Analysis and extension of the quadratic constitutive relation for RANS methods
The Aeronautical Journal
Cambridge University Press
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Sabnis, K., Spalart, P., Galbraith, D., Babinsky, H., & Benek, J. Analysis and extension of the quadratic constitutive relation for RANS methods. The Aeronautical Journal https://doi.org/10.17863/CAM.68593
The quadratic constitutive relation was proposed as an extension of minimal complexity to linear eddy-viscosity models in order to improve mean flow predictions by better estimating turbulent stress distributions. However, the successes of this modification have been relatively modest and are limited to improved calculations of flow along streamwise corners, which are influenced by weak secondary vortices. This paper revisits the quadratic constitutive relation in an attempt to explain its capabilities and deficiencies. The success in streamwise corner flows cannot be entirely explained by significant improvements in turbulent stress estimates in general, but is instead due to better prediction of the particular turbulent stress combinations which appear in the mean streamwise vorticity equation. As a consequence of this investigation, a new formulation of turbulent stress modification is proposed, which appears to better predict the turbulent stress distributions for a variety of flows: channel flow, equilibrium boundary layers, pipe flow, separated boundary layers, and square duct flow.
This material is based upon work supported by the US Air Force O ce of Scientific Research under award FA9550–16–1–0430.
European Office of Aerospace Research and Development (EOARD) (FA8655-11-1-3002)
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This record's DOI: https://doi.org/10.17863/CAM.68593
This record's URL: https://www.repository.cam.ac.uk/handle/1810/321473
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