Numerical Simulation of Thermal Atmospheric Conditions in an Idealized Street Canyon: Comparison between RANS and LES
Keywords:
Idelized street canyon , Thermal atmospheric conditions , RANS , LESAbstract
This paper reports on the numerical comparison for the prediction of wind flow structure under thermal atmospheric conditions between a steady state Reynolds-averaged Navier-Stokes (RANS) model (the standard k-ε and a large eddy simulation (LES) technique with dynamic Smargorinsky-Lilly subgrid-scale (SGS) model against the previous experimental wind tunnel data.Two cases of thermal conditions are investigated, one for a different Fr number with leeward heated wall (isothermal, Fr=17.29, Fr=7.59) and another for a different location of heated wall (windward).The results of the numerical simulation indicate that the LES performs better than RANS by accurately predict the wind flow structure at different thermal intensites and different locations of heated wall.