Investigation of the boundary layer transition, the turbulent boundary layer development and the recovery length of the turbulent boundary layer behind three dimensional roughness elements.

Albayrak, Kahraman


Investigation of wind effects on tall buildings through wind tunnel testing
Kayışoğlu, Bengi; Kurç, Özgür; Department of Civil Engineering (2011)
In recent years, especially in the crowded city-centers where land prizes have become extremely high, tall buildings with more than 30 floors have started to be designed and constructed in Turkey. On the other hand, the technical improvements have provided the opportunity of design and construction of more slender structures which are influenced by the wind actions more. If the building is flexible, wind can interact with it so the wind induced oscillations can be significantly magnified. In order to analyz...
Investigation of inviscid shear layer by linear stability theories
Topbaş, Ahmet Emre; Özgen, Serkan; Department of Aerospace Engineering (2018)
ThisIn this thesis, spatial and temporal instabilities of the inviscid shear layer flows are investigated using the linear stability theory. Utilizing the small and wavy disturbances, Rayleigh equation was derived from the Helmholtz vorticity equation. For the hyperbolic-tangent velocity profile, the Rayleigh equation was solved by using space and time amplification approaches by an in-house Fortran code involving RK4 and simplex method algorithm. Eigenvalues of various disturbance frequencies were calculat...
Verification of empirically determined support systems of the Kılıçlar highway tunnel by numerical modelling
Çelik, Gözde; Topal, Tamer; Department of Geological Engineering (2011)
The aim of this study is to determine the geological and geotechnical characteristics of Kılıçlar Tunnel on Ankara-Kırıkkale Highway, to suggest the appropriate support and excavation systems and verify these suggested support systems via numerical modeling. The length of Kılıçlar Tunnel is 1110 m. The width of tunnel is 16 m, the height is 10 m and the maximum overburden height is 90 m. Since Ankara-Kırıkkale Highway consists of 2x3 lanes, the tunnel is designed as a twin tube tunnel. Kılıçlar Tunnel is pl...
Investigation of Wind Effects on Tall Buildings through Wind Tunnel Testing
Kurç, Özgür; Shojaee, S. M. Nima; Uzol, Oğuz (2012-10-01)
There has been significant increase in tall building construction in Turkey in the last decade. As the height of building increase, wind effects become more pronounced. Wind can interact with flexible buildings and can significantly magnify the wind loads and wind induced oscillations. Wind tunnel tests have been widely utilized for estimating the wind effects on buildings. In order to perform a successful test, however, flow conditions inside the tunnel must represent the actual conditions rather closely. ...
Investigation of the relationship between aerosol and rainwater composition
Türküm, Ahmet; Tuncel, Süleyman Gürdal; Department of Environmental Engineering (2004)
Chemical composition of particles and rain water at three sites in Turkey were extensively compared to determine if there is a relationship between aerosol and rain composition. If such relationship exists, it can allow one to construct rain water composition using aerosol data. This is important because, rain composition data is scarce as sampling and analysis of very low concentrations of elements and ions in rain water is more difficult compared to sampling and analysis of atmospheric aerosol. Results sh...
Citation Formats
K. Albayrak, “Investigation of the boundary layer transition, the turbulent boundary layer development and the recovery length of the turbulent boundary layer behind three dimensional roughness elements.,” Ph.D. - Doctoral Program, Middle East Technical University, 1984.