NUMERICAL SIMULATION OF STRATIFIED SUBMERGED JET

In this paper, stratified jet flows are investigated using the numerical simulation method. For a high accuracy of spatial discretization of the Navier-Stokes equations the method of spectral elements was chosen. By the method of direct numerical simulation (DNS) the solution algorithm was validated using the example of a turbulent flow in a periodic pipe with Reynolds number Re = 5 300, constructed using the average velocity and the diameter of the pipe. Comparison of statistical characteristics showed good agreement with the literature data. A further investigation was concentrated on a circular turbulent air jet flowing into a space filled with air, helium or carbon dioxide. For the air-to-air pair, the results are shown to be in good agreement with the literature data and other LES calculations. During the analysis of the helium-air and carbon dioxide-air pairs, their basic similarities and differences were revealed both with each other and with the air-air pair, it was suggested that the effects associated with stratification predominate over viscous effects.

Keywords:
turbulence, jet flow.  
УДК 532.517.4

NUMERICAL SIMULATION OF STRATIFIED SUBMERGED JET