This study aims to numerically simulate the hydrodynamic behavior of segments of circular cross section pipelines subjected to the constant current of perpendicular direction to its axes. On the computer, calculations provide the motions and coefficients of drag and lift force of the pipelines. The results are compared with other experiments for validation. From the comparisons, it is concluded that the results for an isolated cylinder have good agreement with results in the literature, which is not verified for the result with two cylinders in tandem position.