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 from Instantaneous Sources Down a Slope
學年100
學期1
出版(發表)日期2012/01/01
作品名稱Gravity Currents from Instantaneous Sources Down a Slope
作品名稱(其他語言)
著者Dai, Hsi-Heng; Ozdemir, C. E.; Cantero, M. I.; Balachandar, S.
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 138(3), pp.237–246
摘要Gravity currents from instantaneous sources down a slope were modeled with classic thermal theory, which has formed the basis for many subsequent studies. Considering entrainment of ambient fluid and conservation of total buoyancy, thermal theory predicted the height, length, and velocity of the gravity current head. In this study, the problem with direct numerical simulations was re-investigated, and the results compared with thermal theory. The predictions based on thermal theory are shown to be appropriate only for the acceleration phase, not for the entire gravity current motion. In particular, for the current head forms on a 10° slope produced from an instantaneous buoyancy source, the contained buoyancy in the head is approximately 58% of the total buoyancy at most and is not conserved during the motion as assumed in thermal theory. In the deceleration phase, the height and aspect ratio of the head and the buoyancy contained within it may all decrease with downslope distance. Thermal theory relies on the increase in the mass of the current head through entrainment as the major mechanism for deceleration and, therefore, tends to underpredict the front velocity in the deceleration phase.
關鍵字Buoyancy-driven flows; Gravity currents; Sloping boundary; Thermal theory
語言英文
ISSN0733-9429; 1943-7900
期刊性質國外
收錄於
產學合作
通訊作者Dai, Hsi-Heng
審稿制度
國別美國
公開徵稿
出版型式紙本
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