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Mechanism of Breakdown in Laminar-Turbulent Transition of Incompressible Boundary Layer on a Flat Plate 总被引：2，自引：0，他引：2
Temporal mode direct numerical simulation was done for the process of laminar-turbulent transition in an incompressible boundary layer on a flat plate. The analysis of the results showed that during the breakdown process of laminar-turbulent transition, the modification of the mean flow profile by the disturbances led to a remarkable change in its stability characteristics, manifested in the significant enlargement of the linear unstable zone and the maximum amplification rate, and led to that many more disturbances were excited and enhanced rapidly, correspondingly the turbulent energy also increased rapidly, and the mean flow profiles evolved swiftly from laminar to turbulent. It was also found that if the oblique waves in the initial disturbances did not form symmetrical pairs, the subsequent span-wise mean velocities would, in general, be nonzero due to nonlinear interaction, which would have a great effect on the stability characteristics and also implied that the turbulence obtained by direct numerical simulation might not be fully a random process. 相似文献
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采用伪谱方法中的Ｃｈｅｂｙｓｈｅｖ－τ方法和配置点方法，分别研究了平面Ｐｏｉｓｅｕｉｌｅ流中扰动的非线性演化问题，并进行了比较．结果表明，在中性情况附近，配置点方法的精度要高于Ｃｈｅｂｙｓｈｅｖ－τ方法的精度． 相似文献
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