Numerical solution of three-dimensional rectangular submerged jets with the evidence of the undisturbed region of flow
Numerical solution of three-dimensional rectangular submerged jets with the evidence of the undisturbed region of flow
复制标题
三维矩形浸没射流数值解及其流动原状区域的证据
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
F. Gori
中科院分区：
文献类型：
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作者：
M. Angelino;A. Boghi;F. Gori
本文采用二维数值模拟方法和大涡模拟方法，在不同雷诺数下，对矩形自由射流的演化过程进行了数值研究。平均数值结果证实了位于狭缝出口和潜在核心区（PCR）的开始之间的未受干扰的流动区域（URF）的存在，之前在罗马大学“Tor Vergata”由Gori及其同事进行了实验观察。本文作者在文献中所研究的条件下进行了二维研究，表明了URF具有自相似行为，并提出了一个新的动量演化规律。本文将大涡模拟扩展到Re = 5000 ~ 40000范围内的三维矩形淹没自由射流，表明URF的自相似行为在三维数值模拟、PCR和充分发展区（FDR）中同样存在。
ABSTRACT The evolution of turbulent rectangular submerged free jets has been investigated numerically with a two-dimensional (2D) approach by the present authors and, by using the large eddy simulations (LES) at several Reynolds numbers. The average numerical results confirmed the presence of the undisturbed region of flow (URF) located between the slot exit and the beginning of the potential core region (PCR) previously observed experimentally at the University of Rome “Tor Vergata” by Gori and coworkers. The 2D study of the present authors carried out under the conditions previously investigated in the literature, showed that the URF has a self-similar behavior, and proposed a new law for the evolution of the momentum. The present paper extends the LES to three-dimensional (3D) rectangular submerged free jets, in the range from Re = 5,000 to Re = 40,000, showing that the self-similar behavior of URF is also present in the 3D numerical simulations, as well as in the PCR and in the fully developed region (FDR).