%0 Journal Article
%T TWO PHASE FLOW MODELING IN SHAFT-SPILLWAYS USING VOLUME OF FLUID (VOF) METHOD
%J Iranian Journal of Science and Technology Transactions of Civil Engineering
%I Shiraz University
%Z 2228-6160
%D 2014
%\ 02/01/2014
%V 38
%N C1
%P 99-109
%! TWO PHASE FLOW MODELING IN SHAFT-SPILLWAYS USING VOLUME OF FLUID (VOF) METHOD
%K Morning glory spillway
%K cavitation
%K VOF method
%K CFD
%R 10.22099/ijstc.2014.1847
%X In this paper, the optimum inlet shape of morning-glory spillway is discussed. Theeffect of some parameters including maximum discharge coefficient and minimum possibilityof cavitation (cavitation index) are investigated. For this purpose, using computational fluiddynamics (CFD) in the form of finite volume method, 3D Navier-Stokes equations of flow atdifferent inlet shapes are solved. Free water surface is modeled by water-air two phase flowand equations are solved by volume of fluid (VOF) method. Flow turbulence is modeled by“K-Є model”. Based on experimental results, models are verified and discharge, velocity,pressure and cavitation index for different inlet shapes are computed and compared with eachother. The morning-glory spillway inlet is modeled using different types of equationsincluding WAGNER equation (Y=aX^3.88), CREAGER equation (Y=aX^1.87) and circularform for their funnel profile shapes. In each model changing the head (h) versus discharge (Q)diagram is drawn and results are compared.
%U http://ijstc.shirazu.ac.ir/article_1847_d1e62f9e428f421656379b4ae279b57f.pdf