本文在正方形密閉容器中置入一個可旋轉、厚度為零的剛性平板，研究其對混合熱對流的影響。本研究使用NAPPLE法則與隱式虛擬邊界法做數值模擬，並且妥善處理鬼點的溫度計算。本研究中流體為空氣，Re數為430，Pr數為0.71，板長d分別為0.6與0.9兩種情形，Ra數範圍為(10)^4~(10)^6。結果顯示當板長d=0.6、Ra數大於0.55×(10)^6時，Nu數將隨時間產生震盪的情形。且在d=0.6、Ra數小於0.13×(10)^6時，旋轉平板會幫助熱傳，而Ra數大於0.13×(10)^6時，旋轉平板則會阻礙熱傳。當d=0.9時，Nu數的反應頻率為兩倍平板的旋轉頻率。

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