Though the most unstable T-S wave was of second mode for laminar flow, the first mode waves played the key role in the breakdown process in laminar-turbulent transition. 虽然在层流下第2模态TS波更不稳定,但在层流突变为湍流的过程中,第1模态不稳定波也起了重要作用。
Direct numerical simulation was done for a supersonic boundary layer, to see if the mechanism for the generation of sub-harmonic waves, similar to those for the incompressible flows, existed in the process of laminar-turbulent transition. 通过直接数值模拟的方法,探讨在超音速边界层的转捩问题中,是否存在和不可压缩流情况相似的产生亚谐波的机制。
The investigation of laminar-turbulent transition is the most challenging task in the area of modern fluid dynamics, and it is crucial importance in the design of modern high-performance aerodynamic vehicles. 关于层流&湍流的转捩的研究是现代流体力学中最具有挑战性的一个课题,对现代高性能飞行器的设计具有重要的意义。
Temporal mode direction numerical simulation ( DNS) has been done for the process of laminar-turbulent transition and the fully developed turbulence in an incompressible boundary layer on a flat plate. 本文采用直接数值模拟(DNS)的方法,模拟了平板边界层的转捩过程及充分发展的湍流。
Laminar-turbulent transition is an old yet unsolved problem. 层流-湍流的转捩是一个古老但依然没有解决的问题。