Experimental and numerical investigation of vortex formation at multiple horizontal intakes

Download

12625690.pdf

Date

2020-8

Author

Yıldırım, Tuğçe

Metadata

Show full item record

Item Usage Stats

279
views

203
downloads

Although most of the equations given in the literature for critical submergence are for symmetrical single intakes; in practice approach flow conditions are not mainly symmetrical. In this study, formation of the vortices in asymmetrical approach flow conditions was investigated for a multiple water intake structure composed of a reservoir and several pipe systems. Different scenarios were tested when some of the intake units were in operation whereas some others were not. The geometrical and hydraulic conditions of the system such as the distance between the sidewalls of the intake and the flow discharge were altered and the critical submergence required for the formation of the vortex for each test is determined. The variation of dimensionless critical submergence with related dimensionless parameters is presented and empirical equations were derived for single, double and triple intake structures. The results of the experiments were compared with each other and with those presented in the literature. This investigation has done both experimentally and numerically where software namely FLOW-3D was used in the three dimensional numerical simulations. Numerical and experimental results were compared. It was shown that it is not easy to capture air entrainment and free surface dynamics by numerically

Subject Keywords

Su Alma Yapısı, Kritik Batıklık, Vorteks, HAD, FLOW-3D, Horizontal Intakes, Critical Submergence, Vortex

URI

https://hdl.handle.net/11511/69134

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Numerical investigation of flow and scour around a vertical circular cylinder Baykal, Cüneyt; Fuhrman, D. R.; Jacobsen, N. G.; Fredsoe, J. (The Royal Society, 2015-01-28) Flow and scour around a vertical cylinder exposed to current are investigated by using a three-dimensional numerical model based on incompressible Reynolds-averaged Navier-Stokes equations. The model incorporates (i) k-omega turbulence closure, (ii) vortex-shedding processes, (iii) sediment transport (both bed and suspended load), as well as (iv) bed morphology. The influence of vortex shedding and suspended load on the scour are specifically investigated. For the selected geometry and flow conditions, it i...
Experimental test of vision-based navigation and system identification of an unmanned underwater survey vehicle (SAGA) for the yaw motion Kartal, Seda Karadeniz; Leblebicioğlu, Mehmet Kemal; Ege, Emre (SAGE Publications, 2019-05-01) In this study, a nonlinear mathematical model for an unmanned underwater survey vehicle (SAGA) is obtained. The structure of the mathematical model of the vehicle comes from a Newton-Euler formulation. The yaw motion is realized by a suitable combination of right and left thrusters. The navigation problem is solved by using the inertial navigation system and vision-based measurements together. These are integrated to more accurately obtain navigation data for the vehicle. In addition, the magnetic compass i...
Numerical investigation of vortex formation at asymmetric horizontal intakes Sungur, Alper; Köken, Mete; Department of Civil Engineering (2018) Given equations in literature for critical submergence depth is for symmetrical intakes; however, in practice, approach flow conditions are not symmetrical for most of the intakes. In this study, formation of the vortices in a horizontal water intake structure composed of a reservoir-pipe system is investigated with 3D numerical modelling using Flow-3D software. The geometrical and hydraulic conditions of the system such as the distance between the side walls of the horizontal intake, pipe diameters and the...
Relaxation to steady state in neutral-beam-injected mirrors Mirnov, V; Demokan, O (1996-05-01) The time-dependent Vlasov-Boltzmann equation is analytically studied in mirror machines with perpendicular injection. The atomic and collisional processes are taken into account, with their explicit, rigorous forms. A uniform model is assumed by considering a square-well magnetic field configuration, and the mirrors are represented by related boundary conditions on the ion distribution function. It is shown that, the ion density increases from the initial value, drops by a certain amount, then increases aga...
Differential constrains, recursion operators, and logical integrability Satir, A (Springer Science and Business Media LLC, 1997-10-01) Differential constraints compatible with the linearized equations of partial differential equations are examined. Recursion operators are obtained by integrating the differential constraints.

Citation Formats

T. Yıldırım, “Experimental and numerical investigation of vortex formation at multiple horizontal intakes,” Ph.D. - Doctoral Program, Middle East Technical University, 2020.