Calculation and design of tunnel ventilation systems using a two- scale modelling Approach
Calculation and design of tunnel ventilation systems using a two- scale modelling Approach
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DOI：
10.1016/j.buildenv.2009.03.020
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发表时间：
2009-12
影响因子：
7.4
通讯作者：
F. Colella;G. Rein;R. Borchiellini;R. Carvel;J. Torero;V. Verda
中科院分区：
文献类型：
--
作者：
F. Colella;G. Rein;R. Borchiellini;R. Carvel;J. Torero;V. Verda
本文提出了一种新的环境条件(即冷流)下隧道通风流动的模拟方法。通过有效地将简单的一维方法与详细的CFD解决方案相结合，从而避免了隧道内流动的完整CFD模型的复杂性或简化假设的不准确性，在隧道区域中，流动完全发育，而详细的CFD解决方案中的流动条件需要3D分辨率。这种多尺度方法以前没有被应用于隧道流。当需要研究数百种可能的通风方案时，这种方法的计算成本很低，具有很大的价值。多尺度方法能够在需要的情况下提供详细的局部流动条件，同时显著减少了总的计算时间。研究和讨论了这种新方法的耦合过程和引起的数值误差。本文描述了数值结果与实际隧道中记录的实验数据的比较，强调了所开发的方法如何可以作为任何隧道通风系统的有效设计工具。这项工作为火灾诱导的流动和通风系统的耦合奠定了基础，在这些系统中，热气体羽流和烟雾分层引入了进一步的复杂性。
This paper develops a novel modelling approach for ventilation flow in tunnels at ambient conditions (i.e. cold flow). The complexity of full CFD models of flow in tunnels or the inaccuracies of simplistic assumptions are avoided by efficiently combining a simple, mono-dimensional approach to model tunnel regions where the flow is fully developed, with detailed CFD solutions where flow conditions require 3D resolution. This multi-scale method has not previously been applied to tunnel flows. The low computational cost of this method is of great value when hundreds of possible ventilation scenarios need to be studied. The multi-scale approach is able to provide detailed local flow conditions, where required, with a significant reduction in the overall computational time. The coupling procedures and the numerical error induced by this new approach are studied and discussed. The paper describes a comparison between numerical results and experimental data recorded within a real tunnel underlining how the developed methodology can be used as a valid design tool for any tunnel ventilation system. This work sets the foundations for the coupling of fire-induced flows and ventilation systems where further complexities are introduced by the hot gas plume and smoke stratification.