Browse > Article
http://dx.doi.org/10.12652/Ksce.2014.34.5.1435

Analysis of Coherent Structure of Turbulent Flows in the Rectangular Open-Channel Using LES  

Ban, Chaewoong (Yonsei University)
Choi, Sung-Uk (Yonsei University)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.34, no.5, 2014 , pp. 1435-1442 More about this Journal
Abstract
This study presented numerical simulations of smooth-bed flows in the rectangular open-channel using the source code by OpenFOAM. For the analysis of the turbulent flow, Large Eddy Simulations were carried out and the dynamic sub-grid scale model proposed by Germano et al. (1991) is used to model the residual stress term. In order to analyze the coherent structure, the uw quadrant method proposed by Lu and Willmarth (1973) is used and the contribution rate and the fraction time of the instantaneous Reynolds stress are obtained in the Reynolds stress. The results by the present study are analyzed and compared with data from previous laboratory studies and direct numerical simulations. It is found that the contribution rate of the ejection events is larger than that of sweep events over the buffer layer in the open-channel flow over the smooth bed, however, the frequency of the sweep event is higher than that of the ejection events.
Keywords
Turbulence; Coherent structure; Bursting phenomena; uw quadrant threshold; Large eddy simulation; OpenFOAM;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Kim, H. T., Kline, S. J. and Reynolds, W. C. (1971). "The production of turbulence near a smooth wall in a turbulent boundary layer." Journal of Fluid Mechanics, Vol. 50, No. 1, pp. 133-160.   DOI
2 Kim, J., Moin, P. and Moser, R. (1987). "Turbulence statistics in fully developed channel flow at low Reynolds number." Journal of Fluid Mechanics, 177, pp. 133-166.   DOI   ScienceOn
3 Kline, S. J., Reynolds, W. C., Schraub, F. A. and Runstadler, P. W. (1967). "The structure of turbulent boundary layers." Journal of Fluid Mechanics, Vol. 30, No. 4, pp. 741-773.   DOI
4 Lilly, D. K. (1992). "A proposed modification of the Germano subgrid-scale closure method." Physics of Fluids A: Fluid Dynamics (1989-1993), Vol. 4, No. 3, pp. 633-635.   DOI
5 Lu, S. S. and Willmarth, W. W. (1973). "Measurements of the structure of the Reynolds stress in a turbulent boundary layer." Journal of Fluid Mechanics, Vol. 60, No. 3, pp. 481-511.   DOI
6 Nakagawa, H. and Nezu, I. (1977). "Prediction of the contributions to the Reynolds stress from bursting events in open-channel flows." Journal of Fluid Mechanics, Vol. 80, No. 1, pp. 99-128.   DOI
7 Nezu, I. and Sanjou, M. (2008). "Turburence structure and coherent motion in vegetated canopy open-channel flows." Journal of Hydro-environment Research, Vol. 2, No. 2, pp. 62-90.   DOI   ScienceOn
8 Nino, Y. and Garcia, M. H. (1996). "Experiments on particleturbulence interactions in the near-wall region of an open channel flow: Implications for sediment transport." Journal of Fluid Mechanics, 326, pp. 285-319.   DOI   ScienceOn
9 Okamoto, T. A. and Nezu, I. (2010). "Large eddy simulation of 3-D flow structure and mass transport in open-channel flows with submerged vegetations." Journal of Hydro-environment Research, Vol. 4, No. 3, pp. 185-197.   DOI   ScienceOn
10 Raupach, M. R. and Thom, A. S. (1981). "Turbulence in and above plant canopies." Annual Review of Fluid Mechanics, Vol. 13, No. 1, pp. 97-129.   DOI   ScienceOn
11 Smagorinsky, J. (1963). "General circulation experiments with the primitive equations: I. the Basic Experiment." Monthly Weather Review, Vol. 91, No. 3, pp. 99-164.   DOI
12 Wallace, J. M., Eckelmann, H. and Brodkey, R. S. (1972). "The wall region in turbulent shear flow." Journal of Fluid Mechanics, Vol. 54, No. 1, pp. 39-48.   DOI
13 Germano, M., Piomelli, U., Moin, P. and Cabot, W. H. (1991). "A dynamic subgrid-scale eddy viscosity model." Physics of Fluids A: Fluid Dynamics (1989-1993), Vol. 3, No. 7, pp. 1760-1765.   DOI
14 Blackwelder, R. F. and Kaplan, R. E. (1976). "On the wall structure of the turbulent boundary layer." Journal of Fluid Mechanics, Vol. 76, No. 1, pp. 89-112.   DOI
15 Brodkey, R. S., Wallace, J. M. and Eckelmann, H. (1974). "Some properties of truncated turbulence signals in bounded shear flows." Journal of Fluid Mechanics, Vol. 63, No. 2, pp. 209-224.   DOI
16 Corino, E. R. and Brodkey, R. S. (1969). "A visual investigation of the wall region in turbulent flow." Journal of Fluid Mechanics, Vol. 37, No. 1, pp. 1-30.   DOI
17 Gyr, A. and Schmid, A. (1997). "Turbulent flows over smooth erodible sand beds in flumes." Journal of hydraulic research, Vol. 35, No. 4, pp. 525-544.   DOI
18 Harlow, F. H. and Welch, J. E. (1965). "Numerical calculation of time-dependent viscous incompressible flow of fluid with free surface." Physics of Fluids, 8, p. 2182.   DOI
19 Issa, R. I., Gosman, A. D. and Watkins, A. P. (1986). "The computation of compressible and incompressible recirculating flows." Journal of Computational Physics, Vol. 62, No. 1, pp. 62-82.
20 Tominaga, A., Nezu, I., Ezaki, K.. and Nakagawa, H. (1989). "Threedimensional turbulent structure in straight open channel flows." Journal of Hydraulic Research, Vol. 27, No. 1, pp. 149-173.   DOI   ScienceOn
21 Nezu, I. and Nakagawa, H. (1993). Turbulence in open-channel flows, Monograph, Balkema, Rotterdam, The Netherlands.