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Numerical study of the influence of a longitudinal sound field on natural convection in a cavity

机译:纵向声场对腔内自然对流影响的数值研究

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Numerical experiments have been performed in order to investigate the convection in an enclosure of aspect ratios 5:1:1.3 subject to a horizontal temperature gradient and a longitudinal sound field. The governing equations are solved by a spectral element method. Different flow structures appear when increasing (or decreasing) the Grashof number. Without acoustic field (acoustic Froude number Fr = 0), a hysteresis occurs connected to a first steady bifurcation with breaking of symmetry, but for Fr ≠ 0, no hysteresis is observed as this symmetry is no more effective. The further transition to oscillatory flow is found to be stabilized by the acoustic field. Depending on Fr, this transition can occur with or without the breaking of the left-right symmetry.
机译:为了研究纵横比为5:1:1.3的外壳中的对流在水平温度梯度和纵向声场的作用下进行了数值实验。控制方程通过频谱元素法求解。当增加(或减少)Grashof数时,会出现不同的流动结构。如果没有声场(弗洛伊德数Fr = 0),则出现磁滞现象并与对称性破坏的第一个稳态分叉相连,但对于Fr≠0,则没有观察到磁滞现象,因为这种对称性不再有效。发现通过声场使向振荡流的进一步过渡稳定。取决于Fr,这种过渡可能会在左右对称性破坏或不破坏的情况下发生。

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