Numerical investigation of vortex formation at intake structures using flow-3d software /

Tataroğlu, Rüçhan Müge
Formation of the vortices in a horizontal water intake structure composed of a reservoir-pipe system is investigated using 3D numerical modeling. The geometrical and hydraulic conditions of the system such as pipe diameters, the distance between the side walls of the intake and the flow discharge is altered and the critical submergence depth required for the formation of the vortex for each test is determined. Although it is possible to capture an air-entraining vortex in the numerical model, there is a deviation in the critical submergence depth compared with the experimental results. Scale effect on the formation of air-entraining vortex is also investigated comparing model and prototype simulations.


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Aykan, Fatma Serap; Dursunkaya, Zafer (2008-01-01)
The thermal response analysis of an ablative material on a two dimensional external surface is performed. The method considers the whole domain as one continuous computational domain, eliminating the necessity to check the starting and ending positions of the decomposition zone. The current study solves the decomposition of the material at high temperatures by using the nth order Arrhenius equation but excludes the removal of char from the surface due to mechanical erosion or phase change and considers that...
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Kaya, Halil; Uzol, Oğuz; Department of Aerospace Engineering (2012)
In this thesis, two dimensional, incompressible, viscous flow past bluff bodies and a bridge section, in which strong vortex shedding and unsteady attribute of flow are generally found, is simulated by means of random vortex method. The algorithm and method are described in detail. The validation and applicability of the developed numerical implementation to general wind engineering problems is illustrated by solving a number of classical problems, such as flow past circular and square cylinders. An applica...
Numerical Simulation of Rarefied Laminar Flow past a Circular Cylinder
Çelenligil, Mehmet Cevdet (2014-07-18)
Numerical simulations have been obtained for two-dimensional laminar flows past a circular cylinder in the transitional regime. Computations are performed using the direct simulation Monte Carlo method for Knudsen numbers of 0.02 and 0.2 and Mach numbers of 0.102 and 0.4. For these conditions, Reynolds number ranges from 0.626 to 24.63 and the flows are steady. Results show that separation occurs in the wake region for the flow with Mach number of 0.4 and Knudsen number of 0.02, but for the other eases flow...
Numerical Simulation of Flow through Stenotic Artery
Tarman, Işık Hakan (2009-01-01)
Numerical simulation of flow through stenotic artery is performed using spectral element method in an axisymmetric geometry. This method, under suitable conditions, provides high accuracy The use of the weak form of the governing model equations, brings flexibility in treating solution domains with nonstandard geometry. The solenoidal character of the flow is preserved by the treatment of the pressure in a natural way in the numerical formulation. The use of Legendre-Lobatto grid points with its denser dist...
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...
Citation Formats
R. M. Tataroğlu, “Numerical investigation of vortex formation at intake structures using flow-3d software /,” M.S. - Master of Science, Middle East Technical University, 2014.