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首页> 外文期刊>Journal of Hazardous Materials >Mitigation of dense gas releases within buildings: validation of CFD modelling
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Mitigation of dense gas releases within buildings: validation of CFD modelling

机译：减少建筑物内的浓密气体释放：CFD模型验证

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摘要

When an accidental release of a hazardous material is considered within a safety case or risk assessment, its off-site effects are generally assessed by calculating the dispersion of vapour from the site. Although most installations handling flammable materials will be in the open air, many types of plant, particularly those handling toxics, are enclosed, partly to provide some form of containment and hence, to mitigate the effects of any release. When such a release occurs within a building, the gas or vapour will undergo some mixing before emerging from any opening. The degree of mixing will depend upon the building geometry and the nature of the ventilation, which in turn may be modified by the leak. This situation is considered in this paper, with specific application to calculating the rate of release of a dense vapour from a building. The paper describes the application of computational fluid dynamics (CFD) techniques to modelling the release and mixing processes within buildings. Examples of validation calculations for simple geometric arrangements, as well as more complex geometries representative of an industrial site, are described. The results demonstrate the capabilities of CFD for this application but highlight the need for careful modelling of the near-wall flows and heat transfer, and need for an accurate fluid dynamics and thermodynamic representation of the release source.
机译：当在安全案例或风险评估中考虑了有害物质的意外释放时，通常通过计算来自现场的蒸气扩散来评估其场外影响。尽管大多数处理易燃材料的设施都将在露天环境中，但许多类型的工厂（尤其是处理有毒物质的工厂）被封闭起来，部分是为了提供某种形式的密封，从而减轻任何释放的影响。当建筑物内发生这种释放时，气体或蒸气将经过某种混合，然后再从任何开口中出来。混合程度将取决于建筑物的几何形状和通风的性质，而通风情况又可能因泄漏而改变。本文考虑了这种情况，并将其具体应用于计算建筑物中浓蒸气的释放速率。本文介绍了计算流体动力学（CFD）技术在建筑物内部释放和混合过程建模中的应用。描述了用于简单几何布置以及代表工业现场的更复杂几何形状的验证计算的示例。结果证明了CFD在该应用中的功能，但强调了对近壁流动和传热进行仔细建模的需求，以及对释放源的精确流体动力学和热力学表示的需求。

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