The studying of sloshing is very important because it has widespread applications in many industries such as automotive, ship building, and aerospace. The load experienced by the tank because of sloshing causes great structural stresses that may lead to a great damage. Sloshing occurs in all types of vehicles that undergo sudden accelerated or decelerated motion. The effect of baffle types and its number in reducing sloshing effect is investigated in this study. The study includes CFD simulation using ANSYS fluent on two types of baffles: ring and alternating at deferent tank levels. The volume of fluid (VOF) method was used to track the free surface of sloshing in a circular-cylindrical storage tank (tanker) due to sudden changes in braking. The study shows that the more the number of baffles the lower the force on the tank walls except some cases. The study also shows that ring baffles are preferred in some cases and in other ones alternating baffles are preferred.