基于CFD/FEM耦合的耐火试验数值模拟和烟气泄漏预测

IF 0.9 Q4 CONSTRUCTION & BUILDING TECHNOLOGY
R. Prieler, Simon Pletzer, Stefan Thusmer, G. Schwabegger, C. Hochenauer
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引用次数: 0

摘要

目的在建筑材料的耐火试验中,通过试验程序的一个关键标准是避免由于热暴露而产生的间隙和裂缝导致的热烟气泄漏。本研究的目的是计算嵌入砖墙内的钢门的变形,并定性地确定烟气泄漏。设计/方法/方法引入了计算流体力学/有限元法(CFD/FEM)耦合,代表了单向和全双向耦合方法之间的中间方法,从而产生了简化的双向耦合(STWC)。与完全双向耦合相比,基于单向方法模拟了通过钢门的传热。随后,在接下来的CFD/FEM模拟中使用了单向模拟中预测的门处温度,其中同时计算了炉内外的流体流动以及门的变形。结果模拟结果表明,门锁上方和门的上边缘存在较大的缝隙和烟气泄漏,与实验结果非常吻合。此外,研究发现,与单向耦合相比,STWC预测了类似的变形。原创性/价值由于火灾研究中流体/结构相互作用的双向耦合方法在计算上要求很高,因此研究数量很少。只有少数人在处理因固体成分破坏而从房间排出的烟气。因此,本研究是第一个处理由于间隙形成而导致的烟气泄漏的双向方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical simulation of a fire resistance test and prediction of the flue gas leakage using CFD/FEM coupling
PurposeIn fire resistance tests (FRTs) of building materials, a crucial criterion to pass the test procedure is to avoid the leakage of the hot flue gases caused by gaps and cracks occurring due to the thermal exposure. The present study's aim is to calculate the deformation of a steel door, which is embedded within a wall made of bricks, and qualitatively determine the flue gas leakage.Design/methodology/approachA computational fluid dynamics/finite element method (CFD/FEM) coupling was introduced representing an intermediate approach between a one-way and a full two-way coupling methodology, leading to a simplified two-way coupling (STWC). In contrast to a full two way-coupling, the heat transfer through the steel door was simulated based on a one-way approach. Subsequently, the predicted temperatures at the door from the one-way simulation were used in the following CFD/FEM simulation, where the fluid flow inside and outside the furnace as well as the deformation of the door were calculated simultaneously.FindingsThe simulation showed large gaps and flue gas leakage above the door lock and at the upper edge of the door, which was in close accordance to the experiment. Furthermore, it was found that STWC predicted similar deformations compared to the one-way coupling.Originality/valueSince two-way coupling approaches for fluid/structure interaction in fire research are computationally demanding, the number of studies is low. Only a few are dealing with the flue gas exit from rooms due to destruction of solid components. Thus, the present study is the first two-way approach dealing with flue gas leakage due to gap formation.
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来源期刊
Journal of Structural Fire Engineering
Journal of Structural Fire Engineering CONSTRUCTION & BUILDING TECHNOLOGY-
CiteScore
2.20
自引率
10.00%
发文量
28
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