NUMERICAL SIMULATION OF TURBULENT FLOWS IN MIXING GAS-DYNAMIC LASERS

Yu. N. Bulkin, B.A. Vyskubenko, Yu. N. Deryugin, Yu.V. Kolobyanin, E. A. Kudryashov, L. N. Shakhova
VANT. Ser. Mat. Mod. Fiz. Proc 1991. Вып.1. С. 17-22.

      The paper describes the techniques and results of the numerical simulation of turbulent mixing processes for supersonic flows in channels of mixing gas-dynamic lasers. Turbulent flows of a non-equilibrium gas mixture are described by the parabolic Navier-Stokes equations and kinetic vibrational relaxation equations. Both algebraic and differential models of turbulence are used to find the turbulent viscosity value. The equation system is numerically integrated with the McCormack finite-difference method using a Lagrangian grid. For various models of turbulence, the dependence of the calculated results on the difference grid in use and model parameters is analyzed. The calculated results and experimental values of the magnification coefficient and energy sampling are compared.