İnşaat Mühendisliği Bölümü Makale Koleksiyonu
http://hdl.handle.net/11772/823
İnşaat Mühendisliği Bölümü'ne ait makale çalışmalarının içerir2024-03-29T09:04:43ZComputation methods of discharge in compound channels
http://hdl.handle.net/11772/1076
Computation methods of discharge in compound channels
Gemici, Ercan; Gemici, Betül Tuba
Water which is one of the basic requirements for continuation life occasionally causes floods that threaten the living life. The floods which
are after cloudburst in the summer months or with snow melt at the end of winter frequently occur with flood out of the main bed water.
Sections which are the main channel and floodplains are called compound channels. Floodplains, which are at one or both sides of the main
channel, only occur during flood time. The most important parameter in the design of flood protection structures is discharge. However,
discharge of compound channels varies depending on many factors. Experimental methods, which are mostly developed considering the water
levels in main and flood channels, are often used in flow calculations. In the study, the errors of calculated discharge with Single Channel
Method (SCM), Divided Channel Method (DCM) and Exchange Discharge Method (EDM) were compared in symmetrical and two floodplains
compound channels. Side slopes of main channels are designed trapezoidal and rectangular. Side slopes of floodplains have been constituted
vertically. Comparing the performance of the methods for four different discharge between 9-27 L/s, SCM and DCM have been shown to reach
over 10% relative error value in low discharge. At high discharges, the absolute relative error of DCM drops below 2%. Although the errors
of the methods generally decrease with increasing discharge, the average absolute relative error of all methods is found to be over 5% in the
compound channel which is trapezoidal of main channel side slope.
2018-01-01T00:00:00ZLiquid sloshing damping in an accelerated tank using a novel slot-baffle design
http://hdl.handle.net/11772/519
Liquid sloshing damping in an accelerated tank using a novel slot-baffle design
Demirel, Ender; Aral, Mustafa M.
A slot-baffle design used in water treatment tanks previously developed by the authors is used to suppress sloshing effects in an accelerated tank. This new application is another example of the versatility of the slot-baffle design in inducing turbulence in fluid flow systems, which has numerous uses in engineering applications. Large amplitude surface waves in a harmonically excited tank are simulated using a second-order accurate numerical model in OpenFOAM. The verification of the numerical model is performed by comparing the numerical results with existing laboratory measurements, which show a favorable agreement. Various slot configurations are studied in order to evaluate the damping performance during the external excitation of the tank. It is shown that the present design shows an effective dissipation performance in a broad range of oscillation frequencies, while 88% of the internal kinetic energy of the liquid is dissipated over thirty oscillation periods for the resonance case.
2018-01-01T00:00:00ZOptimal energy recovery fromwater distribution systems using smart operation scheduling
http://hdl.handle.net/11772/518
Optimal energy recovery fromwater distribution systems using smart operation scheduling
Telci, İlker T.; Aral, Mustafa M.
Micro hydropower generators (micro turbines), are used to recover excess energy from hydraulic systems and these applications have important potential in renewable energy production. One of the most viable environments for the use of micro turbines is the water distribution network where, by design, there is always excess energy since minimum pressures are to be maintained throughout the system, and the system is designed to meet future water supply needs of a planning period. Under these circumstances, maintaining the target pressures is not an easy task due to the increasing complexity of the water distribution network to supply future demands. As a result, pressures at several locations of the network tend to be higher than the required minimum pressures. In this paper, we outline a methodology to recover this excess energy using smart operation management and the best placement of micro turbines in the system. In this approach, the best micro turbine locations and their operation schedule is determined to recover as much available excess energy as possible from the water distribution network while satisfying the current demand for water supply and pressure. Genetic algorithms (GAs) are used to obtain optimal solutions and a “smart seeding” approach is developed to improve the performance of the GA. The Dover Township pump-driven water distribution system in New Jersey, United States of America (USA) was selected as the study area to test the proposed methodology. This pump-driven network was also converted into a hypothetical gravity-driven network to observe the differences between the energy recovery potential of the pump-driven and gravity-driven systems. The performance of the energy recovery system was evaluated by calculating the equivalent number of average American homes that can be fed by the energy produced and the resulting carbon-dioxide emission reductions that may be achieved. The results show that this approach is an effective tool for applications in renewable energy production in water distribution systems for small towns such as Dover Township. It is expected that, for larger water distribution systems with high energy usage, the energy recovery potential will be much higher.
2018-01-01T00:00:00Z