THREE-DIMENSIONAL NUMERICAL ANALYSIS OF TSUNAMI RUNUP-INDUCED LOCAL SCOURING AROUND A CYLINDER
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- KAJIKAWA Yuki
- 鳥取大学 学術研究院工学系部門
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- TAKEDA Masahide
- 東亜建設工業株式会社 技術研究開発センター
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- KUROIWA Masamitsu
- 鳥取大学 学術研究院工学系部門
Bibliographic Information
- Other Title
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- 遡上津波による円柱周辺の局所洗掘現象に関する三次元数値解析
- ソジョウ ツナミ ニ ヨル エンチュウ シュウヘン ノ キョクショ センクツ ゲンショウ ニ カンスル サンジゲン スウチ カイセキ
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Abstract
<p> In this paper, the authors proposed a numerical model of three-dimensional (3D) flow and topography change in order to predict a tsunami runup-induced local scouring around a cylinder with high accuracy. In the proposed model, the 3D RANS equations with the RNG k-ε turbulent model into which the FAVOR method introduced was used for tsunami calculation. For topography change, non-equilibrium bed load and suspended load were considered. The model was applied to a large scale laboratory experiment conducted by Tonkin et al. (2003). By comparisons between calculated and experimental data, the model was found to reproduce the time variation of water level and local scour depth in both front and side of the cylinder accurately. However, the local scour behind the cylinder could not be reproduced. It was suggested that introducing the flying up of bed load to the model is necessary in order to predict the local scour accurately.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76 (2), I_487-I_492, 2020
Japan Society of Civil Engineers