Free vent boundary conditions for thermal buoyancy driven laminar flows inside open building enclosures

Zhang Ji-Hao; Zhang Dong-Dong; Liu Di; Zhao Fu-Yun; Li Yuguo; Wang Han-Qing

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Free vent boundary conditions for thermal buoyancy driven laminar flows inside open building enclosures

机译：在开放式建筑围护结构内，由热浮力驱动的层流的自由排气边界条件

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A comprehensive investigation and review about the free vent boundary conditions are conducted regarding of natural convections inside an open cavity with one side horizontal opening, aiming to abandon the extended computational domain through imposing suitable pressure and momentum boundary conditions on the free ventilated ports. The main differences among Type A, Type C and Type D BCs are the definitions and assumptions on the free port boundary pressures. The physical governing equations for the present investigation are solved numerically for a wide range of thermal Rayleigh number and enclosure aspect ratio to identify the applicability of the four categories of free port boundary conditions. The simulation results show that, with the flow intensity increasing in the region near free opening, Type D BCs, Type C BCs and Type A BCs would take turns being the most effective and suitable BCs to achieve the flow solutions approaching to the reference ones. Regarding of the computational stability, authors-proposed free vent port boundary conditions (Type D BCs) achieve the best performance. In addition, it is found that enclosure ventilation rate is a more suitable and convincing criterion than heat transfer rate to validate the accuracy of the numerical methods. (C) 2016 Elsevier Ltd. All rights reserved.

机译：对具有一侧水平开口的开放腔内自然对流的自由通风边界条件进行了全面的研究和回顾，旨在通过在自由通风端口上施加适当的压力和动量边界条件来放弃扩展的计算域。 A型，C型和D型BC之间的主要区别在于自由口边界压力的定义和假设。在广泛的热瑞利数和围护结构纵横比范围内，对本研究的物理控制方程进行了数值求解，以确定四类自由港边界条件的适用性。仿真结果表明，随着自由开孔附近区域水流强度的增加，D型BC，C型BC和A型BC将轮流成为最有效，最合适的BC，以实现接近参考值的流量解。关于计算稳定性，作者提出的自由排气口边界条件（D BC型）达到了最佳性能。此外，已发现，与通风率相比，外壳通风率是更合适和更有说服力的标准，以验证数值方法的准确性。（C）2016 Elsevier Ltd.保留所有权利。

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来源
《Building and Environment》 |2017年第1期|10-23|共14页
作者
Zhang Ji-Hao; Zhang Dong-Dong; Liu Di; Zhao Fu-Yun; Li Yuguo; Wang Han-Qing;
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作者单位

Wuhan Univ, Sch Power & Mech Engn, Room B9403,Dong Hu Southern Rd, Wuhan 430072, Hubei Prov, Peoples R China;

Wuhan Univ, Sch Power & Mech Engn, Room B9403,Dong Hu Southern Rd, Wuhan 430072, Hubei Prov, Peoples R China;

China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China;

Wuhan Univ, Sch Power & Mech Engn, Room B9403,Dong Hu Southern Rd, Wuhan 430072, Hubei Prov, Peoples R China|Hunan Univ Technol, Sch Civil Engn, Zhuzhou, Hunan, Peoples R China;

Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China;

Hunan Univ Technol, Sch Civil Engn, Zhuzhou, Hunan, Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类
关键词
Boundary conditions; Thermal driven flows; Partially open enclosure; Restricted computational domain; Pressure adjoint methodology;

机译：边界条件;热驱动流;部分开放的外壳;有限的计算域;压力伴随方法;

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3. Thermal and entropy analyses on buoyancy-driven flow of nanofluid inside a porous enclosure with two square cylinders: Finite element method [J] . A. Sattar Dogonchi, S.R. Mishra, Ali J. Chamkha, Case Studies in Thermal Engineering . 2020,第a期

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Free vent boundary conditions for thermal buoyancy driven laminar flows inside open building enclosures

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