Direct Numerical Simulation of Three-Dimensional Navier Stokes Equations for a Slit Nozzle Free Jet and Experimental Verification

概要

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The third-order upwind finite difference scheme is applied to the convective terms in three-dimensional Navier-Stokes equations to directly simulate the free jet flow emitted from a slit nozzle. The calculated flow field ranges from the nozzle exit to the fully developed turbulent region. The calculated results of turbulent characteristics (mean velocity distributions, turbulent intensity distributions, velocity autocorrelations and power spectra) are compared with the experimental data. The mesh size is roughly ten times the Kolmogorov microscale ; however, the calculated turbulent characteristics represent fairly well the experimental ones, except that the data are strongly dependent upon small-scale eddies. This means that the simulation documents well the motion of large-scale eddies which play an important role in the flow-field formation. Neglecting the small-scale eddies in the third-order upwind finite difference scheme does not greatly affect the calculated results of large-scale eddy motions.
一般社団法人日本機械学会の論文
1993-02-15