3D AND 2D NUMERICAL SIMULATION OF TURBULENT MIXING IN THE NOVA LASER FACILITY EXPERIMENT WITH A FLAT TARGET
V. P. Statsenko, Yu. V. Yanilkin, O. G. Sinkova, Yu. V. Tretyachenko
VANT. Ser.: Mat. Mod. Fiz. Proc 2021. Вып.3. С. 21-33.
In the simulation of experiments on laser facilities there occurs the need in simulating the turbulent mixing process. One of the commonly-accepted models of turbulence is the semiempirical (κ, ε)-model. There is a need in applying and testing this model under high-energy and high-temperature conditions. The paper presents results of 2D simulations with the EGAK code using the (κ, ε)-model of turbulence for various experiments with a flat-plate target on the NOVA laser facility (USA). These results are compared with experimental data on testing phenomenological models of turbulence used to solve the high energy density problem. Also, computations with the 3D and 2D direct numerical simulation method were carried out. There is a good agreement between these results, as well as results of computations with the (κ, ε)-model. Results of computations with regard to the initial disturbances of a contact boundary specified in experiments are in a good agreement with experimental data and the approximate analytical solution to the problem also found in this work.Keywords: the EGAK code, turbulent mixing, laser experiment, flat target, X-ray radiography, numerical simulation, analytical solution.
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