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Problems of the conventional BL model as applied to super/hypersonic turbulent boundary layers and its improvements

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Abstract

Turbulence modeling has played important roles in solving engineering problems. However, with the development of aerospace technology, turbulence modeling faces new challenges. How to further improve turbulence modeling for super/hypersonic flows is an urgent problem. Through analyzing a set of data resulting from DNS and experiments, it is found that some most popular models suffer from essential flaws, and can be hardly improved following the traditional mode of thinking. On the contrary, the BL model, which is one of the simplest and widely-used models, can be further improved. In this paper, through analyzing results from DNS data, the main cause of the inaccuracy in applying the BL model to supersonic and hypersonic turbulent boundary layers is found to have resulted from the mismatch between the location of the matching point of the inner and outer layers of the BL model determined by the conventional way and those given by DNS. Improvement on this point, as well as other improvements is proposed. Its effectiveness is verified through the comparison with DNS results.

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Correspondence to Ming Dong.

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Dong, M., Li, X. Problems of the conventional BL model as applied to super/hypersonic turbulent boundary layers and its improvements. Sci. China Phys. Mech. Astron. 54, 1889 (2011). https://doi.org/10.1007/s11433-011-4450-6

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