Abstract
Direct and Large-eddy simulations (DNS/LES) were used to analyze the vortex dynamics and statistical behavior of bifurcating jets. The Reynolds numbers analyzed go from Re D 1.5 × 103 to Re D 5.0 × 104. The jet bifurcation was achieved by means of an active jet control superimposed to a spatially evolving round jet. Three types of forcing were analyzed, which reproduce the forcing methods used in experimental bifurcating jets [8], although using a much lower amplitude forcing, more realistic in terms of potential industrial applications. The study analyses coherent structures resulting from each of the forcing types and explains their impact in the statistical behavior of the bifurcating jets. Special emphasis is made in the influence of increasing Reynolds number in the spatial evolution of each excited jet. Finally, this work addressed also the dynamics of the near field coherent structures in a coaxial by means of DNS. The Reynolds number was Re D1 = 3000. The interaction between the inner and outer shear layers and its consequences for the transition process was analyzed in detail. In particular t is postulated that the inner streamwise vortex pairs are stretched by the central backflow region.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Akselvoll, K., and Moin, P. (1996), “Large-eddy simulation of turbulent confined coannular jets”, J. Fluid Mech., 315, pp. 387–411.
Crow, S. C., and Champagne, F. H. (1970), “Orderly structure in jet turbulence”, J. Fluid Mech., 48, pp. 547–591.
Rehab, H., Villermaux, E., and Hopfinger, J. (1997), “Flow regimes of largevelocity-ratio coaxial jets”, J. Fluid Mech., 345, pp. 345–281.
Gutmark, E., and Grinstein, F. (1999), “Flow control with noncircular jets”, Annu. Rev. Fluid Mech., 31, pp. 239–272.
Lesieur, M., and Métais, O. (1996), “New trends in large-eddy simulations of turbulence”, Annu. Rev. Fluid Mech., 28, pp. 45–82.
da Silva, C. B. (2001), “The role of coherent structures in the control and inter-scale interactions of round, plane and coaxial jets”, INPG, Grenoble.
Urbin, G., and Métais, 0. (1997), Large-eddy simulations of the three-dimensional spatially-developing round jets, in Direct and Large Eddy Simulation I I, Edited by Jean-Pierre Chollet, Peter R. Voke and Leonhard Kleiser, KLUWER ACADEMIC PUBLISHERS.
Lee, M., and Reynolds, W. C. (1985), “Bifurcating and blooming jets at high Reynolds number”, in 5th Symposium on turbulent shear flows.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2001 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
da Silva, C.B., Métais, O. (2001). Coherent Structures in Excited Spatially Evolving Round Jets. In: Geurts, B.J., Friedrich, R., Métais, O. (eds) Direct and Large-Eddy Simulation IV. ERCOFTAC Series, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1263-7_25
Download citation
DOI: https://doi.org/10.1007/978-94-017-1263-7_25
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-5893-5
Online ISBN: 978-94-017-1263-7
eBook Packages: Springer Book Archive