This paper uses CFD code to simulate the 3D flow and local scouring around bridge piers. The 3D N... more This paper uses CFD code to simulate the 3D flow and local scouring around bridge piers. The 3D Navier-Stokes equations are solved with Finite Difference Method and the RNG κ-ε turbulence model is selected and the bed load model is based on the excess bed shear stress applied by the flowing water. The free surfaces are modeled with the Volume of Fluid (VOF) technique. Simulated results include scour depth around six different shapes of bridge piers and velocity distribution around piers. The calculations of velocity distribution and scour depth are conducted based on previously laboratory experiments. Comparison of the results between the numerical model and experimental model indicates about (5.1%-9.8%) and (1.8%-6.1%) ranged errors for prediction scour depth and maximum velocity, respectively, is considered a good results. The CFD code provides an economic way to predict potential results. Also, it seen that the CFD code is an effective tool for analyzing free surface flows and scour depth around bridge piers.
The study of local scour around bridge piers is very important for safe design of piers and other... more The study of local scour around bridge piers is very important for safe design of piers and other hydraulic structures. In this study, shape of pier is the main concern with three different velocities (0.18, 0.25, and 0.3) m/sec and other parameters like flow depth, bed material and etc. are remain same for all experiments. The experiments were conducted using laboratory flume, operated under the clear water condition using sand as a bed material. The test program was done on ten different streamline. were used to investigate the effect of the bridge pier's shape on local scour to conclude the optimal shape that gives minimum depth of scour. Comparison of results show that scour at upstream is directly proportional to exposed area of upstream nose of pier. The results showed that the rectangular pier gives the largest scour depth (7.6) cm, while the streamline shape gives the lowest scour depth (3) cm. The equilibrium scour depth of pier models compared with theoretical equations has been developed by some researchers and the results were very close.
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Papers by Zaid Hadi