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研究生:邱處祥
研究生(外文):Chu-ShiangChiou
論文名稱:晶格波茲曼法結合大渦模型模擬暫態衝擊噴流問題
論文名稱(外文):Transient Impinging Jet Flow Simulation Using Lattice Boltzmann Method and Combined Large-Eddy Model
指導教授:楊玉姿楊玉姿引用關係
指導教授(外文):Yue-Tzu Yang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:機械工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:87
中文關鍵詞:晶格波茲曼法流函數-渦度法紊流大渦模擬衝擊噴流數值模擬
外文關鍵詞:Lattice Boltzmann MethodStream function-vorticityturbulentLarge-Eddy simulationImpinging jetNumerical simulation
相關次數:
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  • 下載下載:17
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本文主要在探討二維晶格波茲曼法結合大渦模型應用到三種不同的紊流場並提出了有系統與廣泛的研究評估。此三種數值模擬的範例分別為頂蓋驅動流場、背向階梯流場以及紊流噴流衝擊冷卻。紊流統御方程式使用流函數-渦度法配合大渦模型表示之,並使用晶格波茲曼法將統御方程式做離散,採用D2Q5的晶格波茲曼模型模擬速度場及溫度場。首先在前兩個範例,頂蓋驅動流與背向階梯流場的驗證中,與基準的實驗結果相比較之下,發現使用晶格波茲曼法結合大渦模擬,模擬結果是相當可靠與準確的。
最後,將晶格波茲曼法結合大渦模擬實際應用到噴流衝擊流場進行數值模擬與討論。首先對具有兩種熱邊界的紊流衝擊噴流作驗證,等溫邊界(Re=10200,H/W=2.6)與等熱通量邊界(Re=10000,H/W=2),對於紊流噴流衝擊流場與熱傳的數值預測值與文獻的數據作驗證。另外,對於暫態噴流衝擊亦進行分析,其研究範圍為300〈=Re〈=1500,2〈=H/W〈=4,0.5〈=q〈=1.5,工作流體為空氣(Pr=0.71)。數值結果顯示紐賽數隨著雷諾數的增加而增加,而改變了衝擊高度(H/W)會使得流場提早轉變為紊流,並且對紐賽數的分布有顯著的影響。在整個模擬的結果可以發現,晶格波茲曼法結合大渦模擬,模擬暫態之紊流流場具有相當的準確性,在未來紊流場的模擬應用上是很有前途的。

In this study, systematic and comprehensive research has been proposed to evaluate a two-dimensional Lattice Boltzmann Method (LBM) coupled with a Large Eddy Simulation (LES) model and has been applied to three different turbulent flow type. Three numerical examples, lid driven cavity, backward facing step flow and turbulent jet impingement cooling are employed. Turbulent governing equations using the stream function-vorticity method combined the Large-Eddy Simulation model is solved and discreted with Lattice Boltzmann model. A numerical scheme to solve the flow and the temperature fields using the D2Q5 is presented. In the first two examples, the LBM coupled with LES for predicting the lid driven cavity, and the backward facing step flow have been evaluated by comparing the numerical results with benchmark experimental data. The good agreement indicates the LBM coupled with LES is reliable and accurate.
Finally, a practical application of LBM coupled with LES for jet impingement is simulated and discussed. The validation of the turbulent impinging jet with two thermal boundary, constant temperature boundary (Re=10200,H/W=2.6) and constant flux (Re=10000,H/W=2) are studied first. The numerical predictions of turbulent jet impingement flow and heat transfer have been evaluated by comparing with the available data in the literature. In addition, the analysis of transient jet impingement is carried out for 300〈=Re〈=1500,2〈=H/W〈=4,0.5〈=q〈=1.5 . The fluid considered here is air (Pr=0.71). The results show that Nu increases with increasing jet Reynolds number, while the increase in parameters H/W to advance the time of flow field from the transition to turbulence and has a significant influence on the Nusselt number distribution. The results demonstrate that the present numerical model is a promising tool to investigate the solution of fluid flow and heat transfer for turbulent flow.

目錄
中文摘要……………………………………………………………………………I
英文摘要…………………………………………………………………………III
誌謝…………………………………………………………………………………V
目錄…………………………………………………………………………………VI
表目錄………………………………………………………………………………IX
圖目錄………………………………………………………………………………X
符號說明…………………………………………………………………………XIV
第一章 緒論………………………………………………………………………1
1-1 研究背景與動機…………………………………………………1
1-2 晶格波茲曼法(LBM)文獻回顧……………………………………3
1-3 大渦模擬(LES)文獻回顧…………………………………………4
1-4 衝擊噴流文獻回顧………………………………………………6
1-5 本文探討的主題與方法…………………………………………8
1-6 本文架構…………………………………………………………8
第二章 理論分析…………………………………………………………………9
2-1 統御方程式解析…………………………………………………9
2-2 晶格波茲曼方法(Lattice Boltzmann Method)……………10
2-3 大渦模擬(Large-Eddy Simulation)………………………11
2-4無因次化系統……………………………………………………16
2-5邊界條件…………………………………………………………19
2-6 Nusselt number計算…………………………………………24
第三章 數值方法…………………………………………………………………25
3-1晶格波茲曼方程式之推導………………………………………25
3-1-1渦度晶格波茲曼方程式之推導………………………25
3-1-2流線晶格波茲曼方程式之推導………………………28
3-1-3能量晶格波茲曼方程式之推導………………………31
3-2 收斂標準…………………………………………………………35
第四章 結果與討論………………………………………………………………36
4-1頂蓋驅動流場……………………………………………………37
4-2 背向階梯流場……………………………………………………38
4-3 衝擊噴流流場……………………………………………………39
4-3-1 衝擊噴流流動現象……………………………………40
4-3-2 衝擊噴流之固定壁面溫度邊界條件…………………41
4-3-3 衝擊噴流之固定壁面熱通量邊界條件………………44
第五章 結論與未來方向…………………………………………………………80
5-1 結論………………………………………………………………80
5-2 未來方向…………………………………………………………81
參考文獻……………………………………………………………………………82
自述…………………………………………………………………………………87


表目錄
表4-1 頂蓋驅動流場各漩渦中心點位置.........................47


圖目錄
圖2-1 晶格波茲曼模型示意圖………………………………………………11
圖2-2 頂蓋驅動流場示意圖…………………………………………………20
圖2-3 背向階梯流場示意圖…………………………………………………21
圖2-4 衝擊噴流流場示意圖…………………………………………………22
圖4-1 頂蓋驅動流場之流線驗證圖(Re = 400) ………………………………………………48
圖4-2 頂蓋驅動流場之流線驗證圖(Re = 1000)………………………………………………49
圖4-3 頂蓋驅動流場之流線驗證圖(Re = 5000)………………………………………………50
圖4-4 頂蓋驅動流場之流線驗證圖(Re = 10000)……………………………………………51
圖4-5 頂蓋驅動暫態流場之流線圖(Re = 20000)……………………………………………52
圖4-6 頂蓋驅動暫態流場之流線圖(Re = 20000,t=100000)……………………53
圖4-7 頂蓋驅動暫態流場之流線圖(Re = 20000,t=200000)……………………54
圖4-8 頂蓋驅動暫態流場之流線圖(Re = 20000,t=300000)……………………54
圖4-9 頂蓋驅動暫態流場之流線圖(Re = 20000,t=400000)……………………54
圖4-10 頂蓋驅動暫態流場之流線圖(Re = 20000,t=500000)……………………55
圖4-11 頂蓋驅動紊流流場殘值收斂圖 (Re = 20000)……………………………………56
圖4-12 背向階梯流場之再接觸點驗證圖……………………………………57
圖4-13 背向階梯流場之流線圖(Re = 300)…………………………………………………………58
圖4-14 背向階梯流場之流線圖(Re = 800)…………………………………………………………58
圖4-15 背向階梯流場之流線圖(Re = 1500)………………………………………………………58
圖4-16 背向階梯紊流流場殘值收斂圖(Re = 2400)…………………………………………59
圖4-17 背向階梯暫態流場之流線圖(Re = 2400)………………………………………………60
圖4-18 衝擊噴流流場之流線圖(Re = 300)…………………………………………………………61
圖4-19 衝擊噴流流場之流線圖(Re = 800)…………………………………………………………62
圖4-20 衝擊噴流流場之流線圖(Re = 1500)………………………………………………………63
圖4-21 衝擊噴流紊流流場殘值收斂圖 (Re = 10200)……………………………………64
圖4-22 衝擊噴流紊流溫度場殘值收斂圖 (Re = 10200)………………………………64
圖4-23 衝擊噴流等溫壁面條件之網格獨立測試圖
(H/W = 2.6, Re = 10200)………………………………………………………………………65
圖4-24 衝擊噴流流場等溫壁面條件之溫度分布圖(Re = 300)……………………66
圖4-25 衝擊噴流流場等溫壁面條件之溫度分布圖(Re = 800)……………………67
圖4-26 衝擊噴流流場等溫壁面條件之溫度分布圖(Re = 1500)…………………68
圖4-27 衝擊噴流流場等溫壁面條件之紐賽數分布圖(Re = 300)………………69
圖4-28 衝擊噴流流場等溫壁面條件之紐賽數分布圖(Re = 800)………………69
圖4-29 衝擊噴流流場等溫壁面條件之紐賽數分布圖(Re = 1500)……………70
圖4-30 紊流衝擊噴流流線圖及等溫壁面條件之溫度分布圖
(H/W = 2,Re = 10000)……………………………………………………………………………71
圖4-31 衝擊噴流等熱通量壁面條件之紐賽數驗證圖
(H/W = 2,Re = 10000)……………………………………………………………………………72
圖4-32 衝擊噴流流場等熱通量壁面條件之溫度分布圖
(Re=300,q=1.0 )……………………………………………………………………………………………73
圖4-33 衝擊噴流流場等熱通量壁面條件之溫度分布圖
(Re=800,q=1.0)………………………………………………………………………………………………74
圖4-34 衝擊噴流流場等熱通量壁面條件之溫度分布圖
(Re=1500,q=1.0)……………………………………………………………………………………………75
圖4-35 衝擊噴流流場等熱通量壁面條件之溫度分布圖
(H/W=3,Re=800,q=0.5)………………………………………………………………………………76
圖4-36 衝擊噴流流場等熱通量壁面條件之溫度分布圖
(H/W=3,Re=800,q=1.0)………………………………………………………………………………76
圖4-37 衝擊噴流流場等熱通量壁面條件之溫度分布圖
(H/W=3,Re=800,q=1.5)………………………………………………………………………………76
圖4-38 衝擊噴流流場等熱通量壁面條件之紐賽數分布圖
(Re=300,q=1.0)……………………………………………………………………………………………77
圖4-39 衝擊噴流流場等熱通量壁面條件之紐賽數分布圖
(Re=800,q=1.0 )…………………………………………………………………………………………77
圖4-40 衝擊噴流流場等熱通量壁面條件之紐賽數分布圖
(Re=1500,q=1.0 )………………………………………………………………………………………78
圖4-41 紊流衝擊噴流流線圖及等熱通量壁面條件之溫度分布圖
(H/W=2,Re=10000,q=1.0)………………………………………………………………………79
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