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Dynamic thermal CFD simulation of a typical office by efficient transient solution methods

机译：通过有效的瞬态求解方法对典型办公室进行动态热CFD模拟

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摘要

This paper describes the evolution and application of an efficient dynamic thermal modelling (DTM) procedure, developed within computational fluid dynamics (CFD). The results of a case study to simulate the dynamic thermal conditions within a typical office space using the novel DTM-CFD procedure are reported. The main area of investigation was the ability to account for the time-varying thermal response of building fabrics to internal and external ambient conditions and the consequential effect on the air inside the enclosure. The proposed DTM-CFD procedure utilised a transient time-varying grid schedule, 'Freeze-Flow' and 'Boundary Freeze' techniques. 'Freeze Flow' paused the solution of all governing equations of fluid flow, except temperature; while 'Boundary Freeze' froze temperatures at boundaries of the CFD model whilst solving all equations in the flow domain. The DTM-CFD procedure provides the potential for solving the problem of generating large quantities of data, whilst effectively and accurately modelling heat transfer through the building fabric and internal air simultaneously using CFD alone. An assessment of the performance of the DTM-CFD procedure was made through inter-model comparisons with fully transient CFD solutions. The procedure was successful in providing more detailed dynamic thermal simulations than would have otherwise been obtainable from a DTM and more efficiently (simulation time) than a CFD model.
机译：本文介绍了在计算流体动力学（CFD）中开发的高效动态热建模（DTM）程序的演变和应用。报告了使用新型DTM-CFD程序模拟典型办公空间内动态热条件的案例研究结果。研究的主要领域是考虑建筑织物对内部和外部环境条件的时变热响应的能力，以及对机柜内部空气的间接影响。提出的DTM-CFD程序利用了瞬态时变网格调度，“冻结流”和“边界冻结”技术。 “冻结流量”暂停了除温度以外的所有流体流量控制方程的求解；而“边界冻结”冻结CFD模型边界的温度，同时求解流域中的所有方程。 DTM-CFD程序为解决生成大量数据的问题提供了潜力，而仅使用CFD即可同时有效，准确地模拟通过建筑结构和内部空气的热传递。通过与全瞬态CFD解决方案进行模型间比较，对DTM-CFD程序的性能进行了评估。该程序成功地提供了比DTM更为详尽的动态热模拟，并且比CFD模型更有效（模拟时间）。

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