Numerical Assessment of the Pulse Crossing Jet in Nozzle Fluidic Thrust Vectoring Using Unsteady Reynolds-Averaged Navier–Stokes Turbulence Approach

In the present study, a software has been developed using the unsteady Reynolds-averaged Navier–Stokes method to simulate time variation of turbulence coherent structure and reduce computational cost and it is used for numerical simulation of a jet in the cross nozzle flow, accurate determination of the flow structure and nozzle fluidic thrust vectoring. Since this software can capture time dependent physics, in this paper, its capability has been investigated in the simulation of pulse jet in nozzle cross flow and variation of the fluidic thrust vectoring for three frequencies, 50, 100, and 200 Hz. Firstly, software validation has been performed by comparison the results with some experimental data, next, variation of jet in cross flow and its effect on the exhaust flow field and nozzle surface pressure distribution have been studied. Governing equation on the unsteady Reynolds-averaged Navier–Stokes algorithm has been explained and time step and applied boundary conditions have been presented. The Finite volume approach has been used for numerical discretization and the advection upstream splitting method has been utilized for flux computing. Also, to improve the solution accuracy, the multi-block grid and 2nd order monotonic upwind scheme for conservation laws method have been applied and to reduce computational time, the open multi-processing parallel approach has been used.