The method of lines solution of time-dependent 2D navier-stokes equations for incompressible separated internal flows

Oymak, Olcay


Validation of depth-averaged mixing length turbulence model for uniform channel flows/
Karaman, Çağrı Hasan; Aydın, İsmail; Department of Civil Engineering (2014)
A one-dimensional depth averaged turbulence model based on volumetric mixing length definition is developed for shallow flows. Numerical solution of the model is done using finite volume method for steady, uniform closed duct flows to observe lateral momentum exchange over depth discontinuities. The model is verified by comparison to two-dimensional numerical solutions and to the experimental data available in the literature. The model is then applied to uniform free surface flows in rectangular and compoun...
The cognition of grammatical structures
Gitlin, Gloria (2010-02-08)
Students today have a need to express themselves. However, there are fewer and fewer students who can put their ideas on paper. Students are embarrassed by this development, and it affects their sense of self-worth. The purpose of the study was to find a method of instruction which would help students access their thoughts, discover their ideas, and convey them to others. The method used was one of associating grammatical structures to student cognitions. Over several years of observation of student perform...
Design and analysis of a vertical axis water turbine for river applications using computational fluid dynamics
Demircan, Eren; Aksel, Mehmet Haluk; Pınarcıoğlu, Mehmet Melih; Department of Mechanical Engineering (2014)
The main purpose of this study is to design a Darrieus rotor type vertical axis water turbine using Computational Fluid Dynamics (CFD) in order to be used in river currents. The CFD modeling is based on two dimensional numerical solution of the rotor motion using commercial Unsteady Reynolds Averaged Navier-Stokes solvers, Ansys Fluent and CFX. To validate the two dimensional numerical solution, an experimental Darrieus rotor type water turbine from literature is studied and performance of several turbulenc...
The dual reciprocity boundary element solution of helmholtz-type equations in fluid dynamics
Alsoy Akgün, Nagehan; Tezer Sezgin, Münevver; Department of Mathematics (2013)
In this thesis, the two-dimensional, unsteady, laminar and incompressible fluid flow problems governed by partial differential equations are solved by using dual reciprocity boundary element method (DRBEM). First, the governing equations are transformed to the inhomogeneous modified Helmholtz equations, and then the fundamental solution of modified Helmholtz equation is used for obtaining boundary element method (BEM) formulation. Thus, all the terms in the equation except the modified Helmholtz operator ar...
Application of fully implicit coupled method for 2D incompressible flows on unstructured grids
Zengin, Şeyda; Tarman, Işık Hakan; Department of Engineering Sciences (2012)
In the subject of Computational Fluid Dynamics (CFD), there seems to be small number of important progress in the pressure-based methods for several decades. Recent studies on the implicit coupled algorithms for pressure-based methods have brought a new insight. This method seems to provide a huge reduction in the solution times over segregated methods. Fully implicit coupled algorithm for pressure-based methods is very new subject with only few papers in literature. One of the most important work in this a...
Citation Formats
O. Oymak, “The method of lines solution of time-dependent 2D navier-stokes equations for incompressible separated internal flows,” Ph.D. - Doctoral Program, Middle East Technical University, 1997.