Abstract
The concept of vortex is crucial in both understanding and modeling of turbulence. For large eddy simulation (LES), the effect of small-scale eddies onto the large scales or the resolved flow field is modeled by subgrid stress models. Even though the rotating motions of fluids, i.e., vortices or eddies are central in developing turbulent models, vortex identification methods are seldom used in these models. In this study, we develop a new subgrid model based on the Liutex vector, a new quantity introduced to decompose fluid motions into rigid rotation, pure shear and stretching, and thus identify vortices. The new model is then applied in a decaying homogeneous isotropic turbulence (DHIT) and a turbulent channel flow at Reynolds number Reτ = 180. It is shown that the new model can predict accurate energy spectra compared with experiments in DHIT and give a well-matched velocity profile in turbulent channel flow without changing the form of the model. Future directions include improvement of the Liutex based model, for example developing anisotropic subgrid models, and its applications in various turbulent flows.
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Conflict of Interest: The authors declare that they have no conflict of interest.
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Project supported by the National Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 22KJB130011), the Supercomputing Center in Yancheng (Grant No. FW(W)20221001).
Biography: Yuan Ding (1997-), Female, Master Candidate, E-mail: 1664242988@qq.com
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Ding, Y., Pang, By., Yan, Bw. et al. A Liutex-based subgrid stress model for large-eddy simulation. J Hydrodyn 34, 1145–1150 (2022). https://doi.org/10.1007/s42241-023-0085-0
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DOI: https://doi.org/10.1007/s42241-023-0085-0