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Evaluation of errors on the CFD computation of air flow and heat transfer around the human body

机译：CFD计算人体周围空气流动和传热的误差的评估

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摘要

A detailed computer aided design model representing a female human body was created from a 3-D scan of a full scale thermal manikin. The sensible heat losses due to convection and radiation for a person seated in a rectangular room were calculated using CFD simulations, as well as the parameters characterizing the flow around the body including air velocity and temperature. The accuracy of numerical results was evaluated in terms of the physical approximation errors, namely inlet boundary conditions and turbulence models, and spatial discretization errors due to the number of grid elements and grid refinement near solid surfaces. Results were compared to published data from two tests performed in conditions that portrayed the CFD simulations. The use of: a mixed turbulence model between k-ε, for zones away from solid surfaces, and k-ω, for zones close to solid surfaces; values of the dimensionless y~+ parameter inferior to 5 jointly with a low-Reynolds method to model the flow in the near-wall region of the human surface and inlet non-uniform boundary profiles for temperature, velocity and turbulence intensity, leaded to good agreement with experimental results, with a global mean relative error of the order of 7%, with a standard deviation of 4%, in terms of convective and radiative heat flux between the human body and the thermal environment.
机译：通过对全尺寸人体模型的3D扫描，创建了代表女性人体的详细计算机辅助设计模型。使用CFD模拟以及代表身体周围气流的参数（包括空气速度和温度），计算了坐在矩形房间中的人因对流和辐射而产生的显热损失。根据物理近似误差（即入口边界条件和湍流模型）以及由于网格元素数量和靠近固体表面的网格细化导致的空间离散误差，评估了数值结果的准确性。将结果与在描述CFD模拟的条件下进行的两次测试的发布数据进行了比较。使用以下混合湍流模型：对于远离固体表面的区域，k-ε之间；对于靠近固体表面的区域，k-ω之间；无量纲y〜+参数的值小于5，并采用低雷诺方法来模拟人表面近壁区域中的流动以及入口的温度，速度和湍流强度的非均匀边界轮廓，从而获得了良好的结果就人体与热环境之间的对流和辐射热通量而言，与实验结果一致，整体平均相对误差约为7％，标准偏差为4％。

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  • 来源
    《Building and Environment》 |2012年第12期|p.58-69|共12页
  • 作者

    N. Martinho; A. Lopes; M. Gameiro da Silva;

  • 作者单位

    Department of Mechanical Engineering, Polytechnic Institute of Leiria, Mono do Lena, Alto Vieiro, 2401-951 Leiria, Portugal, ADAl-LAETA, Department of Mechanical Engineering, University of Coimbra - Polo II, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal;

    ADAl-LAETA, Department of Mechanical Engineering, University of Coimbra - Polo II, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal;

    ADAl-LAETA, Department of Mechanical Engineering, University of Coimbra - Polo II, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    computer simulated person; thermal manikins; radiation; convection; CFD; benchmark tests;

    机译：计算机模拟的人;人体模型;辐射;对流;差价合约基准测试;

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