The heller type dry cooling tower performance is significantly affected by unfavorable wind effects. During recent years, many modifications including the application of new equipment, using new materials, modification of tower's geometry, etc., have been proposed to optimize heller cooling towers performance. In this study, a crown supplement is proposed to reduce the throttling effect of deflected plume. Two alternatives of the elastic ring with 5% and 10% of the cooling tower height are considered. In order to investigate the effect of proposed crown supplement computational modeling is used utilizing ANSYS commercial software. For this purpose, a numerical model was utilized and the results were verified by comparing pressure at trunk of towers with VGB code. The thermal buoyancy phenomenon helps airflow to move upward. Assuming that thermal buoyancy will help to the results, in present work this phenomenon is not considered. The computational results present better performance by increasing 9 to 12.6 percent of air volume flow through the tower compared to the usual condition.