【摘要】 把周恒提出的人为中性方法推广应用于二次稳定性理论,并计算了平面Poiseuille流三维亚谐扰动的二次稳定性问题。结果表明,本文提出的方法是研究亚临界过渡过程的有效方法,克服了现有二次稳定性理论必须有二维平衡态的局限性,扩大了它的应用范围。更多还原

【Abstract】 The artifical neutral method proposed by Zhou is extended to study the three dimensional subharmonic secondary instability of plane Poiseuille flow. The numerical results show that the method proposed in this paper is an effective one to investigate transition in subcritical range, thus removing the shortage of the original theory of secondary instability which requires two dimensional basic flow in equilibrium stste, and can be applied widely.更多还原