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The simplification of computer simulated persons (CSPs) in CFD models of occupied indoor spaces

机译：简化室内空间CFD模型中的计算机模拟人员（CSP）

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This study presented an iterative approach to simplify computer simulated persons (CSPs) based on the mesh decimating algorithm [1]. The approach could largely simplify 3D-scanned manikins while maintaining their key geometrical features. The level of simplification could be quantified through controlling the iteration number of simplification. CFD computations of human thermal plume in a quiescent room were performed using CSPs with different levels of simplification. The numerical results were compared against the experimental data available in the literature. The results demonstrated that within the scope of this study, the CSP simplification only affected the predicted airflow field in the thermally-affected regions where the normalized air velocity was larger than 0.5. The predictive error increased with the dimensionless simplification index (SI). When SI was less than 3.5 x 10(-4), the error induced by CSP simplification could be safely ignored. Contaminant transport in a densely occupied airliner cabin section was also simulated using the simplified CSPs. The results revealed that although the CSP simplification only affected airflow field prediction of the thermal plume regions, it could enlarge the predictive error of contaminant transport in the whole computational domain. In addition, this study found that the CSPs yielded from the algorithm were more numerically stable in terms of CFD computations. (C) 2015 Elsevier Ltd. All rights reserved.
机译：这项研究提出了一种基于网格抽取算法的简化计算机模拟人（CSP）的迭代方法[1]。该方法可以在很大程度上简化3D扫描人体模型，同时保持其关键的几何特征。可以通过控制简化的迭代次数来量化简化的级别。使用具有不同简化级别的CSP对静态房间中的人为热羽进行CFD计算。将数值结果与文献中提供的实验数据进行了比较。结果表明，在本研究范围内，CSP的简化仅影响归一化风速大于0.5的热影响区域中的预测气流场。预测误差随着无量纲简化指数（SI）的增加而增加。当SI小于3.5 x 10（-4）时，可以安全地忽略CSP简化引起的误差。还使用简化的CSP模拟了在客舱密集区域中的污染物运输。结果表明，尽管CSP简化仅影响热羽流区域的气流场预测，但它可能会在整个计算域中扩大污染物传输的预测误差。此外，这项研究还发现，从算法中得出的CSP在CFD计算方面在数值上更稳定。 （C）2015 Elsevier Ltd.保留所有权利。

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