CFD (Computational Fluid Dynamics) simulation is the main research method for assessing the wind environment around building complexes. In this paper, a comparison of different turbulence models in simulating wind environment around building complexes is conducted to discuss their precision of simulation. Present work used a three dimensional scale down model of buildings where steady flow analysis has been done. It has been implemented through ANSYS Fluent 17.0 using SIMPLE algorithm as solver. The turbulence models used as the RANS based model: the standard k-epsilon model, RNG k-epsilon model and Realizable k- ɛ model. Firstly, the CFD simulation results for single high rise building showed good agreement of approximately 99% in Cp compared to the experimental results obtained from Tokyo Polytechnic University "New frontier of Education and Research in Wind Engineering". Secondly, the CFD simulation results for the surrounding effect of building are investigated. The effects of the surroundings significantly reduce the surface pressure coefficients. Thirdly, For the existing cluster of building in Mandalay, Wind pressure coefficients are compared with the three different turbulence models in Fluent. The Standard k-ɛ model and Realizable k-ɛ model appear to produce exactly prediction wake recirculation zone. The RNG k-ɛ model greatly over predicts the size of the recirculation zone and a strong wake flow among buildings. The standard k-ε, RNG k-ε, realizable k-ε models produce similarly shaped contour map of pressure but with significant differences in magnitude.
Thet Mon Soe, San Yu Khaing (2017); Comparison of Turbulence Models for Computational Fluid Dynamics Simulation of Wind Flow on Cluster of Buildings in Mandalay;
Int J Sci Res Publ 7(8) (ISSN: 2250-3153). http://www.ijsrp.org/research-paper-0817.php?rp=P686711