Assessment of Various Low-Reynolds Number Turbulence Models for Recirculating Flow Computation

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Title:	Assessment of Various Low-Reynolds Number Turbulence Models for Recirculating Flow Computation
Authors:	楊一龍 Yang, Yi-Lung
Contributors:	機械工程學系 Mechanical Engineering
Keywords:	Strouhal 數;紊流模式 Strouhal number;turbulence models
Date:	2006
Issue Date:	2014-06-27 02:45:53 (UTC+8)
Abstract:	本研究探討圓柱之自然週期分離之現象。研究首先以低雷諾數下圓柱之流動以確認數值之精度。首先在圓柱雷諾數1.54下其數值分析之流線與實驗結果相當一致，其次在圓柱雷諾數28.4時，其圓柱之對稱分離點以及尾流長度皆與實驗結果吻合。在圓柱雷諾數1000下，其數值結果將自動形成非對稱之交替分離現象，當計算網格增加其所需產生週期交替尾流之疊代將增加，透過Arnone等人之模擬結果與目前分析之結果比對其圓柱尾流之流線週期演變相當一致。以較小之時間步階方能改善strouhal數之預測。採用 Wilcox之 The periodic vortex shedding past a cylinder is presented. The solution at low Reynolds number was used to check the accuracy of the program. At Re=1.54, the streamlines agree very well with experiment without any separation around the cylinder. At Re=28.
Appears in Collections:	[Department of Mechanical Engineering] Seminar papers

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