Large-Eddy Simulations (LES) play a key role in the understanding of complex fluid flow problems as they provide an accurate numerical representation of the spatial and temporal development of turbulent flows at a reduced computational cost. This video presents a new approach to LES, termed Coherent-vorticity Preserving (CvP), designed to leave the large-scale, coherent motion of the flow unaffected by turbulence models, which are applied only to regions of small-scale vorticity. This new approach is showcased in simulations of a knotted vortex — a fundamental model problem for the study of vortex filaments reconnection and bursting. The comparison of the present CvP-LES approach with previous experiments demonstrates the potential of the method to capture accurately complex flow problems using coarse resolutions.
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