Application of Flow-3D on flow field and scour simulation around a bridge pile
| Autor: | Chia-ChiLiu, 劉家齊 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 Taiwan is periodically disturbed by typhoon storms that usually characterize high intensity and long duration, causing different types of hydrograph in river channels influencing the characteristics of scours around bridge piers. This study used a three-dimensional fluid dynamics model (i.e., FLOW-3D) to simulate the characteristics of scouring around the bridge piers involved in various hydrographs. As a result, the scour modeling around the bridge pier shows that the magnitude of discharge peaks and the amount of water discharges, respectively, control scour depth based on the same amount of water discharges and the same scouring duration. Moreover, the high double peaks cause 50% of total scour depth at each peak but the low double peaks generate significant scour depth only at the second peak. Moreover, based on the same simulation period (200s) and total water volume (1.28 m3), this study also simulated riverbed scouring affected by single, double and quadruple flood waves. Results indicate that the more the number of flood waves, the greater the scour depth; Moreover, quadruple flood waves lead to a factor of 1.35 increase in final scour depth under single flood wave; riverbed scouring always concentrates on the rising limbs for single or multiple flood waves. In addition, the forth flood wave of quadruple flood waves shows an evident sediment refill process (about 17%) on riverbed. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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