The paper reports a numerical study concerning the effect of high-frequency small-amplitude vibration on the onset of thermal convection in a fluid-porous layer in the gravitational field. It is found that vertical vibration stabilizes the thermally conductive state of the fluid heated from below. Local convection in the fluid sublayer is replaced by the large-scale one with increasing the value of oscillatory forcing. The latter convection covers the entire layer. In the case of horizontal vibration, the stabilization manifests itself at low vibrational accelerations. Their further growth reduces the stability threshold and causes an abrupt transition to a new type of convection called “interfacial” convection. It arises in the form of the rolls locating near the interface between the fluid and porous sublayers. The nature of interfacial convection is due to the thermal vibrational force alone, since it occurs in the layer heated from above where the natural thermal gravitational convection is impossible to be excited.

该论文报告了一项关于高频小振幅振动对重力场中流体多孔层中热对流开始影响的数值研究。发现垂直振动稳定了从下方加热的流体的导热状态。随着振荡强迫值的增加，流体亚层中的局部对流被大规模对流所取代。后一种对流覆盖整个层。在水平振动的情况下，稳定性在低振动加速度下表现出来。它们的进一步增长降低了稳定性阈值，并导致突然过渡到一种称为“界面”对流的新型对流。它以位于流体和多孔亚层之间界面附近的辊的形式出现。