Merging jets in a coflowing ambient fluid - a hybrid approach
作者:
K.L. Pun,
M.J. Davidson,
H.J. Wang,
期刊:
Journal of Hydraulic Research
(Taylor Available online 2000)
卷期:
Volume 38,
issue 2
页码: 105-114
ISSN:0022-1686
年代: 2000
DOI:10.1080/00221686.2000.10525035
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A multiple-point hybrid model for predicting the behavior of merging jets in a coflowing ambient fluid is presented. The hybrid model combines themodular structure of a length-scale model with the reduced empiricism of an Eulerian-integral model. Integral models of merging behavior are cumbersomebecause of the need to sum the momentum of individual jets during the merging process. A length-scale approach simplifies the model significantly,but details of the merging process are lost. A significant limitation of length-scale models is the assumption that the transition between flowregimes occurs at a single point. This difficulty can be overcome by allowing the transition to occur in stages and this leads to the use of the multiplepointapproach. Predictions from the multiple-point hybrid model are compared with an equivalent single-point hybrid model and an Eulerian-integralsolution for the same problem. The multiple-point approach significantly reduces transition errors when compared to the single-point model. These transitionerrors can result in inaccurate predictions of merging behaviour. Predictions from the multiple-point hybrid model are in good agreement with theintegral solution.
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