Adaptation for Scale-Resolved Turbulence
Résumé
The need for reliable industrial CFD simulations has accelerated the quest for robust methods for scale-resolving simulations of turbulent flows. In the presence of massive separation and shock interaction, Reynolds-Averaged Navier-Stokes (RANS) modeling alone is unlikely to produce good results. The use of Large Eddy Simulation (LES) models or combinations with RANS offers good prospects for overcoming this obstacle.
Due to the complexity of such flows, adaptive techniques such as h- or p-adaptivity play a major role. Substantial progress has been achieved in mesh adaptation for RANS, involving adjoints or feature-based sensors to drive the adaptivity. For scale-resolving turbulence, such adaptive techniques offer great potential but have not yet seen widespread use due to complex geometries, inadequate error estimation (either in h- or p- or h-p coupling techniques), high sensitivity of hybrid models to mesh sizes, etc.
To stimulate research in this emerging topic, the International Journal of Computational Fluid Dynamics (IJCFD) published a Special Issue on Adaptation for Scale-resolved Turbulence, to capture the challenges, highlight recent progress, prompt discussions on open questions, and become a springboard for future developments regarding automatic adaptation methods for LES and hybrid RANS/LES simulations of complex turbulent flows.
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