Abstract
Subgrid-scale (SGS) models based on relaxation regularization are investigated for incompressible transitional and turbulent channel flow using a spectral method. The main focus is on a simple model formalism which can be used on very coarse LES grids. During the initial phase of transition, the models remain inactive as long as the flow is still well resolved on the coarse LES grid. During the late stages of transition and the following fully-turbulent phase the models provide necessary SGS dissipation. The connection of aliasing errors and SGS modelling is examined. Of particular importance is that SGS models based on relaxation regularization reduce the effects of aliasing errors, allowing to perform numerical simulations even without dealiasing and thus lowering the computational time significantly. Furthermore, the performance of the models is evaluated for different dynamic and non-dynamic model coefficients all showing good agreement with fully-resolved DNS.
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Schlatter, P., Stolz, S., Kleiser, L. (2004). Relaxation-Term Models for LES of Transitional/Turbulent Flows and the Effect of Aliasing Errors. In: Friedrich, R., Geurts, B.J., Métais, O. (eds) Direct and Large-Eddy Simulation V. ERCOFTAC Series, vol 9. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-2313-2_8
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DOI: https://doi.org/10.1007/978-1-4020-2313-2_8
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