Trident convection in a cube

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  • 立方体内の三叉対流
  • リッポウタイナイ ノ ミツマタ タイリュウ

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Abstract

We numerically investigate thermal convection in a cubic cavity. Thermal convection in a cube is induced heating from one wall and chilling from its opposite wall in the terrestrial-gravity and zerogravity fields with and without a sinusoidal modulation. The gravity and its modulation are parallel to the temperature gradient. An incompressible fluid with Prandtl number Pr = 7.1 (water) is considered and hence the Boussinesq approximation is used. We have reported a new flow structure which consists of a pair of trident currents. This previously-unidentified flow is not so weakly-stable but rather durable, and can be observed not only in a stationary cube under the terrestrial gravity, but also in an oscillating cube under the terrestrial gravity and zero gravity.

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