However air current is the major cause of flow inside the wind catcher networks, but the effect of wind direction changes on the performance of different types of wind catchers is unknown yet. Therefore, during this study an attempt was made to create desirable conditions for comparing single-pressure and multiple-pressure types of wind catchers in order to discover the effect of wind direction changes on the performance of each type of wind catchers. The CFD model of both types were created which were exposed to wind blowing at the speed of 3 m/s and at the angles of 0, 45, 90, 135, and 180 degree. The obtained results indicated that the type of high-pressure area against the cage inflow determined the direction of wind inside their networks. During every blow towards the single-pressure type only one flow was generated whereas in multi-pressure type both downward and upward flows were generated. Moreover, while in the single-pressure types only the high-pressure area in front of the inflow was been used, in the multiple-pressuretype the entire high-pressure area around the cage was been practically in used.
