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:	低雷諾數紊流模式;完全發展圓管;迴流場分析 Low-Reynolds number turbulence models;fully developed pipe flow;recirculating flows
Date:	2006
Issue Date:	2014-06-27 02:45:26 (UTC+8)
Abstract:	本研究採用數種不同低雷諾數紊流模式進行分析比較。首先將紊流模式分成三類，第一類模式其阻尼函數採用牆壁距離做為變數，第二類模式其阻尼函數結合牆壁距離與紊流動能做為變數，第三類採用無牆壁距離之模式。先以完成全發展紊流圓管之速度、渦流剪應力、紊流動能以及紊流散逸率等分佈進行實驗與數值模式分析之比較，其中第一類模式以 Nagano-Kim之κ-ε紊流模式較佳，而第二類模式則以 Fan-Lakshminarayana-Barnett之κ-ε紊流模式較好，在第三類模式中以Wilcox之κ-ω紊流模式對照 Several low-Reynolds number turbulence models were examined. The turbulence models were divided into three groups. The first group uses wall distance in its damping function explicitly. The second group couples the wall distance with turbulent kinetic ene
Appears in Collections:	[Department of Mechanical Engineering] Seminar papers

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