Comparison of Empirical Weir Coefficients to 3D models for Spillway Rating Curves
Abstract
With the increased use of three-dimensional (3D) Computational Fluid Dynamic (CFD) models, it is important for individual engineers and the industry as a whole to develop an understanding of the relative accuracy of CFD models compared to results obtained by use of empirical weir coefficients. This study provides a comparison between two different weir flow rating curves: a rating curve developed using an empirical weir representation (i.e., discharge computed using a weir coefficient), and a rating curve developed using a CFD model. The results indicate differences generally less than 5 percent between flow rates computed in a CFD model and flow rates estimated by weir coefficients.
Comparison of Empirical Weir Coefficients to 3D models for Spillway Rating Curves
Portland, Oregon
With the increased use of three-dimensional (3D) Computational Fluid Dynamic (CFD) models, it is important for individual engineers and the industry as a whole to develop an understanding of the relative accuracy of CFD models compared to results obtained by use of empirical weir coefficients. This study provides a comparison between two different weir flow rating curves: a rating curve developed using an empirical weir representation (i.e., discharge computed using a weir coefficient), and a rating curve developed using a CFD model. The results indicate differences generally less than 5 percent between flow rates computed in a CFD model and flow rates estimated by weir coefficients.