A Numerical Study of Temporal Mixing Layer with Three-Dimensional Mortar Spectral Element Method

We investigate a set of well-posed interface conditions of viscous fluxes of Navier–Stokes equations, extend them to three-dimensional Navier–Stokes equations and successfully study a temporally turbulent mixing layer. The evolution of a large vortex structure and the non-dimensional statistical quantities in the mixing layer are numerically analyzed. The span-wise energy spectrum of the mixing layer exhibits wide band features, which means that the simulation generates the desired amount of small scales. These results show that too many small scales are present due to insufficient dissipation and the amount of large scales is low, indicating too much dissipation for large-scale structures.