Assessment of subgrid-scale modeling for large-eddy simulation of a spatially-evolving compressible turbulent boundary layer. (27th June 2017)

• Record Type: Journal Article
• Authors: Ben-Nasr, O.; Hadjadj, A.; Chaudhuri, A.; Shadloo, M.S.
• Is Part Of: Computers & fluids. Volume 151(2017)
• Page Start: 144
• Page End: 158
• Publication Date: 2017-06-27
• Subjects: Subgrid-scale (SGS) modeling -- supersonic turbulent boundary layer (STBL) -- Large-Eddy simulation (LES) -- Wall-adapting local eddy-viscosity (WALE) -- Dynamic smagorinsky model (DSM) -- Coherent structures model (CSM); Fluid dynamics -- Data processing -- Periodicals; 532.050285
• DOI: 10.1016/j.compfluid.2016.07.004
• Languages: English
• ISSNs: 0045-7930

Abstract

Highlights: Assessment of the prediction quality of three popular SGS models. Near-wall asymptotic behaviour for supersonic turbulent boundary layer. Analysis of SGS dissipation, numerical scheme and mesh resolution. Abstract: The performance of three standard subgrid-scale (SGS) models, namely the wall-adapting local eddy-viscosity (WALE) model, the Dynamic Smagorinsky model (DSM) and the Coherent Structures model (CSM), are investigated in the case of a spatially-evolving supersonic turbulent boundary layer (STBL) over a flat plate at M ∞ = 2 and Re θ ≈ 2600. A high-order split-centered scheme is used to discretize the convective fluxes of the Navier–Stokes equations, and is found to be highly effective to overcome the dissipative character of the standard shock-capturing WENO scheme. The consistency and the accuracy of the simulations are evaluated using direct numerical simulations taken from the literature. It is demonstrated that all SGS models require a comparable minimum grid refinement in order to capture accurately the near-wall turbulence. Overall, the models exhibit correct behavior when predicting the dynamic properties, but show different performances for the temperature distribution in the near-wall region even for cases with satisfactory energy resolution of more than 80%. For a well-resolved LES, the SGS dissipation due to the fluctuating velocity gradients is found to dominate the total SGS dissipation.