本研究旨在利用ANSYS CFX軟體來進行門牆構件體耐火試驗爐之內部流場以及以試驗爐加熱之防火門受熱後溫度變化的數值模擬，以建立可與實驗比對並提供可靠參考的結果。內容主要探討加溫過程中爐內氣體之壓力、均溫性等，並在考慮傳導、對流、熱輻射效應之情形下，防火門加熱後非受熱面之溫度變化。
在程式驗證部分，則選取了幾個例子，如三維空穴流、三維自然對流等，並與文獻來做比對，以驗證ANSYS CFX在流體對流及熱傳遞性上之準確性與可靠性。
本研究實際的物理模型是以國立成功大學防火安全研究中心所提供的試驗爐來建立，其尺寸是3.0m(面寬)*3.1m(高度)*1.05m(深度)，而防火門尺寸是1170mm(門樘寬度)×2100mm(門樘高度)×64mm(門扇厚度)。最後將以上之模型之數值模擬結果與實驗數據做一比對。
分析模擬結果可以發現試驗爐內的溫度與壓力均符合法規，且與實驗數據相去不遠，也發現均溫性與氣流之流向有很大的關係。而在門體部分，最後模擬結果也很接近實驗數據。

This paper uses Ansys CFX to analyze the flow field in a fire-resisitence furnace and the heat transfer for a fire door. One can numerically compute the air temperature and pressure in the furnace, investigate the temperature distribustion on the unexposed side of a fire door.
First,two cases are tested to verify the reliability and accuracy of CFX . These two problems are three-dimensional cavity flow and three-dimensional natural convection. The results are compared well with the known data .Second,the fire-resistence testing furnace model is (width)3.0m x (height)3.1m x (depth)1.05m , the furance injects the high temperature gas from the inlet according to a elevated temperature curve, then the temperature distribution and pressure distribution in the furnace are simulated.The numerical results are compared well with the experimental data.
Finally,The fire door chosen is (width) 1170mm x (height) 2100mm x (thickness) 64mm , after two hours of simulation , the temperature distribution on the unexposed side are computed

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