排序方式: 共有46条查询结果,搜索用时 15 毫秒
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本文研究了无粘不可压慢扩张旋转流的稳定性问题,采用多重尺度展开法对有慢扩张的旋转流的非对称扰动进行浅化稳定性研究,导出了零阶及一阶扰动模所应满足的微分方程及由于慢扩张引起振幅变化的控制方程,将Plaschko关于慢扩张喷流的结果推广到具有慢扩张的旋转流情况。 相似文献
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Linear Rayleigh-Taylor instability analysis of double-shell Kidder's self-similar implosion solution
This paper generalizes the single-shell Kidder's self-similar solution to the double-shell one with a discontinuity in density across the interface. An isentropic implosion model is constructed to study the Rayleigh-Taylor instability for the implosion compression. A Godunov-type method in the Lagrangian coordinates is used to compute the one-dimensional Euler equation with the initial and boundary conditions for the double-shell Kidder's self-similar solution in spherical geometry. Numerical results are obtained to validate the double-shell implosion model. By programming and using the linear perturbation codes, a linear stability analysis on the Rayleigh-Taylor instability for the double-shell isentropic implosion model is performed. It is found that, when the initial perturbation is concentrated much closer to the interface of the two shells, or when the spherical wave number becomes much smaller, the modal radius of the interface grows much faster, i.e., more unstable. In addition, from the spatial point of view for the compressibility effect on the perturbation evolution, the compressibility of the outer shell has a destabilization effect on the Rayleigh-Taylor instability, while the compressibility of the inner shell has a stabilization effect. 相似文献
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高Reynolds数下湍流边界层的尺度律 总被引:1,自引:0,他引:1
在过去的10多年内,对于高$Re$数零压力梯度湍流边界层,存在着关于平均速度的尺度律以及近壁区流动是否是普适的争论.介绍了这些争论的最近的态势. 看来, 对于这些争论还远不能得出结论. 相似文献
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