教師資料查詢 | 類別: 期刊論文 | 教師: 戴璽恆 DAI, HSI-HENG (瀏覽個人網頁)

標題:Gravity Currents Propagating on Sloping Boundaries
學年101
學期2
出版(發表)日期2013/06/01
作品名稱Gravity Currents Propagating on Sloping Boundaries
作品名稱(其他語言)
著者Dai, Albert
單位淡江大學水資源及環境工程學系
出版者Reston: American Society of Civil Engineers
著錄名稱、卷期、頁數Journal of Hydraulic Engineering 139(6), pp.593-601
摘要Three-dimensional direct numerical simulations of gravity currents on different bottom slopes are presented in this paper. After the buoyancy closed in a lock is instantaneously released, the produced gravity currents go through an acceleration phase followed by a deceleration phase. In the acceleration phase, the tail current connects to and feeds buoyancy into the head for all cases considered here. The maximum buoyancy contained in the head, reached at the end of the acceleration phase, increases as the bottom slope increases. The maximum buoyancy in the head never reaches the total released buoyancy, and a significant portion of released heavy fluid is left in the tail current. In the deceleration phase, the tail current continues to join the head as the gravity currents propagate for lower slope angles (θ=0.2, and 4°), but the head disconnects the joining tail current for higher slope angles (θ=6, 8, and 10°). The gravity current head loses contained buoyancy less rapidly in the deceleration phase as the bottom slope increases. Structures of the gravity current indicate that the relative length of the head diminishes as the gravity currents propagate downslope for lower slope angles and remains approximately constant for higher slope angles. The maximum front velocity increases as the bottom slope increases. In the deceleration phase, the front location–time relationship follows the thermal theory power law for higher slope angles and for lower slope angles, and the inertial phase power-law asymptote is observed.
關鍵字Gravity currents; Buoyancy-driven flows; Thermal theory
語言英文(美國)
ISSN0733-9429
期刊性質國外
收錄於SCI
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式紙本
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