scholarly journals Numerical and Physical Investigation of the Performance of Turbulence Modeling Schemes around a Scour Hole Downstream of a Fixed Bed Protection

Water ◽  
2018 ◽  
Vol 10 (2) ◽  
pp. 103 ◽  
Author(s):  
◽  
◽  
Keyword(s):  
Turbulence Modeling ◽  
Fixed Bed ◽  
Physical Investigation ◽  
Scour Hole ◽  
Bed Protection

scholarly journals Physical Modeling of Spatial and Temporal Development of Local Scour at the Downstream of Bed Protection for Low Froude Number

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 1041 ◽  
Author(s):  
Sung Won Park ◽  
Jin Hwan Hwang ◽  
Jungkyu Ahn
Keyword(s):  
Equilibrium State ◽  
Froude Number ◽  
Fixed Bed ◽  
Local Scour ◽  
Dominant Factor ◽  
Scour Depth ◽  
Dimensionless Time ◽  
Temporal Development ◽  
Low Froude Number ◽  
Bed Protection

Local scour at the downstream of the river bed protection is one of the most important parameters for the design criteria and sustainable management of the hydraulic structures. Previously, various researches on its process in the equilibrium state have been suggested with experimental and numerical approaches. In this study, relatively long-term laboratory experiments of local scouring at the downstream of fixed bed in an open channel were conducted with mono-granular sediment bed and analyzed about maximum scour depth and its temporal development. In particular, we conducted experiments with relatively low Froude number (less than 0.5) and their duration of tests was exceeded over 700 hours. We modified the relationship between the dimensionless time and length scales of the maximum scour depth of the local scour hole based on the turbulent shear layer thickness. A new functional relationship between dominant factors and the maximum scour depth in the equilibrium state were suggested and compared with previously suggested formula. Also, from the results by nonlinear regression, Froude number was founded as a dominant factor on the prediction of equilibrium maximum scour depth.

AN EULERIAN-LAGRANGIAN SPRAY AND ATOMIZATION MODEL WITH IMPROVED TURBULENCE MODELING

2009 ◽  
Vol 19 (8) ◽  
pp. 727-739 ◽  
Author(s):  
Wei Ning ◽  
Rolf D. Reitz ◽  
Ramachandra Diwakar ◽  
Andreas M. Lippert
Keyword(s):  
Turbulence Modeling
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