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Fluid off-takes and complex delivery ducts are common in many engineering systems but designing them can be a challenging task. At the conceptual design phase many system parameters are open to consideration and preliminary design studies are necessary to instruct the conceptualisation process in an iterative development of design ideas. This paper...
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Purpose
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Citations
... Engineers commonly use LES for the CFD evaluation of turbulent flow, thanks to the evolution of modern computers, which allows increasing the number of cells implemented during the domain discretisation while keeping a reasonable time for running the studied cases. However, its implementation in optimisation, although possible [31], is still a challenge, as the processing time applies to various configurations to trace the search path toward the optimum condition. A common alternative to overcome this issue involves the design of experiments (DoE) with a limited number of simulations, N, but enough for constructing a surrogate model to predict the response of the studied variables in locations different from the samples evaluated using CFD [32]. ...
... Finally, Equation (20) allows computing the utopian values f o i , where ( f o i ) represents a restrictive condition of the apparatus, ( f i ) min the minimum value of the objective function in generated data, and α is a user-setting parameter that depends on the level of performance required in the design. Given that the utopian values are always lower than the minimum observations of the design objective, this parameter has to be lower than one [31]. ...
This study explores the feasibility of using an oscillating plate downstream of a cylindrical body to produce mechanical energy from a Von Kármán vortex street under sub-critical flow conditions (Re = 72,500). The study aims to quantify the impact of the plate length, its separation from the cylinder, and a machine damping factor on the power coefficient and the blade’s displacement to identify the optimal configuration. This preliminary assessment assumes that the plate oscillation is small enough to avoid changes in the vortex dynamics. This assumption allows the construction of a surrogate model using Computational Fluid Dynamics (CFD) to evaluate the effect of plate length and separation from the cylinder on the fluctuating lift forces over the plate. Later, the surrogate model, combined with varying machine damping factors, facilitates the description of the device’s dynamics through the numerical integration of an angular momentum equation. The results showed that a plate with a length of 0.52D, a separation of 5.548D from the cylinder, and a damping factor of 0.013 achieved a power coefficient of 0.147 and a perpendicular displacement of 0.226D. These results demonstrate a substantial improvement in the performance of blade-less generators.
... (Faktöriyel Metod) The factorial experimental design method is an effective technique for estimating the main effects on the test results. In addition, the application of this method is quite easy in experimental works that need optimization [9]. In the full factorial experiment design method, the experiment costs and experiment times increase as the combinations of all the levels of the factors are tried one by one.To summarize briefly, there is maximum time and cost in full factorial experimental design. ...
Aluminium is one of the basic materials used in many sectors, especially in automotive, defence and aviation. Generally, aluminium parts are manufactured by using injection molding methods in many sectors, such as automotive, etc. Injection presses that are used for die-casting material have a lot of parameters, affect the molded parts’ properties. In this study, the effect of injection parameters on the mechanical properties was investigated. Firstly, a test part that is shaped currently on the injection press machine in a sector was found out. An aluminum alloy, named Al〖Si〗_12 Cu (EN AC 47000), that is used widely in die-casting techniques was preferred. Three injection parameters, such as, injection velocity (m/s), time of the mold opening (s) and molten metal temperature (0C), were selected. And all works were planned with the full factorial experimental design method. Thus, the test parts were manufactured by using an injection molding machine. Moreover, many tests, such as hardness and tensile, were performed on the test parts to investigate the effect of injection parameters on the mechanical properties of the material. The tests were analysed with the full factorial and ANOVA method. As a results of the analysis, the highest hardness value was obtained as 85 HB when the molten metal temperature was 750 ℃, the injection velocity was 1.3 m/s, the mold opening time was 10 s, and the highest breaking strength was obtained as molten metal temperature 725 ℃, injection velocity 4 m/s, when the mold opening time was 12 s was found to be 264 MPa.
... Engineers commonly use LES for the CFD evaluation of turbulent flow, thanks to the evolution of modern computers, which allow increasing the number of cells implemented during the domain discretisation while keeping a reasonable time on the running of studied cases. However, its individual implementation in optimisation, although possible [27], is still a challenge, as the processing time applies to a relevant number of configurations that trace the searching path toward the optimum condition. A common alternative to overcome this issue involves a design of experiments (DoE) with a limited number of simulations N, but adequate to construct a surrogate model to predict the studied variables' response in places different from the samples evaluated using CFD [28]. ...
This study explores the feasibility of using an oscillating plate downstream of a cylindrical body to produce mechanical energy from a Von Kármán vortex street. The study aims to quantify the impact of the plate length, its separation from the cylinder, and a machine damping factor on the power coefficient and the blade’s displacement to identify the optimal configuration. This preliminary assessment assumes that the plate oscillation is small enough to avoid changes in the vortex dynamics. This assumption allows the construction of a surrogate model using CFD to evaluate the effect of plate length and separation from the cylinder on the fluctuating lift forces over the plate. Later, the surrogate model, combined with varying machine damping factors, facilitates the description of the device’s dynamics through the numerical integration of an angular momentum equation. The results showed that a plate with 0.52D length, 5.548D separation from the cylinder, and a damping factor of 0.013 achieved a power coefficient of 0.147 and a perpendicular displacement of 0.266D. These results demonstrate a substantial improvement in the performance of bladeless generators.