教師資料查詢 | 類別: 期刊論文 | 教師: 牛仰堯 NIU, YANG-YAO (瀏覽個人網頁)

標題:Development of a Moving Artificial Compressibility Solver on Unified Coordinates
學年98
學期1
出版(發表)日期2009/11/01
作品名稱Development of a Moving Artificial Compressibility Solver on Unified Coordinates
作品名稱(其他語言)
著者Niu, Yang-Yao; Lin, Yi-Hsun; Hui, W. H.; Chang, Chien C.
單位淡江大學航空太空工程學系
出版者Chichester: John Wiley & Sons Ltd.
著錄名稱、卷期、頁數International Journal for Numerical Methods in Fluids 61(9), pp.1029-1052
摘要Based on the unified Eulerian and Lagrangian coordinate transformations, the unsteady incompressible Navier–Stokes equations with artificial compressibility effects are developed. As we know, the Eulerian coordinates cause excessive numerical diffusion across flow discontinuities, slip lines in particular. The Lagrangian coordinates, on the other hand, can resolve slip lines sharply but cause severe grid deformation, resulting in large errors and even breakdown of the computation. Recently, Hui et al. (J. Comput. Phys. 1999; 153:596–637) have introduced a unified coordinate system that moves with velocity hq, q being the velocity of the fluid particle. It includes the Eulerian system as a special case when h=0, and the Lagrangian when h=1, and was shown for the two-dimensional unsteady Euler equations of compressible flow to be superior than both Eulerian and Lagrangian systems. In the framework of unified coordinates, our work will derive the unsteady incompressible flow equations and moving geometry equations, when hq equals grid velocity in conservation form and is updated simultaneously during each time step. Thus, the accurate estimation of geometry conservation and controlling the grid velocity or the h value based on the unified approach can keep numerical stability and avoid computation breakdown caused by moving body or boundary layers (considered as slip lines in Lagrangian coordinates). Also, the existing high-resolution Riemann solver can be extended to discretize the current unified incompressible flow equations. Our benchmark tests including the lid-driven cavity flow and backward step flow, oscillating flat plat and pulsating stenotic tube are used to validate the computations. The results verify the accuracy and robustness of the unified artificial compressibility solver on the moving body simulation.
關鍵字unified coordinates; incompressible flow; moving body simulation; geometry conservation law; artificial compressibility fluid–structure interaction
語言英文
ISSN0271-2091
期刊性質國外
收錄於SCI;EI
產學合作
通訊作者Niu, Yang-Yao
審稿制度
國別英國
公開徵稿
出版型式紙本
相關連結
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