期刊
BUILDING AND ENVIRONMENT
卷 111, 期 -, 页码 10-23出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2016.10.006
关键词
Boundary conditions; Thermal driven flows; Partially open enclosure; Restricted computational domain; Pressure adjoint methodology
资金
- National Thousand Youth Talents Program from the Organization Department of Chinese Communist Party Central Committee [208273259]
- Hunan Provincial Natural Science Foundation for Distinguished Young Scholars [14111002]
- Natural Science Foundation of China [51208192]
- NSFC [51304233]
- the Fundamental Research Funds for the Central Universities-Wuhan University [204201610136]
- Fundamental Research Funds for the Central Universities- China University of Petroleum [24720145025A]
- Shenzhen Science & Technology Department [092959179]
- the National Key Basic Research Program of China from the Ministry of Science and Technology of P.R.China [2014CB239203]
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.
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