scholarly journals A non-invasive acoustical method to measure the mean roughness height of the free surface of a turbulent shallow water flow

2014 ◽  
Vol 85 (11) ◽  
pp. 114902 ◽  
Author(s):  
A. Krynkin ◽  
K. V. Horoshenkov ◽  
A. Nichols ◽  
S. J. Tait
Keyword(s):  
Free Surface ◽  
Shallow Water ◽  
Water Flow ◽  
Roughness Height ◽  
Shallow Water Flow ◽  
Non Invasive ◽  
Acoustical Method ◽  
The Mean

scholarly journals Flow structure from a horizontal cylinder coincident with a free surface in shallow water flow

2012 ◽  
Vol 16 (1) ◽  
pp. 93-107 ◽  
Author(s):  
Ali Kahraman ◽  
Muammer Özgören ◽  
Beşir Şahin
Keyword(s):  
Free Surface ◽  
Shallow Water ◽  
Water Flow ◽  
Vortex Formation ◽  
Flow Characteristics ◽  
Lower Surface ◽  
Horizontal Cylinder ◽  
Bottom Surface ◽  
Shallow Water Flow ◽  
Cylinder Diameter

Vortex formation from a horizontal cylinder coincident with a free surface of a shallow water flow having a depth of 25.4 [mm] was experimentally investigated using the PIV technique. Instantaneous and time-averaged flow patterns in the wake region of the cylinder were examined for three different cylinder diameter values under the fully developed turbulent boundary layer condition. Reynolds numbers were in the range of 1124? Re? 3374 and Froude numbers were in the range of 0.41 ? Fr ? 0.71 based on the cylinder diameter. It was found that a jet-like flow giving rise to increasing the flow entrainment between the core and wake regions depending on the cylinder diameter was formed between the lower surface of the cylinder and bottom surface of the channel. Vorticity intensity, Reynolds stress correlations and the primary recirculating bubble lengths were grown to higher values with increasing the cylinder diameter. On the other hand, in the case of the lowest level of the jet-like flow emanating from the beneath of the smallest cylinder, the variation of flow characteristics were attenuated significantly in a shorter distance. The variation of the reattachment location of the separated flow to the free-surface is a strong function of the cylinder diameter and the Froude number.

Dealing with shallow-water flow in the deepwater Gulf of Mexico

2002 ◽  
Vol 21 (7) ◽  
pp. 660-668 ◽  
Author(s):  
R. M. Ostermeier ◽  
J. H. Pelletier ◽  
C. D. Winker ◽  
J. W. Nicholson ◽  
F. H. Rambow ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Shallow Water ◽  
Water Flow ◽  
Shallow Water Flow
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