Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Design of Centrifugal Blood Pump(01. Izmir Institute of Technology, 2020) Sarızeybek, Ceren; Özkol, ÜnverIn this thesis a maglev centrifugal blood pump is studied numerically which will be used in ECMO systems. Aim was to design a pump with 3.3 L/min at 5000 rpm having 200 mmHg head. Pump is designed by SolidWork and CFD studies are applied in Ansys Fluent. Firstly, blade discharge angle values between 20 degree and 40 degree are simulated with 5 degree intervals and 35 degree is found to be the most appropriate for hydraulic efficiency and head. Likewise, six different up-clearance values between 2.0 mm and 0.1 mm are studied to see effect of up-clearance on head and efficiency. Also to predict hemolysis for different up-clearance values, Giersiepen power law hemolysis model with Lagrangian approach is employed. 0.1 mm up-clearance is found suitable. For this up-clearance hemolysis is calculated as 4%.Master Thesis Modification of a Computational Fluid Dynamics Model (ansys-Fluent) for the Purpose of River Flow and Sediment Transport Modeling(Izmir Institute of Technology, 2015) Ekmekçi, Hüseyin Burak; Elçi, ŞebnemPrecise estimation of the sediment transport and settling velocity of particle in turbulent flows is required for many engineering applications including modeling of the transport of suspended sediments and the transport of particle pollutants. This study presents an approach for modification of an existing CFD Model for sediment transport in turbulent flow based on field measurements. In the first part, synchronized 3-D velocity and temperature time series were monitored at Büyük Menderes River in Turkey where the data were utilized to characterize the turbulence characteristics and model particle – fluid interaction. Sieve and hydrometer analysis were obtained from earlier studies to understand and modify sediment transport under different conditions via ANSYS Fluent programme. The second part of the study involved numerical modeling of hydrodynamics via 3D CFD model in the selected portion of a river body through use of field measurements conducted at the study site. The k-ω turbulence model found to be the best suited when such flow around a structure as piers or flow through a water intake is considered. Effect of particle size, concentration and modeling approach for particle motion are also investigated and Rossin Rammler Logarithmic Distribution and multiphase modeling approach was the most appropriate methods. This study involved development of an approach to modify drag force on sediment particles using turbulence characteristics in the Fluent solver as well.