The objective of this paper is to investigate the fluidic thrust vectoring (FTV) effects of a secondary jet on the primary flow in a converging-diverging nozzle. The experiments are performed with a nozzle pressure ratio (NPR) of 4-10, a secondary pressure ratio (SPR) of 1 or 2, and two different secondary jet locations. Numerical simulations of the nozzle flow are carried out by solving the Navier-Stokes equation, and the input parameters are set to match the experimental conditions. Computations are performed with and without the secondary jet injection for different combinations of NPR, SPR, and jet location. The thrust pitching moment is also determined to evaluate the FTV performance. It is found that the thrust pitching moment increases with the SPR. The numerical results clearly indicate two FTV mechanisms induce thrust pitching moments with opposite signs.