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Simulation of the flow over the caarc standard tall building using different LES turbulence models

Lygidakis Georgios, Sarakinos Sotirios, Nikolos Ioannis

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Summary

The simulation of unsteady turbulent flows remains a significant problem in CFD despite the tremendous advances in the performance of supercomputers during the past decades. Considering this state, the enhancement of the in-house academic CFD solver Galatea-I with the LES approach is reported in this study. LES is actually a compromise between the RANS and DNS methods, entailing though increased accuracy, comparing to the first one, and less computational load than the second. Particularly, four Sub-Grid Scale models have been incorporated, namely, the Smagorinsky, the WALE, the dynamic Germano-Lilly and the dynamic kinetic energy one. They were validated against a real 3D problem, concerning turbulent flow over the CAARC standard tall building model, a specially designed geometry for wind tunnel experiments on tall buildings. Independently of the implemented modelling approach, the extracted results appear to be close with the available experimental and numerically computed data, confirming the potential of Galatea-I to encounter such simulations. The last two models are revealed to be the most accurate ones, a conclusion actually expected due to their more sophisticated formulation. An additional simulation was performed with the RANS approach and the SST model, which confirmed the superiority of the LES methodology in terms of accuracy.

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