Multigrid Approach in Irregular Boundary Field

• Main Authors: Lee, Charng-Ho, 李長和
• Other Authors: Lan Chin-Wu
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/80843740787725294141

碩士 === 國立中興大學 === 土木工程學系 === 84 === In this study,develop a numerical model,the first uses Body- fitted coordinate system，to transform the coordinate system of the flow field, irregular boundary geometric shape of physical space into regular bound- ary geometric shape of compuational space , Secondly,multigrid method combining with automatic adaptive mesh refinement technique , then is applied to the Two-dimension irregular boundary flow. The Governing equation uses Wave equation，the governing equation have been coordinates system transform mapping，then applied to the coo- rdinates of compuational space.Our approximation is based on the use of finite differences at each grid level.Multigrid approach requires a data structure that is simple enough to implement efficiently, yet flexible enouth to permit the very complicated patterns of local mesh refinement that would be generated by and adaptive mesh refinement strategy. The adaptive mesh refinement criterion is based on estimates of the first order derivative error. The models have been verified analytical solution of flow field ， then is applied to the Two-dimension irregular boundary flow，in order to obtain the simultae product.