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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Comparative analysis of the modification of turbulence and its effects on a trapezoidal section stil...
Comparative analysis of the modification of turbulence and its effects on a trapezoidal section stilling basin.
This present work aims to characterize a turbulent flow that occurs in a trapezoidal section stilling basin, which belongs to
the "Tunel Emisor Oriente" (TEO) project, concerning to the deep drainage system from the Mexico City, with a design
caudal of 240 m³/s. The physical model was constructed with a 1:30 scale, where it was found that its functionality during
the design condition set up would be committed due to overflow. Through modification of the geometrical characteristics of
the chute, at the entrance section of the tank, we sought to obtain a higher dissipation of turbulent kinetic energy (TKE) and
decrease the levels variations of water depth. To evaluate these new geometries and their effects, three different physical
assays were performed on the model, these being: the test on the smooth spillway (smooth spillway), the second one was
carried out by increasing its roughness using steps in the chute (stepped spillway) and the third and last one exchanging
the steps with two rows of baffles with the form of teeth (spillway with deflectors). The physical model was instrumented with
acoustic Doppler Velocimeter (ADV) and a digital water level gage. With which the instantaneous speed and level
fluctuations was measured, also with this a grid was drawn to calculate the velocity, turbulent kinetic energy (TKE) and its
dissipation. In addition, a CFD modeling was performed using the computational software FLOW 3D with same dimensions
as the physical model to compare the modification of turbulence. From the comparison of the physical and numerical models
some similarity in the calculated indexes is observed, however it is noted that the numerical model underestimates values,
so it is necessary some modification in its parameters in order to obtain better results, closer to reality.
File Size : 1,191,439 bytes
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 28/08/2015
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