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Energy harvesting from oscillating body in a fluid flow
Słowiaczek, Kamil ; Pluskal, Tomáš (referee) ; Habán, Vladimír (advisor)
In this thesis, numerical simulations of a flow around a cylinder with prescribed harmonic motion are conducted. To set the cylinder in motion, a dynamic mesh is utilized, and the movement is defined using a UDF (User-Defined Function). The influence of the amplitude of displacement and the frequency of motion on the device's performance is examined. Additionally, the additional effects of the fluid acting on the body are evaluated. Finally, an experiment designed to validate the simulations is described.
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Checking of heat exchanger to flow-induced vibration
Mazura, František ; Pernica, Marek (referee) ; Buzík, Jiří (advisor)
This bachelor thesis focuses on the thermal-hydraulic design of the heat exchanger and flow induced vibrations checking. The introductory part describes the basic distribution and function of heat exchangers. The next part introduces the thermal-hydraulic design in the Python programming language using the Kern‘s method for an U-tube heat exchanger. Thermal-hydraulic design outputs are compared with values from HTRI software. Subsequently, the issue of the flow induced vibrations is characterized and the checking of these vibrations according to the normalized TEMA standard is performed. Finally, the heat exchanger is checked using the Poddar & Polley graphical method.
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Checking of heat exchanger to flow-induced vibration
Mazura, František ; Pernica, Marek (referee) ; Buzík, Jiří (advisor)
This bachelor thesis focuses on the thermal-hydraulic design of the heat exchanger and flow induced vibrations checking. The introductory part describes the basic distribution and function of heat exchangers. The next part introduces the thermal-hydraulic design in the Python programming language using the Kern‘s method for an U-tube heat exchanger. Thermal-hydraulic design outputs are compared with values from HTRI software. Subsequently, the issue of the flow induced vibrations is characterized and the checking of these vibrations according to the normalized TEMA standard is performed. Finally, the heat exchanger is checked using the Poddar & Polley graphical method.
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Matematické a fyzikální modelování prouděním vyvolaného kmitání lidských hlasivek
Šidlof, Petr ; Doaré, O. ; Cadot, O. ; Chaigne, A. ; Horáček, Jaromír
the pressure and velocity fields in coronal plane along the vibrating vocal folds were studied using a finite element mathematical model. The shapes of the vocal folds were specified according to data measured on excised human larynges in phonation position. The mathematical model of the flow is based on 2D incompressible Navier-Stokes equations adapted to deal with the time-variable shape of the domain, caused by vocal fold vibration. The numerical simulations allow to observe closely various flow features related to phonation - flow separation in the glottis, Coanda effect or vortex shedding.
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