A Three-Dimensional Inverse Geometry Problem in Estimating the Unknown Boundary Configurations

• Main Authors: Meng-Ting Chaing, 蔣孟廷
• Other Authors: Huang Cheng Hung
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/50580034683872134009

碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 95 === A three-dimensional inverse geometry problem (shape identification problem), which is very limited in the literatures, in determining the unknown irregular surface configurations by utilizing the conjugate gradient method (CGM) and a general purpose commercial code CFD-RC is successfully developed and examined in this study based on the simulated measured temperature distributions on the bottom surface by infrared thermography. The advantage of calling CFD-RC as a subroutine in the present inverse calculation lies in that its auto mesh function enables the handling of this moving boundary problem. Results obtained by using the technique of CGM to solve the inverse geometry problem are justified based on the numerical experiments. Three test cases are performed to test the validity of the present algorithm by using different types of surface shapes, initial guess and measurement errors. Results show that excellent estimations on the unknown surface geometry can be obtained with any arbitrary initial guesses.