Analytical and Numerical Solution of Circular Flow where Backwater Occurs

• Main Authors: Tung-Fu Hsu, 許冬福
• Other Authors: Shih-Hong Wang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/83297006151997207194

碩士 === 淡江大學 === 水資源及環境工程學系碩士班 === 98 === At present when solves mighty current of calculation problems which unsteady circular flow, the major method is using the coverall software or the numerical methods which be used by the momentum equation in the unsteady open channel flow in the inertia item to be ignored, and make the equation linearization, and the results is almost the same to complete dynamic wave model . But therefore in the computational process, because of its abbreviation inertia item, utilizes in the circular channel or the downstream which the backwater occurred. It often makes a little difference with the actual situation, and is not enough to satisfy project of engineering, therefore the present paper use the preliminary linear analytical solution and the one dimension Saint-Venant equation with numerical solution does by the circular flow compares. On the other way, regarding that downstream boundary condition with backwater effect, as soon as whether between both to have bigger errors to do compares. By the results may know that the numerical solution has the counting error which bigger than the analytic solution, and then analytical solution is closer to genuine solution, and its computation and application is more convenience, therefore analytical solution may be understood that is simple ,economic, effectiveness, the accurate project use value.