教師資料查詢 | 類別: 期刊論文 | 教師: 張正興 Cheng-hsin Chang (瀏覽個人網頁)

標題:Computational fluid dynamics simulation for tuned liquid column dampers in horizontal motion
學年100
學期1
出版(發表)日期2011/09/01
作品名稱Computational fluid dynamics simulation for tuned liquid column dampers in horizontal motion
作品名稱(其他語言)水平向TLCD(Tuned Liquid Column Dampers)性質之計算流體力學數值模擬
著者Chang, Cheng-hsin
單位淡江大學土木工程學系
出版者Daejeon: Techno Press
著錄名稱、卷期、頁數Wind and Structures 14(5), pp.435-447
摘要本文希望藉由數值模擬來率定不同移動頻率和不同阻塞比水平向TLCD受水平力移動後液面振幅高度,將模擬之結果與前人之實驗結果做比較,以找出最佳預測水平向TLCD液面振幅高度之數值模擬。以往率定TLCD之方法都是以實驗為主,實驗模型及量測儀器都是必要的花費,若能設計出高準確性之數值模式取代實驗,就能大幅降低研究成本,也能節省人力及研究時間。利用計算流體力學運用滑動網格與流體體積(VOF)兩種技術的結合,有效預測TLCD受水平力移動後液面擺動之振幅,並計算出不同移動頻率和不同阻塞比之水頭損失係數即找出TLCD之自然頻率。紊流模式採用層流模式及k-ε標準紊流模式開始測始,結果發現使用層流模式預測最大液面振幅較k-ε標準紊流模式準確。而在模擬中發現左右兩個垂直註分別之最大液面振幅有明顯誤差,將網格局部加密後發現誤差值變小。且在60~80秒內之平均值不會因此而改變。因此為了增加模擬效率,採用均一結構網格大小,而不採用局部網格加密。
由數值模擬結果與實驗結果比較得知,靠近共振頻率時之最大液面振幅誤差值較大,誤差百分比約為10%,其餘移動頻率百分比則為5%以下,而由數值模擬求得水頭損失係數與TLCD自然頻率之結果和實驗比較誤差不大,在可接受之容許範圍之內。;A computational Fluid Dynamics model is presented in this study for the simulation of the complex fluid flows with free surfaces inside the Tuned Liquid Column Dampers in horizontal motion. The characteristics of the fluid model of the TLCD in horizontal motion include the free surface of the multiphase flow and the horizontal moving frame. In this study, the time depend unsteady Standard k-ε turbulent model based on Navier-Stokes equations is chosen. The volume of fluid (VOF) method and sliding mesh technique are adopted to track the free surface of water inside the vertical columns of TLCD and treat the moving boundary of the walls of TLCD in horizontal motion. Several model solution parameters comprising different time steps, mesh sizes, convergence criteria and discretization schemes are examined to establish model parametric independency results. The simulation results are compared with the experimental data in the dimensionless amplitude of the water column in four different configured groups of TLCDs with four different orifice areas. The predicted natural frequencies and the head loss coefficient of TLCDs from CFD model are also compared with the experimental data. The predicted numerical results agree well with the available experimental data.
關鍵字CFD;TLCD;VOF;sliding mesh
語言英文
ISSN1226-6116;1598-6225
期刊性質國外
收錄於SCI;
產學合作
通訊作者Chang, Cheng-hsin
審稿制度
國別韓國
公開徵稿
出版型式,電子版,紙本
相關連結
Google+ 推薦功能,讓全世界都能看到您的推薦!