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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : A two-dimensional depth averaged model for mixed flows simulation
A two-dimensional depth averaged model for mixed flows simulation
Author : HAMID BASHIRI ATRABI(1), TAKASHI HOSODA(2) & HIDEKAZU SHIRAI(3)
ABSTRACT
In this study a two-dimensional (2D) depth averaged model is developed to simulate the transient flow from pressurized
to free surface flow. This kind of flow can be occurred due to the rapid movement of a gate. The model is based on the
hydrostatic pressure distribution in free surface region and the depth averaged continuity and momentum equations are
used for the pressurized flow, free surface flow and the interfaces of both regions. In this model, the finite volume
method (FVM) with the staggered grid system is used for flow calculations. The flood invasion analysis in flood plains is
applied for the free surface region and the highly simplified marker and cell (HSMAC) method with pressure iteration
procedure is applied for the pressurized part to recalculate the pressure and velocity. The numerical approach is an
interface tracking and after finding the positions of interfaces, pressure drop is considered at the interfaces. To evaluate
the numerical model, we conducted a few experiments in a square box based on the Benjamin flow with L- type gate
using air and water as the two fluids. Initially, one part of the box was full of water under the pressurized condition and
after removing the gate air was entered to the pressurized part. The main aim of this study is to simulate the water
surface profile near the cavity front and also downstream of it. The two-dimensional numerical simulations are compared
with the experimental data. The results showed good agreement and lead to the conclusion that the pressure drop at the
interfaces is necessary.
File Size : 1,721,869 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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