DOI: 10.1615/TSFP3
DNS OF TRANSITIONAL BOUNDARY LAYER OVER COMPLIANT SURFACES
要約
In this work, the complex interaction of a boundary layer transition flow and the compliant surface is studied using the Spatial Direct Numerical Simulations (SDNS). This is carried out for 2D and 3D unsteady boundary layer flow over compliant surfaces.
Our 2D simulations demonstrated that the Compliant Induced Flow Instability (CIFI) waves could be induced by the presence of finite compliant walls. The coexistence of TS and CIFI wave has made it difficult to study the behavior of the individual waves. Nevertheless, results showed that well-designed compliant surface could reduce the amplification rate and cause the unstable region of TS waves. Computations for 3D linear waves over finite membranes showed that the 3D oblique TS and CIFI waves excited by the same frequency and same spanwise wavenumber disturbance generally propagated at different angles when they traveled downstream. Simulations of subharmonic breakdown over membrane revealed that compliant surfaces could in some instances lessen nonlinear interactions of instability waves in a transitional boundary layer.