Global Shock Buffet Instability on NASA Common Research Model



Timme, Sebastian ORCID: 0000-0002-2409-1686
(2019) Global Shock Buffet Instability on NASA Common Research Model. In: AIAA Scitech 2019 Forum, 2019-1-7 - 2019-1-11, San Diego, CA.

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Abstract

A numerical study of the transonic flow over the wing of the NASA Common Research Model, specifically addressing the shock-buffet instability via global mode analysis, is discussed. Reynolds-averaged Navier–Stokes equations (coupled with a one-equation turbulence model), using an industrial computational fluid dynamics package, are used as aerodynamic model. The implicitly restarted Arnoldi iteration is applied for eigenmode computation. Large but sparse linear systems of equations, arising from shift-and-invert spectral transformation, require a sparse iterative linear equation solver. The results show how the fluid-only shock-buffet onset flow for three-dimensional wings can be linked to an absolute instability. The instability’s frequency and spatial structure agree with those typically reported for similar swept-wing geometries using experimental analysis and databased modal identification. The influence of symmetry boundary condition (for the half model) compared with the full-span configuration is scrutinised. Overall the results suggest that expensive unsteady time-marching simulations can be avoided if interest is in the incipient shock-buffet dynamics, pertinent to future edge-of-the-envelope wing design.

Item Type: Conference or Workshop Item (Unspecified)
Depositing User: Symplectic Admin
Date Deposited: 14 Jan 2019 15:53
Last Modified: 19 Jan 2023 01:06
DOI: 10.2514/6.2019-0037
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3031257