Modeling of Turbulent Mixing Layer Dynamics in Ultra-High Pressure Flows

Abstract

*† ‡ § The dynamics of air/nitrogen mixing layers under high pressure are studied using a computational approach, which embodies real gas equations of state, an advanced flux formulation for accurate unsteady solutions and detached eddy simulations (DES) of the turbulent dynamics. Real-fluid properties are obtained through efficient interpolation of adaptive property tables. Advanced preconditioned flux formulations are employed to reduce the inherent artificial dissipation in second-order finite-volume schemes. The DES method is employed within a ω − k turbulence model. The effectiveness of our computational approach is demonstrated using an exact solution for Taylor vortices and by computing decay of isotropic turbulence in a box. The paper focuses on the dynamics of air-nitrogen mixing layers for various Reynolds numbers and momentum thicknesses under high pressures. Both 2D and 3D DES simulations are obtained and the results are compared with 2D unsteady-RANS simulations to highlight the differences.