Fast Algorithm Development for Large-Eddy Simulation of Circular-Jet Turbulence

摘要

The research addresses a single, free, round turbulent jet expanding into a quiescent environment, and deals with the large scale motions through large eddy simulation and the small scale motions through subgrid-scale turbulence modeling. The computational fluid dynamic investigation of the nearfield downstream of an axisymmetric nozzle is based on a two dimensional procedure involving a variable reduction method, with the farfield fully developed flow structure analyzed by matched asymptotic expansions for large Reynolds numbers. The numerical algorithm development examines vectorization, three dimensional flowfield, and the construction of weakly dissipative difference methods.