Application of compact finite-difference methods to numerical simulation of a non-isothermal turbulent jet

摘要

A series of direct numerical simulations (DNS) and large eddy simulations (LES) of a temporally evolving non-isothermal round jet has been performed. The algorithm uses sixth-order compact finite differencing which is found to he a good alternative to spectral methods when the boundaries are not periodic. DNS of a low compressible (M = 0.2) and moderately compressible (M = 1) heated round jet has been conducted at a low Reynolds number. Compressibility effects on the growth of instabilities during the transitional regime have been examined. Furthermore, the LES approach used at a higher Reynolds number permitted to recover the self-similarity of the turbulent jet flow.