دانلود مقاله Analysis of Two- Dimensional Flow over Standard Ogee Spillway Using RNG Turbulenc Model
سال انتشار: ۱۳۸۵
محل انتشار: هفتمین کنگره بین المللی مهندسی عمران
تعداد صفحات: ۷
Majid Sartaj – Asistance Professor
Mohammad K.Beirami – Assistant Professor
Akbar Fooladgar – Civil Eng. Dept. Isfahan University of Technology, Iran
In the analysis and design of hydraulic structures it is necessary to precisely determine all flow parameters . Flow analysis using laboratory experiments usually involves considerable time and cost requirements. Nowadays, availability of computational fluid dynamic (CFD) programs and powerful computers has resulted in increasing usage of numerical methods of flow over standard ogee spillway. Navier – Stockes equations and Reynolds Average Navier – Srockes (RANS) equations were used to analyze the flow over standard ogee spillway. To calculate Reynolds stresses, Renormalization Group Theory (RNG) k-e turbulence model was used. Flow was analyzed for different head values and flowrate andvelocity at different sections of spillway were calculated and compared with experimental results. Results showed that the numerical method could properly describe flow over the standard ogee spillway. Results obtained from analysis of flow have been presented in the form of non-dimensional values of the flowrate , depth and velocity for different heads and sections of the spillway . Comparison of results of numerical analysis for flowrate with results presented by Utah Water Research Laboratory (UWRL) showed good agreement for moderate to high heads. Comparison of computed velocity with URWL results showed good agreement for heads greater than one-third of the design head, but did not give accurate results for smaller heads.