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Turbulence structure of open channel flows over permeable and impermeable beds: A comparative study
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10.1063/1.3276292
/content/aip/journal/pof2/21/12/10.1063/1.3276292
http://aip.metastore.ingenta.com/content/aip/journal/pof2/21/12/10.1063/1.3276292

Figures

Image of FIG. 1.
FIG. 1.

Flow subdivision in open channel flows over permeable beds, the solid line represents a possible mean velocity profile.

Image of FIG. 2.
FIG. 2.

Measurement window for the PIV experiments and positioning of the laser sheet.

Image of FIG. 3.
FIG. 3.

Display of the UVP probe within the porous medium; (a) UVP probe inserted into the top pore; (b) positions of the UVP probe within the bed, i.e., pores 1–4.

Image of FIG. 4.
FIG. 4.

Spatially averaged flow statistics. Open and filled symbols stand for one and five layer beds, respectively; ; ; is the flow depth; is the shear velocity as defined in Table I.

Image of FIG. 5.
FIG. 5.

TKE production term scaled with and flow depth ; ; open and filled symbols stand for one and five layer beds, respectively; is the shear velocity as defined in Table I.

Image of FIG. 6.
FIG. 6.

Normal and shear form-induced stress normalized with ; open and filled symbols stand for one and five layer beds, respectively; is the shear velocity as defined in Table I; is the spheres' diameter.

Image of FIG. 7.
FIG. 7.

Normal and shear form-induced stress normalized with ; open and filled symbols stand for one and five layer beds, respectively; is the spheres' diameter.

Image of FIG. 8.
FIG. 8.

Horizontal profiles of time-averaged velocities measured within the porous medium. Time-averaged velocities are in mm/s.

Image of FIG. 9.
FIG. 9.

DA velocity profiles for (a) the whole flow field, (b) the subsurface flow; is the spheres' diameter.

Image of FIG. 10.
FIG. 10.

Turbulence intensity profiles; ; for ; for ; is the shear velocity as defined in Table I; is the spheres' diameter.

Image of FIG. 11.
FIG. 11.

Turbulence intensity of the bed-parallel velocity component normalized with local DA velocities; ; is the spheres' diameter.

Image of FIG. 12.
FIG. 12.

Skewness profiles for (a) bed-parallel and (b) bed-normal velocity components; ; ; is the spheres' diameter.

Image of FIG. 13.
FIG. 13.

Two point correlation functions; is the bulk mean velocity (Table I); is the flow depth.

Image of FIG. 14.
FIG. 14.

Eddy convection velocity normalized with local mean velocity for large and small eddies within the porous medium. At pore 1 the advection velocity for small scale turbulence could not be computed due to the absence of the secondary peaks in the cross-correlation function (Fig. 13).

Image of FIG. 15.
FIG. 15.

Energy spectra in the wave number domain obtained from UVP measurements at pores 1–4 for low Re experiment; is the flow depth.

Tables

Generic image for table
Table I.

Hydraulic conditions for the experiments; is the flow depth measured from the bead tops to free surface; S is the slope of the bed; Re is the bulk Reynolds number; is the permeability Reynolds number; is the depth averaged velocity; is the hydraulic radius; is the permeability of the bed; is the porosity of the bed; and are the bed shear stress calculated as in Eqs. (1) and (2), respectively; is the bed shear stress obtained from extrapolation of the spatially averaged Reynolds stress profile to the bead tops; is the friction factor.

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/content/aip/journal/pof2/21/12/10.1063/1.3276292
2009-12-31
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Turbulence structure of open channel flows over permeable and impermeable beds: A comparative study
http://aip.metastore.ingenta.com/content/aip/journal/pof2/21/12/10.1063/1.3276292
10.1063/1.3276292
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