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On the effect of turbulent intensity towards the accuracy of the zero-equation turbulence model for indoor airflow application

机译：湍流强度对室内气流零方程湍流模型精度的影响

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摘要

The zero-equation turbulence model for indoor airflow applications proposed by Chen and Xu [4] has obtained immense popularity amongst the CFD practitioners in HVAC industry. A uniform turbulent intensity of 10% has been assumed in their model. In this paper, following the analogy of Chen and Xu [4] in deriving the coefficient of their zero-equation turbulence model (0.03874) which is indeed expressed as a function of turbulent intensity, the effect of turbulent intensity value assumed in the model towards the solution accuracy is investigated in this paper. Three indoor airflow cases, i.e. forced convection, natural convection and mixed convection problems are studied. It has been discovered that as the assumed uniform turbulent intensity T; is reduced, the solution accuracy is significantly improved and the prediction comes closer to those of the two-equation standard k-e model, LES model as well as the experimental data.
机译：由Chen和Xu [4]提出的用于室内气流应用的零方程湍流模型在HVAC行业的CFD从业者中获得了极大的欢迎。他们的模型假设湍流强度为10％。在本文中，按照Chen和Xu [4]的类比，推导其零等值湍流模型的系数（0.03874）实际上表示为湍流强度的函数，该模型中假定的湍流强度值对本文研究了求解精度。研究了三种室内气流情况，即强制对流，自然对流和混合对流问题。已经发现，作为假定的均匀湍流强度T;降低了求解精度，大大提高了求解精度，并且预测更加接近于两方程式标准k-e模型，LES模型以及实验数据。

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  • 来源
    《Building and Environment》 |2011年第1期|p.82-88|共7页
  • 作者

    K.C. Ng; M.A. Abdul Aziz; E.Y.K. Ng;

  • 作者单位

    Department of Research and Applications, O.Y.L R&D Center, Lot 4739, Jalan BRP 8/2, Taman Bukit Rahman Putra, 47000 Sungai Buioh, Selangor Darul Ehsan, Malaysia;

    rnDepartment of Research and Applications, O.Y.L R&D Center, Lot 4739, Jalan BRP 8/2, Taman Bukit Rahman Putra, 47000 Sungai Buioh, Selangor Darul Ehsan, Malaysia;

    rnSchool of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    indoor airflow; zero-equation turbulence model; CFD; HVAC;

    机译：室内气流;零方程湍流模型;差价合约暖通空调;

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