翻译作业4
环境风对自然排烟影响的数值模拟分析对建筑火灾进行试验模拟研究非常困难，尤其是对大空间建筑的自然排烟研究，因为自然排烟方式受外界环境的影响很大。有些学者通过制作小比例模型在风洞里进行自然排烟试验并取得了一定成果，但其结果的可靠性也很难估算。随着计算机的普遍应用和计算流体力学的不断成熟，利用CFD软件对火灾过程进行数值模拟研究也越来越受到设计师的青睐，数值模拟研究是对实验研究的补充和完善，是相互促进的一个过程。本文为某剧院为实例建立几何模型和数学模型，利用计算流体力学软件Phoenics，对环境风条件下、不同通风口组合情况下的自然排烟方式进行数值模拟研究。
The numerical simulation analysis of the influence of environmental wind on natural smoke exhaust.
It is very difficult to do experimental stimulation research on building fires, especially the study of the natural smoke exhaust of large space buildings, because the means of natural smoke exhaust depends on the environment heavily. Some scholars got some success by carrying out experiments on natural exhaust smoke in wind tunnel with small scale model, but the reliability of these result still need to be evaluated. Along with the popularity of computers and the maturity of Computational Fluid Dynamics，using the CFD software to do numerical simulation research on the process of fire becomes more and more acceptable to designers andnumerical simulation research is a supplement and perfect to experimental study, as well as being a mutual promotion. In the article, the geometric model and mathematic model of a theatre, which is as the instance, are established. By using PHOENICS, the software of Computational Fluid Dynamics， numerical simulation research are carried out in different circumstances of environmental wind and in different combinations of vents。
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