Numerical Study of Natural Unsteadiness Using Wall-Distance-Free Turbulence Models

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Title:	Numerical Study of Natural Unsteadiness Using Wall-Distance-Free Turbulence Models
Authors:	楊一龍 Yang, Yi-Lung
Contributors:	機械工程學系 Mechanical Engineering
Keywords:	Stokes’ second problem;Strouhal number;wall-distance-free紊流模式 Stokes’ second problem;Strouhal number;wall-distance-free turbulence models
Date:	2008
Issue Date:	2014-06-27 02:30:29 (UTC+8)
Abstract:	本研究探討圓柱之自然週期分離之現象。研究首先Stokes 第二問題平板週期振動解析解做一維程式開發之驗證，以確認數值分析之空間與時間之精度。再以二維圓柱之穩態流動於圓柱雷諾數1.54時之流線以及圓柱雷諾數28.4時之對稱分離點位置與尾流長度與實驗結果做一確認。當圓柱雷諾數為280 其交替分離尾流為層流，疊代至25個週期時，數值結果將自動產生非對稱之現象，並在56個週期後達到完全之週期流場。若圓柱雷諾數為1000其交替分離尾流為紊流，則只需疊代2個週期，其數值結果即產生非對稱之現象，並在3 The periodic vortex shedding past a cylinder is presented. The program was validated by the solution of one-dimensional Stokes’ second problem first. Then, a two-dimensional steady flow through a cylinder at Reynolds number 1.54 was used to compare with t
Appears in Collections:	[Department of Mechanical Engineering] Journal Articles

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