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中文摘要：
对槽道流的常规转捩直接数值模拟发现，在转捩“breakdown”即将发生时，除个别T-S波以外，流场中较大幅值的波都已经停止增长；在转捩“breakdown”发生前到发生过程中的短时间内，非线性作用没有明显变化的情况下，典型未增长起来的波的实际增长率却增加了2个数量级以上．分析表明，平均流剖面稳定性改变使非线性作用的支持相对于衰减率有了明显的优势，于是流场中占大多数的长期受衰减率抑制的未增长起来的波能够急速增长，导致转捩的“breakdown”过程迅速完成．
英文摘要：
Laminar-turbulent transition of channel flow was simulated by the means of direct numerical simulation. Just before breakdown most of the developed T-S waves had stopped rising; during the short time from before to among the breakdown process, the actual growth rate of typical undeveloped waves increased over two orders of magnitude without obvious change of non-linear effect. The results show that, the sustain of non-linear effect gains obvious advantages over the decay rate of waves since the change of stability of the mean flow profile, and then those undeveloped waves that had been restrained by their decrease rate for long time increase rapidly, which account for the majority in flow field that lead transition breakdown to accomplish rapidly.
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