Growth of Three-Dimensional Instability and Onset of Turbulence in Stabilizing and Destabilizing Two-Stream Mixing Layer in a Mildly Curved Duct

摘要

The objective of this paper is to study the growth of three-dimensiinal instability of the subsonic two-stream mixing layer numerically. Stabilizing and destabilizing ocnfigulations are considered and their flow fields are compared. Harten type second order TVD(Total Variation Diminishing) scheme and LU-ADI efficient implicit scheme are applied in order to solve the three-dimensional compressible Navier-Stokes equations without using any turbulence model. The effects of configuration on the instability are discussed by visualizing the vortical structure. The computed results show that three-dimensionality becomes prominent in the case of destabilizing case. Furthermore, intermittent characteristics of the flow are discussed by using the nonlinear dynamics approach.