A large amount of the consumed steel is produced by the casting process, and thus extensive research has been conducted on this process. One of the most important means of continuous casting is tundish. In order to increase the quality of molten alloy and segregate the impurities from it, a special consideration is needed to be put on the tundish. Tundish is used to make the molten flow from the furnace steady and add a residence time to it. Some methods are being used to control the residence time in the tundish so that the impurities have sufficient time to move to the upper surface of the molten steel. One of the most common methods is the usage of geometric barriers inside of tundish. Using these barriers elevates the flow and helps the impurities to segregate and the residence time to increase. Nevertheless, in addition to the residence time distribution, the flow pattern is very important too due to its effect on slag. Unlike other studies, the current study has focused on this issue. Tundish is studied using experimental and numeral methods. In the present study, numeral simulation of tundish is performed using ANSYS CFX software. Different geometric analysis and different tools are used to analyze flow pattern and residence time in order to determine the optimum states. Optimum states are then derived in accordance with the results at hand. In some geometric designs, it has been observed that although having a suitable mean residence time, the flow pattern is not appropriate and this can affect the slag flow negatively. In the geometric designs with baffle, the bore quantity and their positions have a great impact on the flow and the mean residence time and the optimum results are reached when the quantity is high and the position is far from the entrance. For geometries with baffle and weir, the results for different states were inappropriate. For geometries with a dam, the optimum conditions and suitable reforms were obtained. In addition, suggestions for equipment modification and tundish performance are also presented. Keywords : tundish, continuous casting, flow control equipment, residence time distribution, inclusion removal