Wind loads dominate the design of tall and slender structures such as cooling towers. Flow around the curved bodies like cooling towers are strongly depends on Reynolds number. In the present study, the analytic method needed to simulate the Reynolds effect in wind tunnel is briefly discussed. Based on the proposed method, the external flow around the cooling towers with Reynolds correction is simulated to achieve a Re 108 flow effect in Re 105 flow condition. The effectiveness of the proposed approach to measure the external pressure coefficient (image ) of 200m cooling tower model is addressed. Based on the wind tunnel experiments with Reynolds correction, a revised pressure coefficient distribution for super large cooling towers is proposed. Further, cooling towers constructed in multi rows with close proximity to each other is becoming common in the recent past, a development that is having profound impact on interference. Wind direction and spacing of cooling towers have an important influence on interference when compared to the arrangement of cooling towers. Hence in the present study, systematic wind tunnel testing on several combinations of various spacing/diameter ratios of the representative four tower arrangement of cooling tower models are attempted for various wind directions viz. 0° to 180° under boundary layer flow condition for the interference function of cooling towers. Further from the analysis, a closed form solution is arrived for the interference of multi-row towers.