A numerical simulation of cavitating flow due to closure of a mechanical heart valve
| Autor: | Chen-Kuo Huang, 黃振國 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Cavitation was first related to valves of a mechanical heart in the 1980s after a series of valve fractures of a particular valve were observed. In the present study, the cavitating flow phenomena are computationally studied with the assumption that the valve motion is known. We focus on the effects of closing velocity of the valve on the flow development since it is known that cavitation often occurs at the moments when the valve is closing due to the fact that at these moments, the local flow often accelerates and a local high velocity distribution results. In the present series of computations, a viscous flow model is incorporated with a dynamic mesh strategy to cope with the movement of the valve. Furthermore, the simulation of cavitation will be modeled by the “full cavitation model,” which takes considerations of the first-order effect of the formation and transport of vapor bubbles, the turbulent fluctuations of pressure and velocity, and the magnitude of non-condensable gases. In addition, we also assume that the liquid phase is incompressible, and all parameters and physical variables are independent of temperature. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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