TY - JOUR
T1 - Vortex-ring dynamics in a transitional subsonic free jet. A numerical study
AU - Grinstein, F. F.
AU - Hussain, F.
AU - Oran, E. S.
PY - 1990
Y1 - 1990
N2 - The spatial evolution of a high Reynolds number, axisymmetric, laminar free jet is computed numerically with a compressible, fourth-order phase-accurate, finite-difference Flux-Corrected Transport algorithm and appropriate inflow and open-boundary conditions. The effects of initial conditions, Mach number and controlled axial excitation on the physics of large-scale, two-dimensional, organized structures in the transitional region of the jet are investigated. The results show the detailed connection between the formation and interaction of coherent structures and streamwise momentum flux increases associated with pressure drops and transverse velocity fluctuations in the shear layer. More pronounced momentum flux increases are found for lower Mach numbers, for larger ratios of jet-diameter to initial-shear-layer-thickness, and when the shear-layer organization is enhanced by controlled excitation of the shear-layer mode.
AB - The spatial evolution of a high Reynolds number, axisymmetric, laminar free jet is computed numerically with a compressible, fourth-order phase-accurate, finite-difference Flux-Corrected Transport algorithm and appropriate inflow and open-boundary conditions. The effects of initial conditions, Mach number and controlled axial excitation on the physics of large-scale, two-dimensional, organized structures in the transitional region of the jet are investigated. The results show the detailed connection between the formation and interaction of coherent structures and streamwise momentum flux increases associated with pressure drops and transverse velocity fluctuations in the shear layer. More pronounced momentum flux increases are found for lower Mach numbers, for larger ratios of jet-diameter to initial-shear-layer-thickness, and when the shear-layer organization is enhanced by controlled excitation of the shear-layer mode.
UR - http://www.scopus.com/inward/record.url?scp=0025624008&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0025624008
SN - 0997-7546
VL - 9
SP - 499
EP - 525
JO - European Journal of Mechanics, B/Fluids
JF - European Journal of Mechanics, B/Fluids
IS - 6
ER -