The Influence of Source Froude Number and Turbulent Fluctuations on the Development of Turbulent Fountains in Stratified Ambient

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2024-02-06 DOI:10.1007/s10494-024-00528-4

Luis G. Sarasúa, Daniel Freire Caporale, Nicasio Barrere, Arturo C. Marti

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Abstract

Turbulent fountains are widespread natural phenomena with numerous industrial applications. Extensive research has focused on the temporal evolution and maximum height of these fountains, as well as their dependence on Reynolds and Froude numbers. However, the lower boundary of the spreading flow attained by the mixture of the ejected fluid and the surrounding ambient fluid has received little attention. Here, we focus on the dependence of the lower boundary height on the characteristics of the fountain and demonstrate how to control it. Large Eddy simulations were carried out based on a Navier–Stokes solver which implements fully implicit 3D incompressible finite volume method with second-order accuracy in space and time using curvilinear coordinates, and validated with laboratory experiments. Our results present important implications for technological applications of turbulent fountains, particularly in protecting crops from frost. We discuss the potential of our results to improve the efficiency of such applications.

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源弗劳德数和湍流波动对分层环境中湍流喷泉发展的影响

湍流喷泉是一种广泛存在的自然现象，在工业领域应用广泛。大量研究集中于这些喷泉的时间演变和最大高度，以及它们与雷诺数和弗劳德数的关系。然而，喷射流体与周围环境流体的混合物所形成的扩散流的下边界却很少受到关注。在此，我们将重点关注下边界高度与喷泉特性的关系，并演示如何对其进行控制。我们基于纳维-斯托克斯求解器进行了大涡流模拟，该求解器使用曲线坐标实现了空间和时间二阶精度的全隐式三维不可压缩有限体积法，并通过实验室实验进行了验证。我们的研究结果对湍流喷泉的技术应用具有重要意义，特别是在保护农作物免受霜冻方面。我们讨论了我们的结果在提高此类应用效率方面的潜力。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.