本文主要利用有限元素法模擬三維空間中掛壁立方體發熱時受流體影響後的流場分布情形、溫度消散情形和影響的範圍。模擬的過程是利用三維、非穩態、紊流的方式模擬。本研究首先與Hajime Nakamura等人[6]、Alexander Yakhot等人[9]、Alexander Yakhot等人[10]、H. J. Hussein等人[11]的實驗結果比較來確定模擬的準確性,進而針對Hajime Nakamura等人[6] 的實驗來模擬雷諾數(Reynolds number)介於 4200 到 33000之間的流場,立方體和流體初始溫差為10℃,從中來探討其之間與的差異性。 分析結果中發現,不同雷諾數情況下u/u_0受到方塊的影響會比(|u|) ⃑/u_0還大;在y=0的剖面上渦度依照影響的強度大小為 ω_y>ω_z>ω_x;方塊整體表面的平均壓力係數在穩定後會維持在負值。
In this paper, the use of finite element method to fluid flow over three-dimensional a wall-mounted cube , effects flow field and heat conduction. In this study, first with Hajime Nakamura et al [6], Alexander Yakhot et al [9], Alexander Yakhot et al [10], HJ Hussein et al. [11] The experimental results to determine the accuracy of the simulation. Further according to Hajime Nakamura et al. [6] experiments to simulate Reynolds number from 4200 to 33000, cube and fluid initial temperature difference of 10 K. Explore the differences to simulation and experiments Department of Power Mechanical Engineering Found from the results, different Reynolds number u/u_0 impact will be greater than (|u|) ⃑/u_0 ; in the cross section y=0 vorticity in accordance with the size of the impact strength of ω_y>ω_z>ω_x ; The cube over all surface average pressure coefficient will remain the negative after stable.
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