Abstract
In this work, for flow with a hydraulic jump, the predictive capabilities of popular hydraulic models (HEC-RAS and WSPG) are validated with the published results from the three dimensional Computational Fluid Dynamics (CFD) model (OpenFOAM). The analysis is performed for flows with a Froude number of 6.125 and Reynolds number of 3.54 × 105. While the hydraulic models solve the one-dimensional energy equation, in the CFD model solution of the three dimensional Reynolds averaged Navier-Stokes (RANS) equations, with a turbulence model, is used. As the results indicate, although the hydraulic models can satisfactorily predict the location of the steady-state jump, the length of the hydraulic jump (i.e. distance from the toe of the jump to a location in tail water zone) and other jump characteristics are better simulated by the CFD model. The solution from hydraulic models is sensitive to the channel bottom roughness value.
Highlights
Hydraulic jump in open channels occurs when flow transits from supercritical to subcritical
The hydraulic models can satisfactorily predict the location of the steady-state jump, the length of the hydraulic jump and other jump characteristics are better simulated by the Computational Fluid Dynamics (CFD) model
While for both the HEC-River Analysis System (RAS) and Water Surface Pressure Gradient (WSPG) models, the jump forms across two adjacent nodes, the result of the CFD model is more in agreement with the reported experimental data, where the jump forms over an elongated reach
Summary
Hydraulic jump in open channels occurs when flow transits from supercritical to subcritical. Over the last three decades, numerical modeling of open channel flows with hydraulic jump has drawn the attention of many researchers. For surface water applications where the flow is predominantly in one direction, these models have been shown to provide a reasonably accurate simulation. These models can be applied for testing various “what if” flow scenarios and are not constrained by the required CPU time. We compare the performance characteristics of the two popular hydraulic models HEC-RAS and WSPG with the CFD OpenFOAM, for a flow situation with a hydraulic jump. The focus is on publications that used OpenFOAM for modeling hydraulic jump and other civil engineering applications. The depth profiles from the three models are analyzed and result from sensitivity analysis on channel bottom roughness coefficient illustrated
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