In this research, the phenomenon of vortex-induced vibrations and the effect of control cylinders usage with different configurations on vortex formation, lift and drag coefficients, and fluctuations amplitude at the back of an elastically supported rigid circular cylinder subjected to a uniform fluid flow are studied. Results obtained in the absence of control cylinders are validated with experimental and numerical results of other researchers and a good conformity is reached. After ensuring simulation accuracy and precision, control cylinders of equal diameter with master cylinder are placed as linear and triangular arrangements at the back of master cylinder and the optimal configuration and location of control cylinders are defined. In linear arrangement, at first the effect of a control cylinder usage at 5 different distances from 1.5 to 3.5 times diameter of master cylinder and then two control cylinders with ratios of 1.5, 2 and 2.5 times diameter of master cylinder are studied. At the end, in triangular arrangement, control cylinders are located at intervals of 1, 1.5 and 2 times diameter of master cylinder.