Numerical study of transonic shock buffet instability mechanism

Yi Liu, Gang Wang, Shi Bin Zhu, Zheng Yin Ye

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

Abstract

An investigation on transonic shock buffet instability mechanism by applying a combination of numerical simulations and dynamic mode decomposition (DMD) is presented. The unsteady flow simulations over OAT15A and NASA(SC)-0714 supercritical airfoil were performed by using unsteady Reynolds average Navier-Stokes equations with SA turbulent model, results are validated based on experimental data and analyzed by DMD. DMD was employed to extract the dynamic modes which describe the underlying global flow structure from flow field, the eigenvalues give frequency and growth rate corresponding to dynamic modes. The analysis results show that the buffet onset and buffet frequency analysed by dynamic mode decomposition agrees well with the available experimental data. The unsteadiness onset of flow is closely related to the instability of shear layers located between the separation and freestream, this unsteadiness drives the separation bubble broken and detach from airfoil periodically, which leads to the shock traveling along the upper surface.

Original languageEnglish
Title of host publication46th AIAA Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624104367
DOIs
StatePublished - 2016
Event46th AIAA Fluid Dynamics Conference, 2016 - Washington, United States
Duration: 13 Jun 201617 Jun 2016

Publication series

Name46th AIAA Fluid Dynamics Conference

Conference

Conference46th AIAA Fluid Dynamics Conference, 2016
Country/TerritoryUnited States
CityWashington
Period13/06/1617/06/16

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