Author(s): S. H. Kim; K. S. Lee; J. H. Lee
Linked Author(s):
Keywords: 3D Modeling; Spillway; VOF; Numerical Model; Hydraulic Model; Scale Effect
Abstract: Scaled hydraulic models have been used for replicating flow patterns in many natural flow systems and hydraulic structures. However, a hydraulic model has the shortcomings termed scale effects which increase in severity as the ratio of prototype to model size increases. In this research, a 3D numerical simulation of spillway was done using the volume of fluid (VOF) method for free surface modeling. A renormalization group (RNG) model was used as turbulence model, and finite volume method (FVM) with fractional area and volume representation (FAVOR) technique was used for the accurate representation of 3D hydraulic structure. A 3D solid modeling technique was also adopted for representing complex natural geometry and 3D spillway structure. Computation results were compared with experimental data or empirical formulas to verify the 3D numerical model. To determine how scale effects influence model results, numerical simulation on the series of scale models (10:1, 20:1, 40:1, 50:1) are used, whereby models of the same prototypes are built at different scales. The results showed good agreement with empirical formula in terms of stagedischarge relation. Scale models showed different discharge and velocity distribution. Discharge and velocity of large scale model has shown larger values than the small scale model. The research also suggests that information for economic model scale can be derived from the result of numerical simulation of the series of the scale models.
Year: 2003