Abstract
A synthetic turbulence generator is implemented in the DLR TAU-Code, to reduce the grey area that is typical for embedded LES approaches. The selected synthetic turbulence generator builds up a velocity field of fluctuations that reproduces the anisotropy and non-homogeneity of the boundary layer taken as reference from the RANS solution. In addition, the generator is significantly improved in order to reduce the numerical divergence of the generated velocity field and also to provide convective motion of the synthetic eddies. The implementation was tested in a flat plate boundary layer and verified against experimental data for the HGR-01 airfoil. The results show that the implementation shortens the transition distance to fully developed turbulence. The obtained flow profiles for the HGR-01 airfoil compare nicely to available PIV data.
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Acknowledgments
The authors gratefully thank the “Deutsche Forschungsgemeinschaft” (DFG) for funding this research within the DFG FOR1066 Research unit and the “NorddeutscheVerbundfür Hoch- und Höchstleistungsrechnen” (HLRN) for providing the computer resources that enabled the simulations presented here.
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Francois, D.G., Radespiel, R., Probst, A. (2015). Forced Synthetic Turbulence Approach to Stimulate Resolved Turbulence Generation in Embedded LES. In: Girimaji, S., Haase, W., Peng, SH., Schwamborn, D. (eds) Progress in Hybrid RANS-LES Modelling. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 130. Springer, Cham. https://doi.org/10.1007/978-3-319-15141-0_6
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DOI: https://doi.org/10.1007/978-3-319-15141-0_6
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