Direct Numerical Simulation of Shockwave and Turbulent Boundary Layer Interactions PDF Download

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Direct Numerical Simulation of Shockwave and Turbulent Boundary Layer Interactions

Direct Numerical Simulation of Shockwave and Turbulent Boundary Layer Interactions PDF Author: Minwei Wu
Publisher:
ISBN: 9780549008002
Category :
Languages : en
Pages : 292

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Book Description
From the DNS analyses, the shock motion is characterized by a low frequency component (of order 0.01Uinfinity/delta). In addition, the motion of the shock is found to have two aspects: a spanwise wrinkling motion and a streamwise oscillatory motion. The spanwise wrinkling is observed to be a local feature with high frequencies (of order Uinfinity /delta). Two-point correlations reveal that the spanwise wrinkling is closely related to the low momentum motions in the incoming boundary layer as they convect through the shock. The low frequency shock motion is found to be a streamwise oscillation motion. Conditional statistics show that there is no significant difference in the mean properties of the incoming boundary layer when the shock is at an upstream or downstream location. However, analyses of the unsteadiness of the separation bubble reveal that the low frequency shock motion is driven by the downstream flow.