Study on the influence of voids on high-rise building on the wind environment

Li, Yangluxi; Chen, Lei

The advanced turbulence model such as LES and DES could indeed predict wind flow field more accurately than k-ε turbulence model for outdoor environment. However, the above two turbulence models require more accurate parameter settings such as sub-grid configuration and much more computational time than RANS CFD method. For LES, it has been proved to be superior than RANS model because of its high precision especially in terms of gustiness. For DES, it can also produce similar exact results with LES. Nevertheless, LES model needs high requirement for hardware and computational time (Shen et al. 2017; He and Song 1999) . Moreover, DES requires higher mesh resolution and parameters (Liu et al. 2017a) . In this study, the research condition cannot meet the requirement of the two above turbulence models. Therefore, this study implemented the RANS turbulence modelling method to perform the simulation. The RNG k-ε model could improves the accuracy compared to standard k-ε model and takes lower computed time and computer resources (Mittal et al. 2018) . The final results also have a good agreement with the wind tunnel measurement consequences.