S273 : Numerical simulation of hydraulic jump on rough surfaces by using Flow-3D model
Thesis > Central Library of Shahrood University > Agricultural Engineering > MSc > 2015
Authors:
Abstarct: To prevent damage bring about by high energy of water in supercritical streams and also to get rid of excess kinetic energy in the streams is used structures such as energy dissipators in the downstream of the flow. Stilling basins is a good example of dissipators structures that can be formed in which the hydraulic jump stilling basins and ponds annexes performance, reduce the amount of energy available. In the present work, hydraulic jump on the rough levels with the integrated trapezoidal blocks using the software flow-3d and was a k-ɛ model were simulated. Forty numerical experiments with different discharges in ranging Froude numbers from 3/88 to 12/01 with an initial depth, 55.1cm, was implemented. Our results indicated that the current profile in the hydraulic jump for all the simulations conducted with the use of flow-3d software are the same. Also, the comparison of numerical and experimental results showed that the sequent depth ratio amounts, length of hydraulic jump and roller length simulated and experimental are relatively compatible with each other. Additionally, the sequence depth ratio was reduced by Increasing the distance between the roughness reduced by 10 percent , also , the hydraulic jump length and roller length as well as increasing distance between the roughness were reduced (6.4 to 22.8 for hydraulic jump length). Distribution without the speed dimension in the hydraulic jump for all Froude numbers was the same. Increasing distance and height the roughness not only reduced the speed near the bed but also increased shear stress and the velocity distribution slope near the bed. In rough substrates, relative energy loss are increased by raising the Froude number.
Relative energy loss in rough substrates are more than of flat substrates in the same Froude number. Change the height and the distance between the roughness increases the amount of relative energy loss.
Keywords:
#hydraulic jump #rough levels #software flow-3d #model k-ɛ #sequence depth #hydraulic jump length #roller length #velocity distribution #relative energy loss Link
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
Visitor: