearly the linear function of the salinity Rayleigh number. It is interesting that in the super critical state, the field exhibits oscillating behavior if the Rayleigh number is not far from the critical value, when one convection cell with its axis parallel to the horizontal plane, rotates around the vertical axis.

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