Numerical Investigation of Circular Turbulent Jets in Shallow Water
Publication: Journal of Hydraulic Engineering
Volume 143, Issue 9
Abstract
Knowledge of turbulent jets in shallow water depths is of utmost importance to adequately characterize municipal and industrial discharges. Propagation and dilution of such discharges are influenced by the presence of channel bed and water surface at close proximity. This study numerically investigates the bed/water surface confinement effects on circular turbulent jets by analyzing key parameters such as decay of maximum velocity, velocity profiles, growth of jet, locus of maximum velocity, and turbulence properties. Results reveal that the confinement has a profound impact on the entrainment and mixing characteristics of a jet. Entrainment is suppressed at the confining surface, and as a consequence velocity decays at a lower rate. The locus of maximum velocity shifts toward the closest confining surface for asymmetrical cases, whereas it shifts toward the bed for symmetrical cases. Mixing of a jet both in the horizontal and the vertical planes is affected significantly by the confinement. Turbulence characteristics differ significantly in the vertical plane only. Findings from this study will be useful for characterizing properties of circular jets discharging in a confined ambient conditions.
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References
Albertson, M. L., Dai, Y. B., Jensen, R. A., and Rouse, H. (1950). “Diffusion of submerged jets.” Trans. Am. Soc. Civil Eng., 115(1), 639–664.
ANSYS Fluent version 15.0 [Computer software]. ANSYS, Canonsburg, PA.
Aziz, T., Raiford, J., and Khan, A.-A. (2008). “Numerical simulation of turbulent jets.” Eng. Appl. Comput. Fluid Dyn., 2(2), 234–243.
Ball, C. G., Fellouah, H., and Pollard, A. (2012). “The flow field in turbulent round free jets.” Prog. Aerosp. Sci., 50, 1–26.
Bhuiyan, F., Habibzadeh, A., Rajaratnam, N., and Zhu, D. Z. (2011). “Reattached turbulent submerged offset jets on rough beds with shallow tailwater.” J. Hydraul. Eng., 1636–1648.
Coates, A. D. (1976). “The numerical and experimental studies on the dynamics of fluids.” Ph.D. thesis, Heriot-Watt Univ., Edinburgh, U.K.
Dracos, T., Giger, M., and Jirka, G. H. (1992). “Plane turbulent jets in a bounded fluid layer.” J. Fluid Mech., 241(1), 587–614.
Ead, S. A., and Rajaratnam, N. (2002). “Plane turbulent wall jets in shallow tailwater.” J. Eng. Mech., 143–155.
Faghani, E., Saemi, S. D., Maddahian, R., and Farhanieh, B. (2011). “On the effect of inflow conditions in simulation of a turbulent round jet.” Arch. Appl. Mech., 81(10), 1439–1453.
Foss, John F., and Jones, J. B. (1968). “Secondary flow effects in a bounded rectangular jet.” J. Basic Eng., 90(2), 241–248.
Frick, W. E., Roberts, P. J. W., Davis, L. R., Keyes, J., Baumgartner, D. J., and George, K. P. (2000). Dilution models for effluent discharges—Visual plumes, 4th Ed., U.S. Environmental Protection Agency, Environmental Research Division, NERL, Standards and Applied Science Division, Office of Science and Technology, Athens, GA.
Ghahremanian, S., and Moshfegh, B. (2014). “Evaluation of RANS models in predicting low Reynolds, free, turbulent round jet.” J. Fluids Eng., 136(1), 011201.
Giger, M., Dracos, T., and Jirka, G. H. (1991). “Entrainment and mixing in plane turbulent jets in shallow water.” J. Hydraul. Res., 29(5), 615–642.
Hinze, J. O., and Zijnen, B. V. D. H. (1949). “Transfer of heart and matter in the turbulent mixing zone of an axially symmetrical jet.” Appl. Sci. Res., 1(1), 435–461.
Hussein, H. J., Capp, S. P., and George, W. K. (1994). “Velocity measurements in a high-Reynolds-number, momentum-conserving, axisymmetric, turbulent jet.” J. Fluid Mech., 258(1), 31–75.
Islam, M. R., and Zhu, D. Z. (2011). “A numerical study of confined wall jets in a shallow basin.” J. Hydraul. Res., 49(5), 595–600.
Johnston, A. J. (1985). “Aspects of buoyant and non-buoyant jets entering shallow tailwaters.” Preprinted Proc.: 21st Congress, International Association for Hydraulic Research, Netherlands, 149–155.
Johnston, A. J., and Halliwell, A. R. (1986). “Jet behaviour in shallow receiving water.” ICE Proc., 81(4), 549–568.
Lemanov, V. V., Terekhov, V. I., Sharov, K. A., and Shumeiko, A. A. (2013). “An experimental study of submerged jets at low Reynolds numbers.” Tech. Phys. Lett., 39(5), 421–423.
Mistry, D., and Dawson, J. R. (2014). “Experimental investigation of entrainment processes of a turbulent jet.” 19th Australasian Fluid Mechanics Conf., Australasian Fluid Mechanics Society, Melbourne, Australia, 59.
Nash, J. E., and Sutcliffe, J. V. (1970). “River flow forecasting through conceptual models. I: A discussion of principles.” J. Hydrol., 10(3), 282–290.
Pope, S. B. (1978). “An explanation of the turbulent round-jet/plane-jet anomaly.” AIAA J., 16(3), 279–281.
Raiford, J. P., and Khan, A. A. (2009). “Investigation of circular jets in shallow water.” J. Hydraul. Res., 47(5), 611–618.
Rajaratnam, N., and Khan, A. A. (1992). “Intersecting circular turbulent jets.” J. Hydraul. Res., 30(3), 373–387.
Shinneeb, A. M., Balachandar, R., and Bugg, J. D. (2011). “Confinement effects in shallow-water jets.” J. Hydraul. Eng., 300–314.
Wygnanski, I., and Fiedler, H. (1969). “Some measurements in the self-preserving jet.” J. Fluid Mech., 38(3), 577–612.
Xu, G., and Antonia, R. (2002). “Effect of different initial conditions on a turbulent round free jet.” Exp. Fluids, 33(5), 677–683.
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Published In
Journal of Hydraulic Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Sep 23, 2016
Accepted: Feb 8, 2017
Published online: May 13, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 13, 2017
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