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姓名 陳玉佳(Yu-Jian Cheng)  查詢紙本館藏   畢業系所 土木工程學系
論文名稱 以大渦紊流模式模擬不同流況對二維方柱尾流之影響
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摘要(中) 本研究亦結合數值模式與風洞實驗以相互驗證,其結果可使吾人對柱體尾流有定量之分析,進而增加對非均勻流中渦流逸散現象的瞭解,並可提供正確的升力和阻力係數供工程設計之用,以降低天然災害對工程設施的危害。計算結果顯示:(1) 當迫近流為均勻流時,流場呈上下對稱,但有剪力效應時,柱體上下方的流場會受到迫近流速度梯度的影響而有不對稱的現象,且剪力參數越大,不對稱現象越明顯;(2) 隨著迫近流的剪力參數愈大,柱體上下方渦峰值呈非線性的增加;(3) 剪力參數b值增加,史徹荷數St、阻力係數Cd及升力係數之均方根值CL¢有遞減的趨勢;(4) 當雷諾數Re>104,流場不再受雷諾數的影響,但史徹荷數因剪力參數增加而有些微下降的趨勢。
摘要(英) The wake formation behind a bluff body has been widely studied for over a century. However, most previous studies concentrated on flow conditions without side walls and with uniform velocity and low turbulence intensities. But some practical flow situations may involve objects located close to a wall and velocity distribution which are non-uniform. In this way, the bluff body is under the influence of a shear flow and proximity effect of a solid wall. This phenomenon has not been thoroughly studied.
This study employed Large Eddy Simulation to investigate the wake flow around a two-dimensional square cylinder placed in constant shear flows. The influences of velocity gradient and gap ratio on the vortex shedding, drag and lift coefficients were studied in this research. The experimental results revealed that the turbulence intensity, turbulent kinetic energy and vorticity all have asymmetric distribution in the near-wake region. Also, the difference between the upper and lower vorticity is larger than the upstream vorticity. Furthermore, the peak vorticity has a periodic variation, but decays as the downstream distance increases.
關鍵字(中) ★ 大渦紊流模式
★ 尾流
關鍵字(英)
論文目次 目錄
頁次
中文摘要 I
英文摘要 II
目錄 III
圖目錄 V
表目錄 IX
符號表 X
第一章 導論 1
1.1 前言 1
1.2 研究動機 1
1.3 大綱 2
第二章 文獻回顧 4
2.1 均勻流 5
2.2 非均勻流 6
2.2.1 邊界層流6
2.2.2 剪力流7
第三章 理論分析與數值方法 13
3.1 控制方程式13
3.2 大渦紊流模擬 (Large Eddy Simulation) 14
3.2.1 次網格模式 15
3.3 數值方法 17
3.3.1 有限體積法 17
3.3.2 MacCormack 預測修正算則 19
3.4 邊界條件 20
3.4.1均勻流、定剪力流 20
3.4.2邊界層流 21
3.5 網格的影響 22
第四章 結果與討論 28
4.1 模式驗證 28
4.2 剪力效應之影響 30
4.3 間隙比之影響33
4.4 雷諾數之影響 34
第五章 結論與建議 84
參考文獻 86
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指導教授 朱佳仁(Chia-Ren Chu) 審核日期 2000-7-12
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