Development and Applications of Mesh Exchanging with Unstructured Spectral Element Method for Two-dimensional Incompressible Flow
碩士 === 國立臺灣大學 === 機械工程學研究所 === 96 === A mesh changing algorithm for unstructured spectral element method has been developed for moving boundary problems which usually suffer from large mesh distortions . The main purpose of mesh changing is to ensure the quality of mesh and to keep the accuracy of c...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/53613259447212765597 |
| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 96 === A mesh changing algorithm for unstructured spectral element method has been developed for moving boundary problems which usually suffer from large mesh distortions . The main purpose of mesh changing is to ensure the quality of mesh and to keep the accuracy of computation as high as possible when large distortion of mesh occurs. This algorithm was further applied to the study of the phenomena of flow around two side-by-side cylinders with large amplitude of vibration. Incompressible Navier-Stokes equations were solved with ALE dynamics description and Reynolds number of all simulations is 160. Effects of gap and phase difference of vibration between two cylinders were studied. It is found that lock-in area decreases when amplitude of two out-phase(180°) cylinders is higher than 0.7 diameter. And it is also found that there exists limitation of vibration amplitude because lock-in phenomena does not occur any more when amplitude of two out-phase(180°) cylinders is higher than 0.9 diameter.
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