Numerical study of turbulent flow in USBR VI stilling basin

Abstract The USBR VI stilling basin is one of the oldest basins designed to dissipate energy at outlet pipes. In this study, effect two parameters including Froude number (Fr) inlet flow and ratio width equivalent depth ( W / D ) on characteristics mean turbulent inside were investigated, numerically. Reynolds Averaged Navier–Stokes (RANS) equations solved with Re-Normalization Group (RNG) k-ε turbulence model. Results showed that by increasing ⁄ , from 3.50 9.23, decreasing rate average velocity end inflow increases 80 97% maximum 40 87%. Also, dissipation in whole 4.5 times, moderately. Moreover, becomes four times. Therefore, design a based existing conditions, recommended increase as much possible until nearly 10.