Numerical and Experimental Studies on the Separation Topology of the MVG Controlled Flow at M=2.5

Abstract

In this paper, the implicitly implemented LES method and fifth order bandwidthoptimized WENO scheme are used to make comprehensive studies on the separation topology of the MVG controlled flow at M=2.5 and Re θ

LES investigation into the generation of momentum deficits in the supersonic wake of a micro-ramp

“…As a result, the downstream vortex pair is considered as the major role throughout the extension of streamwise wake. However, the LES study of Li et al [9] proposed another answer in a three dimensional point of view. In their study, the deficit region was traced to originate in the upstream turbulent boundary layer.…”

“…These features were later confirmed qualitatively by the LES results of Lee and Loth [2] . Benefited from the high order scheme which is able to resolve detailed turbulent structures, the LES study of Li et al [9] summarized several other flow features, such the ring vortex generated by the Kelvin-Helmholtz (K-H) instability at the circular shear layer. The momentum deficit and primary vortices were again validated qualitatively there [9] .…”

“…Benefited from the high order scheme which is able to resolve detailed turbulent structures, the LES study of Li et al [9] summarized several other flow features, such the ring vortex generated by the Kelvin-Helmholtz (K-H) instability at the circular shear layer. The momentum deficit and primary vortices were again validated qualitatively there [9] . Since these two features are especially significant in the wake of the microramp, a question would be raised regarding the connection between them: Is the momentum deficit a result of the primary vortices, or where is the origin of the low momentum fluid in the deficit region?…”

“…Although the effects have been demonstrated through the foregoing studies, the flow physics of the microramp has not been fully understood due to the complex geometry of current device. Abundant efforts have been recently devoted to investigate the flow properties through both numerical [9][10][11][12] and experimental [13][14] methods. The major features including the momentum deficit and the primary vortex pair were originally visualized by Holden and Babinsky through wind tunnel experiments [5] .…”

“…In order to consolidate the observation of Li et al [9] , the flow around the micro-ramp was simulated by means of LES with high order high resolution difference scheme in the present study. In the following sections, the numerical algorithm and grid discretization are going to be explained firstly.…”