Abstract
A large-eddy simulation based upon adding estimated, dynamically based backscatter terms to the Smagorinsky subgrid model is shown to be feasible. The model is based upon estimating the subgrid velocity from the high wavenumber aliasing residue of the resolved scale nonlinear terms and the interaction of this estimated velocity with the resolved scales. The objective is to model an intense event in a 2563 direct numerical simulation of decaying flow in a periodic box with random initial conditions before turbulence has developed. Rather than the second order dissipation or enstrophy, higher order norms of the velocity derivative field, the skewness, flatness and peak vorticity, are used to identify the intermittent event. Comparisons with a 2563 DNS truncated to 323 show that the Smagorinsky model does not capture this event, while the estimation model combined with the Smagorinsky model does. Enstrophy and dissipation around the intense event are also more realistic.
Keywords
- Direct Numerical Simulation
- Isotropic Turbulence
- Subgrid Scale
- Smagorinsky Model
- Dynamic Smagorinsky Model
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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© 1999 Springer Science+Business Media Dordrecht
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Kerr, R.M. (1999). Dynamic Estimation Tests of Decaying Isotropic Turbulence. In: Voke, P.R., Sandham, N.D., Kleiser, L. (eds) Direct and Large-Eddy Simulation III. ERCOFTAC Series, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9285-7_24
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DOI: https://doi.org/10.1007/978-94-015-9285-7_24
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-5327-5
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