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Numerical simulations of turbulent round jets, using explicit-filtered LEStechnique, are performed, for three different Reynolds numbers(Re = 3600,88000, 4), to understand the Reynolds number effect on subsonic jets withMach number 0.9. Eigth-order compact schemes are used for spatial derivativeestimation. Second order Runge-Kutta method is used for Time evolution of flow.One-parameter fourth-order compact filter is used for low-pass explicitfiltering of transported variables. Decreased centreline axial velocity decayrate and reduced turbulence intensities are observed as jet Reynolds numberincreases. Jet spread-rate is observed to be independent of the Reynoldsnumber. An early potential-core collapse and transition to turbulent regime isobserved in jets with high Reynolds number, for same inflow turbulence seeding.Role of increased smaller length scales with increase in Reynolds number isanalyzed. It is observed that behavior of turbulent round jets is similar tothat of plane jets, irrespective of gain in dimensional freedom. Detaileddiscussions of the observations made from numerical experiments are presented.

Reynolds number effects on transition, turbulence intensity and axial-velocity decay rate of turbulent round jets