چکیده:
One of the most concerning issues for researchers is to predict the shape and dimensions of the scour pit near
hydraulic structures such as the base of bridges, weirs, valves and stilling basins due to both financial and human
hazards induced by destruction of the structure. As the scour issue has its own complexity in relation to the
multiplicity of effecting factors on it, in this study therefore, the results of laboratory analysis of local scour due to
submerged horizontal jets were compared with numerical simulation results from Flow-3D three-dimensional model
to test the potency of the numerical model. As a result, the model is proposed in place of the experimental model
which has its own drawbacks and high costs. In this study, we measure maximum scour depth in relative equilibrium
in 2 states and 6 test modes with different valve openings and tail water depth per different discharges. Comparison
of the results indicates about 11% error for Flow-3D numerical model in relation to the experimental model which by
considering the complexity of scour and deposition phenomena, is considered a good result.
خلاصه ماشینی:
"ir Desert 20-1 (2015) 47-55 Simulation of local scour caused by submerged horizontal jets with Flow-3D numerical model M.
As the scour issue has its own complexity in relation to the multiplicity of effecting factors on it, in this study therefore, the results of laboratory analysis of local scour due to submerged horizontal jets were compared with numerical simulation results from Flow-3D three-dimensional model to test the potency of the numerical model.
A schematic view of longitudinal scour profile formed at apron downstream caused by submerged horizontal jet One of the capabilities of Flow – 3D is that this software could choose a numerical solution as the final solution of a problem by meshing and solving unknown points in relation to known points.
Therefore, this study aims to compare results of laboratory analysis of local scour caused by submerged horizontal jet with numerical simulation results of Flow-3D three dimensional model.
However, the importance of scour is evident when its depth becomes considerable and reaches the foundation of river structuresdeclining their stability or damaging them; that is, aggregation of eroded material could affect the performance of dams and hydraulic structures by changing tail water level.
Numerical study on the effects of internal friction angle of sediments on scour hole caused by free fall Jet. 2th National Conference on Dam and Hydroelectric Power Plants, 14&15 May, Tehran, Iran Bakhiet, Sh."