Abstract
Experiments and computational studies were made on a slender body having a slender ratio of 16 at a freestream velocity of and Reynolds number of based on the base diameter so as to obtain the details of the flowfield that leads to the generation of side force at large angles of attack. It is observed that the large side force experienced at a high angle of attack of 50 deg is due to the presence of asymmetric vortices, which change its direction in the downstream. The vortices lift off from the surface due to the adverse pressure gradient. The major contribution of side force is mainly from an initial length limited to six times the base diameter, suggesting that efforts to reduce the side force by introducing any control method would be effective if used in the initial part of the body. Use of a circular trip having 5% height of the base diameter placed at a distance of 3.5 times the base diameter modifies the initial vortices and hence the local side force distribution over the body, which is mainly responsible for substantial reduction in the side force.
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