Use of hydrodynamic stability approach for the calculations of inflow boundary conditions and spread of an axisymmetric turbulent jet

The purpose of this study is to generate proper and sufficiently accurate inflow boundary conditions for turbulent jet simulations using the LES method with the help of hydrodynamic stability approach. This goal is achieved in two stages: In the first stage, the hydrodynamic stability of a circular pipe flow was analyzed by deriving linearized equations of motion for fluctuation components, which were solved by the parallel shooting method to obtain Fourier modes. In the second stage, by using these modes, instantaneous velocity profiles with correct space-time correlations were generated, which were then applied as an inflow boundary condition in several LES simulations of an incompressible, axisymmetric turbulent air jet. Finally, results were compared with the experimental data.