Computer simulation of airflows generated by jet fans in real road tunnel by parallel version of FDS 6

IF 1.1 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Ventilation Pub Date : 2021-01-02 DOI:10.1080/14733315.2019.1698164

P. Weisenpacher, L. Valásek

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引用次数: 5

Abstract

Abstract In this paper the FDS 6 code ability to simulate the airflows generated by jet fans in a real road tunnel is studied. A transient model of the 898 m long bi-directional highway Polana tunnel is created including details of the tunnel geometry as emergency lay-bys and traffic signs. The absolute roughness of the tunnel walls of 70 mm is determined to represent the influence of curved tunnel geometry and tunnel equipment not explicitly modelled on the tunnel airflows and their retardation. The simulations results are compared against on-site measurements during a full-scale ventilation test conducted in the Polana tunnel in 2017. The comparison includes steady-state bulk airflow velocity and velocity profile investigated by a grid of five anemometers. The simulations results are in good accordance with experimental data with relative errors below 2% for bulk velocities and typically below 9% for velocities measured by particular grid anemometers. Specific circumstances where errors exceed the latter value are discussed. The influence of unknown external dynamic pressure fluctuations on the simulation results is also analysed. Optimal settings for parallel computations are determined from the point of view of simulation accuracy and performance. The model is intended for purposes of tunnel fires modelling.

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利用fds6并行版软件对真实公路隧道中射流风机产生的气流进行了计算机模拟

摘要:本文研究了fds6程序在实际公路隧道中模拟喷气扇气流的能力。一个898米长的双向公路Polana隧道的瞬态模型被创建，包括隧道几何形状的细节，如紧急停车处和交通标志。隧道壁的绝对粗糙度为70 mm，以表示弯曲的隧道几何形状和未明确建模的隧道设备对隧道气流及其延迟的影响。模拟结果与2017年在Polana隧道进行的全尺寸通风测试的现场测量结果进行了比较。比较包括稳态大气流速度和五个风速计网格上的速度分布。模拟结果与实验数据吻合较好，总体速度的相对误差小于2%，特定栅格风速测量速度的相对误差通常小于9%。讨论了误差超过后一个值的具体情况。分析了未知外部动压力波动对仿真结果的影响。从仿真精度和性能的角度确定了并行计算的最佳设置。本模型适用于隧道火灾建模。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Ventilation CONSTRUCTION & BUILDING TECHNOLOGY-ENERGY & FUELS

CiteScore

3.50

自引率

6.70%

发文量

审稿时长

>12 weeks

期刊介绍： This is a peer reviewed journal aimed at providing the latest information on research and application. Topics include: • New ideas concerned with the development or application of ventilation; • Validated case studies demonstrating the performance of ventilation strategies; • Information on needs and solutions for specific building types including: offices, dwellings, schools, hospitals, parking garages, urban buildings and recreational buildings etc; • Developments in numerical methods; • Measurement techniques; • Related issues in which the impact of ventilation plays an important role (e.g. the interaction of ventilation with air quality, health and comfort); • Energy issues related to ventilation (e.g. low energy systems, ventilation heating and cooling loss); • Driving forces (weather data, fan performance etc).